HWR Key Projects
Project Name: Route 3 Widening
Agency/Contract: VDOT – Design/Build
Project Tasks: (Rural) SWM/BMP Designs, ESC, HHA Models, and Scour
Duration: 2013 – 2016
Project Description:
The purpose of the project was to upgrade a 5.1-mile section of Route 3 from two lanes to a four-lane divided highway between Stevensburg and Lignum. In this final section of Route 3 in Culpeper County, it was widened to four lanes.
HWR designed Stormwater Management (SWM) facilities for the project. These facilities for both water quality and water quantity, were designed in accordance with Part IIC of the Virginia Stormwater Management Program (VSMP) Permit Regulations (9VAC25-870 et al). The project was deemed “grandfathered” for the use of the Technology-Based Methodology, and designated a Category 2 activity as per SWPA 12-01. HWR designed ten (10) Extended Detention Basins that provided treatment for a cumulative total of 28.26 acres of impervious area, exceeding the project requirements for SWM Water Quality.
These ten (10) Extended Detention Basins were also designed to attenuate post construction runoff in order to satisfy the DEQ/DCR Minimum Standard 19 requirements Outfall Channel Adequacy (Water Quantity) on the project, without any resulting impacts to the surrounding wetlands.
Wherever possible, a ditch was provided at each Basin Outfall to convey the discharge directly to the ultimate receiving channel without any impact to wetlands. In situations where either this connection cannot be made without an impact to wetlands, or no defined receiving channel exists in the approximate vicinity; then, the use of a Level Spreader was employed to return the discharge to an overland flow condition. Design of the Level Spreaders utilized is in accordance with the VDOT Special Provision for Level Spreaders S303J00-0708.
Project Name: Intersection of Route 608 @ Route 648
Agency/Contract: VDOT – Statewide Engineering Design On-Call
Project Tasks: (Rural) Drainage systems Designs, SWM/BMP Designs, and ESC
Duration: 2014 – 2015
Project Description:
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Project Name: Intersection of Route 608 @ Route 635
Agency/Contract: VDOT – Statewide Engineering Design On-Call
Project Tasks: (Rural) Drainage systems Designs, SWM/BMP Designs, and ESC
Duration: 2014 – 2015
Project Description:
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Project Name: I-81 Interchange @ Route 8
Agency/Contract: VDOT – Design/Bid – Statun District
Project Tasks: (Rural) Drainage systems Designs, SWM/BMP Designs, and ESC
Duration: 2014 – 2017
Project Description:
HWR completed design and analysis of roadway drainage, stormwater management and water quality systems, in addition to erosion and sediment control for this project. HWR completed conceptual drainage and stormwater management and water quality for nineteen (19) interchange alternatives and provided recommendations which was used to select the best three alternatives. HWR performed as the project’s hydrology, hydraulics, drainage and stormwater management engineering firm responsible for the hydrologic and hydraulic studies, rural drainage and stormwater management and water quality associated with the replacement of two bridges over Route 8 and associated roadway and interchanges modifications at the Town of Christiansburg and Montgomery County. HWR responsibilities included improvements to the existing drainage systems and design of the proposed drainage system, erosion and sediment control design, and storm water management and water quality design using the Runoff Reduction Method. Furthermore, HWR utilized innovative BMP facilities such as Bio-Retention basins and water quality grass swales for achieve water quality compliance
Project Name: Jones Branch Connector
Agency/Contract: VDOT / Fairfax County DOT
Project Tasks: (Urban) Drainage Systems Designs, SWM/BMP Designs, ESC, HHA Models, and Scour
Duration: 2014 – 2017
Project Description:
Jones Branch Connector project was located in the densely urbanized Tyson Corner area in Fairfax County. The project proposed to connect Jones Branch Road to US Route 123 using three bridges over the I-495 and Hot Lanes in addition to revising the existing Scotts Branch Road horizontal and vertical alignment. HWR was the primary hydraulic engineering firm responsible for the design of the urban roadway drainage systems and modeling, innovative stormwater management and water quality, river mechanics and hydraulic analysis. using.
HWR worked closely with the roadway design and structural design teams to eliminate several potential underground utilities’ conflicts and ensure proper drainage on the proposed bridges over I-495 and Hot lanes, in addition to the proposed widening of the existing ConSpan culvert.
HWR utilized InletSoft and PipeSoft computer programs to perform complex urban drainage designs and incorporated the existing drainage systems along with the proposed drainage systems. HWR’s innovative SWM/BMP measure (namely rainfall aerial interception) reduced the project-wide water quality requirements from 9.1 Ibs/yr to 6 Ibs/yr. Accordingly, the project-wide water quality requirement was satisfied through Nutrient Credit Purchase, which eliminated the cost of future maintenance.
HWR’s drainage, SWM, and water quality designs and calculations ensured compliance with stringent Northern Virginia and Fairfax County’s SWM and water quality regulations for this highly urbanized area. HWR worked in close coordination with Fairfax County and VDOT NOVA District to maximize runoff capture and treatment and secure the approval of the proposed SWM and water quality design.
HWR performed necessary watershed modeling, flood hazard analysis, and FEMA study for Scotts Run. The hydraulic modeling study incorporated proposed roadway widening and the proposed extension of the existing ConSpan Arch bridge. This analysis was conducted using HEC-RAS hydraulic model. during the study, HWR identified inaccuracies in the existing FEMA hydraulic models and developed a corrected hydraulic models for Scott Run. Fairfax County has now been utilizing HWR’s hydraulic models to update the existing floodplain and flood elevations.
Project Name: I-77/I-81 Auxiliary Lane
Agency/Contract: VDOT – Statewide Engineering Design On-Call
Project Tasks: (Rural) Drainage systems Designs, SWM/BMP Designs, and ESC
Duration: 2014 – 2016
Project Description:
The Project added an additional travel (auxiliary) lane and paved shoulders where I-77 North meets I-81 South, near Fort Chiswell in Wythe County. HWR was responsible for the design of the drainage and stormwater management systems associated with this rural/interstate roadway. This included analysis of, and proposed improvements to, the existing enclosed median drainage system. This was in addition to; design and development of a new proposed drainage system to handle the runoff generated by the added auxiliary lane and paved shoulder, to the outside. Although “grandfathered” under the Part IIC Requirements for water quality, significant effort was required to prove adequacy of the project’s numerous outfalls under water quantity requirements. This involved the use of specialized state-of-the-art GIS integrated hydrology and hydraulic computer programs such as Watershed Modeling System (WMS) to provide proof that the 1% LOA (Limit of Analysis) was met for each outfall location.
Project Name: Route 172 Wythe Creek Road
Agency/Contract: VDOT – Design/Bid – Hampton Roads District
Project Tasks: (Coastal) Drainage systems Design, SWM/BMP Designs, ESC, complex 2D HHA Models, and Scour
Duration: 2015 – 2019
Project Description:
HWR completed the PAC drainage, stormwater management and water quality, and tidal influenced river hydrodynamics modeling for this Wythe Creek Road project. It included widening the existing two-lane Wythe Creek Road to an undivided three-lanes through-way, curb and gutter, sidewalk, a multi-use path, and a 1,500 foot long replacement bridge over Brick Kiln Creek.
HWR conducted urban roadway drainage, stormwater management and water quality, erosion and sediment control, complex river mechanics and bridge hydraulics, and coastal scour depth studies. HWR completed the detailed design phase for all of its tasks including four two dimension (2D) hydrodynamic models for multiple alternative proposed bridge replacements with varying span lengths (300’ to 1,500’ long).
HWR utilized the Runoff Reduction Method to design SWM/BMP for this project and used innovative SWM and BMP designs such as Nutrient Credit purchase and the 1% Rule, in addition to pervious pavement along the multi-use sidewalks. These innovative measures resulted in eliminating the need for BMP basins, which minimized right of way acquisitions and eliminated future maintenance cost of BMP facilities for this project.
HWR developed the tidal influenced 2D hydrodynamic models for the existing conditions by integrating the available project survey data, GIS data from the Cities of Poquoson and Hampton, and bathometry data from the USGS seamless maps. HWR utilized available data from the NOAA gage station at the Bridge-Tunnel in Virginia Beach to develop the 100-year storm surge hydrographs which was used along with tidal stage data as the boundary conditions for the complex 2D hydrodynamic model and performed scour depth calculations and foundation stability study.
Project Name: Woodman Road Roundabout
Agency/Contract: Henrico County – Design/Bid
Project Tasks: (Urban) Drainage Systems Designs, SWM/BMPDesigns, ESC, and HHA Models
Duration: 2015 – 2019
Project Description:
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Project Name: Azalea Avenue Ped. & Signal Improvements
Agency/Contract: Henrico County – Roadway and Traffic Engineering Design On-Call
Project Tasks: (Urban) Drainage systems Designs, SWM/BMP Designs, and ESC
Duration: 2018 – 2020
Project Description:
The project, upon completion will provide sidewalks in an area with a significant amount of pedestrian activity. In addition to sidewalks, it will also provide crosswalks and pedestrian signals at two intersections where none currently exist. It will provide improved access to three GRTC bus stops, which will facilitate transit use.
Approximately ½ mile of sidewalk with pedestrian ramps on one side of Wilkinson Road between Kirkland Drive and Azalea Avenue will be installed. The proposed sidewalk will include curb and gutter on the west side of Richmond-Henrico Turnpike between Azalea Avenue and a point approximately 300 feet north of the intersection. HWR performed drainage and storm water management design for the project. HWR completed the roadway drainage curb and gutter systems and integrated it with the existing drainage systems. Additionally, HWR has completed the design of stormwater management and water quality requirements for the project using the Runoff Reduction Method, and ensured compliance with regulatory requirements through the use of nutrient credit purchase. HWR designs had zero impact to the project’s right of way and did not use stormwater management basins or ponds.
Project Name: Laburnum Avenue Sidewalk Improvements
Agency/Contract: Henrico County – Roadway and Traffic Engineering Design On-Call
Project Tasks: (Urban) Drainage systems Designs, SWM/BMP Designs, and ESC
Duration: 2018 – 2020
Project Description:
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Project Name: Nuckols Road Improvements, Phase II
Agency/Contract: Henrico County – Roadway and Traffic Engineering Design On-Call
Project Tasks: (Urban) Drainage systems Designs, SWM/BMP Designs, and ESC
Duration: 2018 – 2020
Project Description:
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Project Name: Route 122 over Goose Creek
Agency/Contract: VDOT – Design/Bid – Salem District
Project Tasks: (Rural) Drainage Systems Designs, SWM/BMPDesigns, ESC, HHA Models, and Scour
Duration: 2011 – 2019
Project Description:
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Project Name: Route 100 over NSRR & Route 11
Agency/Contract: VDOT – Design/Bid – Salem District
Project Tasks: (Rural) Drainage systems Designs, SWM/BMP Designs, and ESC
Duration: 2014 – 2018
Project Description:
The project was located in the Town of Dublin, Pulaski County, Virginia. The project included the replacement of the superstructure of the existing northbound Route 100 (Cleburne Boulevard) Bridge over Route 11 (Broad Street), and the super and substructure replacement of the northbound Route 100 Bridge over the Norfolk Southern Railroad (NSRR) and Route 689 (Peppers Ferry Road).
HWR was the project’s hydrology, hydraulics, drainage and stormwater management engineering firm responsible for the rural drainage and stormwater management and water quality and erosion and sediment control designs. HWR completed the PAC design and analysis for roadway drainage, stormwater management and water quality systems using MS-19 Method, in addition to erosion and sediment control. Stormwater Management comply with applicable VDOT and State DEQ/DCR regulatory requirements. Stormwater management for both water quality and water quantity were provided in accordance with the Virginia Stormwater Management Program (VSMP) Permit Regulations (4VAC50-60 et al). The project disturbed 1.63 acres of area and was “grandfathered” for the use of the Performance-Based Method for the calculation of Water Quality requirements, and MS-19 for the purposes of Outfall Adequacy analysis.
HWR utilized the Nutrient Credit purchase for this project to satisfy the water quality requirement without using conventional SWM basins. HWR completed the design plans and hydraulic report and calculations in compliance with MS-19 requirements for the project outfalls. HWR worked closely with the roadway and structure design teams to optimize the drainage and stormwater management solutions, which reduced project cost and eliminated future SWM maintenance.
Project Name: Route 46 over the Nottoway River Spillway
Agency/Contract: VDOT – Design/Bid – Richmond District
Project Tasks: (Rural) Drainage Systsems Design, SWM/BMP Designs, ESC, complex 2D HHA Models, and Scour
Duration: 2015 – 2021
Project Description:
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Project Name: Route 632 Fairground Road Roundabout
Agency/Contract: VDOT – Statewide Engineering Design On-Call
Project Tasks: (Rural) Drainage systems Designs, SWM/BMP Designs, and ESC
Duration: 2018 – 2020
Project Description:
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Project Name: Route 632 Fairground Road Extension
Agency/Contract: VDOT – Statewide Engineering Design On-Call
Project Tasks: (Rural) Drainage systems Designs, SWM/BMP Designs, and ESC
Duration: 2018 – 2020
Project Description:
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Project Name: I-77 over Cove Creek
Agency/Contract: VDOT – Statewide Structure and Bridge On-Call
Project Tasks: (Rural) Drainage systems Designs, SWM/BMP Designs, and ESC
Duration: 2018 – 2020
Project Description:
HWR was responsible for design of the rural/interstate drainage system associated with the replacement of the Northbound & Southbound I-77 bridges over Cove Creek, in Wythe County, Virginia. HWR’s task included the design of temporary drainage systems for five (5) SOC/MOT phases, to be transitioned into a final drainage design for the permanent grading conditions. HWR worked closely with the Prime Consultant (Moffat & Nichol) to deliver a joint Drainage Report & Computations to VDOT for final submission. Project was advanced on a hyper-accelerated schedule, moving from Notice-to-Proceed (NTP) to Advertisement Plans in a six (6) month timeframe.
Project Name: US Route 360 Roadway Widening at Swift Creek Reservoir
Agency/Contract: Chesterfield County – Design/Bid project
Project Tasks: (Urban) Drainage systems Design, SWM/BMP Designs, ESC, complex 2D HHA Models, and Scour
Duration: 2015 – 2019
Project Description:
HWR worked as a sub-consultant to JMT on the US Rte 360 Roadway Widening project. HWR provided comprehensive urban drainage system design, stormwater management and innovative water quality design. HWR developed and calibrated HEC-RAS models for the phased erosion and sediment control designs, and bridge and culvert hydraulic analysis for the proposed widening of the roadway and waterway crossings.
HWR developed innovative stormwater management and water quality solutions that eliminated the need to design conventional BMP basins in such highly urbanized environment. HWR utilized GIS-based solutions that:
— Integrated the existing and proposed drainage systems to optimize their conveyance capacities.
— Phased erosion and sediment control utilizing insulated turbidity curtain and super silt fences.
— Designed a longitudinal water quality grass swale that would be constructed in the roadway median of Route 360 and within the project’s right of way. This innovative approach:
– Eliminate the need for additional right of way acquisition to construct conventional BMP basins
– Provides sufficient water quality credits that exceeded the project’s water quality requirements.
— Developed HEC-RAS hydraulic model of Dry Creek and its confluence with Swift Creek Reservoir using the project’s field survey data. The hydraulic model shows that the proposed roadway and bridge widening will have no impact of the existing flood elevations.
Project Name: US Route 60 Roadway Widening, Stage I
Agency/Contract: Chesterfield County – Engineering Design Services On-Call
Project Tasks: (Urban) Drainage systems Design, SWM/BMP Designs, ESC, and HHA Models
Duration: 2015 – 2016
Project Description:
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Project Name: US Route 360 Eastbound Widening at Lonas Parkway
Agency/Contract: Chesterfield County – Engineering Design Services On-Call
Project Tasks: (Urban) Drainage systems Design, SWM/BMP Designs, and ESC
Duration: 2017 – 2020
Project Description:
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Project Name: Lee Hall Reservoir Dam Improvement Project, Stage I
Agency/Contract: City of New Port News
Project Tasks: (Tidal) Complex 2D HHA Models
Duration: 2015 – 2016
Project Description:
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Project Name: East Riverfront Transportation Improvement Project
Agency/Contract: City of Richmond, DPW
Project Tasks: (Urban) HHA Models, and Scour
Duration: 2015 – 2016
Project Description:
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Project Name: Hull Street Widening and Roadway Improvements
Agency/Contract: City of Richmond, DPW
Project Tasks: (Urban) Drainage Systems Designs, SWM/BMP Designs, ESC, HHA Models, and Scour
Duration: 2013 – 2020
Project Description:
The Hull Street Road improvement project widened the existing roadway width, add turning lanes, and added a 10’ wide multi-use path. The study included a detailed hydrology and hydraulic analysis for Pocosham Creek and Tributary to Pocosham Creek which involved developing HEC-RAS hydraulic models for both streams and perform scour hydraulic analysis.
HWR designed a detailed urban roadway curb and gutter drainage system that encompassed stormwater management (SWM) and water quality (BMP) design. Comprehensive HEC-RAS models were development to ensure zero backwater impact due to the widening.
HWR has carried out calculations for the project-wide water quality requirements, and confirmed compliance with the City’s and VSMP regulations. HWR worked closely with the City and design team to implement mill and overlay to the existing pavement to reduce water quality requirement for the project and reduce construction and maintenance cost. Following these design tasks, HWR worked phased erosion and sediment control estimation and prevention.
Project Name: Whitehead Road Culvert Replacement
Agency/Contract: City of Richmond, DPU On-Call
Project Tasks: (Urban) HHA Models, and Scour
Duration: 2019 – 2020
Project Description:
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Project Name: Chincoteague National Wildlife Refuge
Agency/Contract: EFL/FHWA
Project Tasks: (Coastal) Complex 2D HHA Models, and Scour, Sea Level Rise, Flood Resiliency
Duration: 2019
Project Description:
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Project Name: Lakeside Avenue Bridge Replacement
Agency/Contract: Henrico County, VA
Project Tasks: (Urban) GIS, Watershed Modeling, Complex HHA models and scour, FEMA Studies, No Rise Certification, Flood Resilliency
Duration: 2016 – 2020
Project Description:
HWR worked on the Lakeside Avenue Bridge Replacement project which included the replacement of the existing Lakeside Bridge over North Run. Additionally, the project included an extensive water resources and river hydraulic modeling task which extended beyond the tasks of replacing the existing bridge. The modeling task included the development of the HEC-RAS hydraulic models for 5.2 miles of North Run Upham Brook (from East Parham Road to Upham Brook confluence with the Chickahominy River). The hydraulic models included six bridges over Upham Brook, six bridges and an in-river gravity concrete and masonry dam over North Run. The Lakeside Dam is located immediately upstream of the Lakeside Avenue Bridge. HWR utilized HEC-RAS hydraulic models to update the existing FEMA Flood Study including the hydraulic models, floodplain and floodway limits, and re-establish flood elevations and flood maps for about 5.2 stream miles. Ultimately, HWR will prepare, submit, and secure approval of Flood Map Revisions (CLOMR and/or LOMR) from FEMA.
Floodplain Analysis: HWR developed hydraulic models to update the existing FEMA floodplain study which established updated floodplain limits and flood elevations. HWR integrated the existing County’s GIS data with the field surveyed river cross sections into a single digital terrain model which was used to delineate drainage areas and calculate flood discharges. HWR used HEC-HMS to update the hydrologic studies (flood discharges and hydrographs) and HEC-RAS to develop and update the hydraulic models for North Run and Upham Brook within the project limits. HWR incorporated the Lakeside Dam in the North Run hydraulic model and performed dam overflow analysis and scour depth calculations. The output flood elevations were exported to Watershed Modeling System (GIS based watershed modeling software, FHWA) to produce the flood maps for use in the LOMR and CLOMR applications. HWR will assist Henrico County to apply, submit, and secure approval of a LOMR for about 3 miles of North Run located between Parham Road and its confluence with Upham Brook.
Detailed Hydrologic and Hydraulic Analysis (H&HA) of the Bridge Replacement: HWR utilized data and hydraulic models from the Floodplain Analysis (HEC-HMS and HEC-RAS) to perform the necessary H&HA at the proposed Lakeside Avenue Bridge Replacement. The H&HA study and hydraulic models confirmed that the proposed bridge replacement will provide a 50-year flood protection (no roadway overtopping) and no impact to the existing 100-year flood elevation. Finally, HWR performed scour depth analysis and scour countermeasure design, in addition to finalize hydraulic report for the H&HA study.
Project Name: Oakleys Lane Road Realignment and Culvert Replacement
Agency/Contract: Henrico County, VA
Project Tasks: (Urban) Complex HHA models and scour, FEMA Studies, No Rise Certification, Flood Resilliency
Duration: 2016 – 2020
Project Description:
Oakleys Lane Roadway Realignment project included the design of the existing Oakleys Lane roadway on a new alignment with wider roadway and shoulders. It also includef the replacement of the existing undersized culvert with a 50 foot single span bridge. Oakleys Lane is located in a FEMA floodway, and is highly urbanized.
HWR completed the development of the necessary hydraulic models using HEC-RAS 5.0.5. HWR merged Henrico County’s GIS data with the updated field survey to develop the HEC-RAS models and calibrated the Modified Existing hydraulic model using FEMA’s flood stages, floodplain, and floodway maps. Furthermore, HWR completed the Post-Construction (Proposed) Conditions hydraulic model utilizing the proposed new Oakleys Lane alignment, roadway vertical profile, and proposed 50 foot bridge. HWR worked closely with Henrico County and the roadway and structure design teams to ensure that the Proposed Conditions will have a zero impact on the existing FEMA flood elevations.
Project Name: Richmond Henrico Turnpike VE Study
Agency/Contract: Henrico County, VA
Project Tasks: (Urban) VE and recommendation for Drainage Systems Design, SWM/BMP Facilities, and HHA models and scour
Duration: 2019
Project Description:
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Project Name: Wilkinson Road Bridge Replacement
Agency/Contract: Henrico County, VA
Project Tasks: (Urban) GIS, Watershed Modeling, Complex HHA models and scour, FEMA Studies, No Rise Certification, Flood Resilliency
Duration: 2015 – 2018
Project Description:
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Project Name: Woodman Road Extension
Agency/Contract: Henrico County, VA
Project Tasks: (Urban) Drainage Systems Designs, SWM/BMP Syatems and Facilities Designs, and ESC
Duration: 2016 – 2019
Project Description:
Woodman Road Extension project included engineering design of the new Woodman Roadway that would extend from Greenwood Road to the Dominion Power Transmission Line. The proposed roadway included a roundabout at the proposed intersection of Woodman Road Extension and Greenwood Road. In order to mitigate the anticipated future urbanization and increased traffic volume, HWR designed its drainage and stormwater systems (SWM) to accommodate future widening of the proposed roadway and roundabout intersection. HWR completed the urban roadway drainage, stormwater management and water quality compliance, erosion and sediment control, and river hydraulics tasks. The Runoff Reduction and Energy Balance Methods were used to finalize the SWM and water quality requirements and to ensure compliance with regulatory regulations. HWR utilized multiple innovative SWM and water quality designs where it merged the proposed curb and gutter drainage system with the existing drainage system to reduce project cost and construction schedule impact. Furthermore, HWR utilized level spreaders at project outfalls and purchased nutrient credit to achieve water quality and quantity compliance without the use of SWM basins or ponds.
HWR completed the necessary river mechanics and HEC-RAS hydraulic model for the proposed waterway crossings at Tributary 5 of Chickahominy River and its tributaries. HWR ensured that the proposed waterway crossing had a zero impact to the existing flood elevations.
Project Name: VRE Station and Commuter Lot
Agency/Contract: VDOT and Spotsylvania County, VA
Project Tasks: (Rural) Drainage Systems, SWM/BMP Syatems and Facilities Designs, and ESC
Duration: 2013 – 2016
Project Description:
HWR designed two Stormwater Management (SWM) and Water Quality (BMP) basins associated with the VRE Station Commuter Park & Ride Lot and Crossroads Roadway Improvements . The project includes constructing a new VRE station, commuter parking lot, and widening and adding turning lanes to the existing Crossroads Road at its intersection with US Route 17. The project is located within the State Hydrologic Code (HUC) 20801040103, and the receiving stream is Massaponax Creek. HWR worked closely with the roadway design and drainage teams to coordinate the design of the proposed two SWM/BMP basins which eliminated impacts to existing wetlands and acquisition of additional right of way.
HWR completed the design of the Pond #1 to meet the stormwater management and water quality requirements utilizing the Runoff Reduction and Energy Balance Method to satisfy the SWM and BMP requirements. A Wet Pond, Level 2 was designed in accordance with Virginia DCR Stormwater Management BMP clearinghouse, Stormwater Design Specification No. 14, March 1, 2011. The proposed Wet Pond, Level 2 Design, provides 75% phosphorous load removal. It provides the necessary water quality and quantity treatment for the proposed 1 additional 14 acres of impervious areas at the VRE Station and parking lot. It consists of a permanent pool of standing water, upper shelf wetland f receiving inflow from the forebay, an aquatic bench, a safety bench, and a pond aeration device.
Runoff from the proposed VRE Station and commuter parking lot is collected in a closed conduit system network, and is conveyed to the Pond #1 using a single 54” pipe which outfalls in Pond #1 forebay. The forebay area is graded to have a volume that is at least 15% of the total treatment volume (inclusive). The total volume of the proposed forebay is 12,600 cubic foot and the treatment volume of the Wet Pond (elevation 92.50’) is 78,209 cubic foot.
HWR designed Pond #2 which is an Extended Detention Basin (ED), Level 2. It was designed in accordance with Virginia DCR Stormwater Management BMP Clearinghouse, Stormwater Design Specification No. 15, March 1, 2011. The proposed ED, Level 2 Design, provides 35% phosphorous load removal per VDOT Drainage Manual. It consists of a micro deep pool, high and low marsh/wetland areas, and a safety/aquatic bench. The proposed site for the ED basin is within VDOT right of way (R/W), and the EB basin grading would not require additional R/W or drainage easements.
Runoff from the proposed roadway improvements is collected in a closed conduit system network (curb and gutter, inlets, and pipes), and is conveyed to Pond #2 using a single 30” pipe which outfalls in Pond #2 forebay. The forebay area is graded to have a volume that is at least 15% of the total treatment volume (inclusive). The total volume of the proposed forebay is 4,518 cubic foot and the treatment volume of the ED basin (elevation 78.50’) is 19,232 cubic foot.
Project Name: Lesner Bridge Replacement
Agency/Contract: City of Virginia Beach, VA
Project Tasks: (Coastal) GIS, Watershed Modeling, Complex 2D HHA models and scour, Hurricane & NorEaster Flooding, Sea Level Rise, Flood Resilliency
Duration: 2008 – 2016
Project Description:
The $96 million Lesner Bridge Replacement Project in Virginia Beach, VA, presented several technical challenges that were compounded by an accelerated design timetable and major revisions to the proposed bridge design. The proposed substructure units for this 1,550-foot long signature bridge at the Lynnhaven Inlet off the Chesapeake Bay are subjected to some of the fastest recorded tidal and storm surge currents in the Commonwealth. The project is located in FEMA flood Zones VE with frequent ship collisions with existing bridge piers. Furthermore, VDOT requested the simulation of the storm surge velocities and flood limits for the entire 45 square mile Lynnhaven River Basin. Finally, due to its location in a densely populated/urbanized area, technical and public presentations required inventive and comprehensible presentations.
HWR utilized several innovative techniques which led to the completion of these complex hydrodynamic analysis tasks within schedule. HWR developed a watershed model for the entire Lynnhaven River Basin (using WMS, FHWA) and combined its flooding conditions with anticipated 100-year and 500-year storm surge hydrographs. Furthermore, HWR developed the Nor’Easter hydrographs (using available NOAA gage station data) for the calibration and development of the hydrodynamic models.
HWR developed a two dimension hydrodynamic model using TUFLOW (SMS 10.1, FHWA) and incorporating sea level rise effect (USACE studies for Hampton Roads area). Rigorous calibration and verification of the Low-flow conditions using NOAA gauge data were used as the basis for high-flow storm surge generation and verification. The output data from the hydrodynamic models were used to calculate the scour depths at a coastal bridge using HEC-25 (FHWA) procedures. As an improved workflow an instantaneous revised piers scour depths were produced through automated output data transfers from the 2D hydrodynamic model to scour depth calculator (spreadsheet based calculator based on HEC-25, developed at HWR). Simultaneous scour depth updates based on substructure unit revisions kept pace with the foundation stability study even when one of these revisions included shifting the entire proposed bridge sixty (60) feet northward towards the Chesapeake Bay.
Project Name: Kilborn Court – Holly Road Culvert Replacement
Agency/Contract: City of Virginia Beach, VA
Project Tasks: (Tidal) Complex HHA models and scour, Hurricane & NorEaster Flooding, Sea Level Rise, Flood Resilliency
Duration: 2014 – 2015
Project Description:
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Project Name: Reedy Creek Culvert Replacement
Agency/Contract: City of Richmond, VA
Project Tasks: (Urban) GIS, Watershed Modeling, HHA Modeling and Scour, FEMA Study, No Rise Certification, Flood Resiliency
Duration: 2010 – 2013
Project Description:
The existing culvert was a corrugated metal pipes which were rusted through and their function as a multi-barrel culvert at Deter Road over Reedy Creek was failing. To keep Deter Rod open to traffic, the failing pipes at Reedy Creek must be replaced as soon as possible. Furthermore, siltation and debris accumulation have become a maintenance problem due to the poor alignment of the waterway crossing and the sharp bend in Reedy Creek channel.
Accordingly, a new alignment of the existing multi-barrel culvert was produced in coordination with the roadway and structure design team. HWR utilized HEC-RAS system to develop the necessary hydraulic models for the existing and proposed replacement culvert including modifications to the existing Deter Road to improve Reedy Creek flows and alleviate existing flooding.
Project Name: Fairground Road Roundabout
Agency/Contract: VDOT / Statewide Engineering Design Services On-Call Contracts
Project Tasks: (Rural) Drainage Systems Design, SWM/BMP Syatems and Facilities Designs, and ESC
Duration: 2018 – 2020
Project Description:
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Project Name: Fairground Road Extension
Agency/Contract: VDOT / Statewide Engineering Design Services On-Call Contracts
Project Tasks: (Rural) Drainage Systems Design, SWM/BMP Syatems and Facilities Designs, and ESC
Duration: 2018 – 2020
Project Description:
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Project Name: I-95 Southbound Auxiliary Lanes
Agency/Contract: VDOT / NOVA Engineering Support Services On-Call Contract
Project Tasks: (Urban) GIS, Watershed Modeling, Drainage Systsems Design, SWM/BMP Fcilities Design, and ESC
Duration: 2019 – 2020
Project Description:
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Project Name: I-66 Outside Beltway Projects GEC
Agency/Contract: VDOT
Project Tasks: (Urban) Review/Comments/Recommendations Drainage Systsems Designs, SWM/BMP Fcilities Designs, and HHA and Scour, FEMA Studies, and Flood Resillency
Duration: 2015 – 2022
Project Description:
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Project Name: I-495 Express Lane Northern Extension
Agency/Contract: VDOT / NOVA Engineering Support Services On-Call Contract
Project Tasks: (Urban) Review/Comments/Recommendations Drainage Systems Designs, SWM/BMP Facilities Designs, and HHA and Scour, FEMA Studies, and Flood Resiliency
Duration: 2019 – 2020
Project Description:
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Project Name: Route 221 Bridge Replacement over Mira Fork Branch
Agency/Contract: VDOT / Salem District Multiple Bridge On-Call Contract
Project Tasks: (Rural) GIS, Watershed Modeling, HHA Models, Bridge Scour, and Scour Countermeasure Designs
Duration: 2015 – 2018
Project Description:
This project was located in Roanoke County, VA, and included complete replacement of the existing bridge on Route 221 over Martins Creek and provided minimum tie-ins for the roadway on each side of the bridge. HWR completed the necessary hydrology and hydraulic analysis study (H&HA) using HEC-RAS hydraulic models and ensured compliance with VDOT requirements as described in Chapter 12 of VDOT Drainage Manual. The design storm for Route 221 roadway (classification is a rural minor arterial) is the 25-year storm event (4% exceedance probability), and HWR worked closely with the structure design team to ensure roadway protection during the 25-year flood event.
HWR utilized available FEMA data (peak discharges and flood stages from FIS and FIRM maps) in the development and calibration of the HEC-RAS hydraulic models. HWR merged the field survey data and additional overbank LiDAR data to create the digital terrain model, which was used to develop necessary X-Sections for HEC-RAS hydraulic models. HWR developed and calibrated the Existing Conditions hydraulic model, and used it to develop the Post-Construction (Proposed) hydraulic model using the proposed bridge replacement and approach slabs’ tie-ins. Furthermore, due to the proposed construction sequence which would include a temporary causeway, HWR developed a During-Construction hydraulic model which included the proposed causeway and portions of the existing and/or proposed bridge to ensure no adverse effect during the construction of the proposed bridge. Finally, the H&HA study showed that there were no adverse impact to the existing flood elevations and floodplain limits, in addition to calculation of the scour depth at the proposed substructure units and design of scour countermeasures, and completed the LD-293.
Project Name: Crab Creek TMDL Determination project
Agency/Contract: VDOT / Statewide MS4 Compliance Services
Project Tasks: (Rural) GIS, Watershed Modeling, Sediment and Pollutant/Nutrient Loads Numerical Modeling, TMDL Determination, MS4 Compliance
Duration: 2010 – 2012
Project Description:
Crab Creek watershed is located in Montgomery County, City of Blacksburg, and City of Christiansburg, VA. In thi project, the department of environmental quality (DEQ) completed TMDL reports for both creeks and identified pollutant loads and jurisdictional responsibilities and HWR completed the following tasks at all VDOT MS4 outfalls. HWR’s tasks provided the necessary calculations and report to VDOT:
- Performed Urban and rural roadway drainage, watershed modeling, stormwater discharge calculations, and determination of pollutant load quantities (TMDL) at regulatory VDOT outfalls.
- Identified and delineated drainage areas located within VDOT right of way draining into Stroubles Creek and Crab Creek TMDL waterway. This task was completed using GIS integrated data and as-built plans of various VDOT roadways located within the watersheds.
- Using the database of the various outfalls which were provided by VDOT’s Maintenance Division, HWR utilized GIS-integrated mapping to map VDOT outfalls within the Stroubles Creek and Crab Creek watershed and completed the watershed modeling.
- Utilizing output data from the watershed modeling, HWR calculated storm water discharge quantities and pollutant discharge quantities at VDOT MS4 regulatory outfalls.
- Completed several Numerical Analysis Modeling and Simulations of sediment load sources (located outside VDOT right of way) and sediment transport tracking (from its origins to regulatory VDOT MS4 outfalls) for particular locations within Stroubles Creek and Crab Creek using GSSHA (USACE), SWMM (EPA), and HSPF (USGS) modeling. These simulations segregated the sediment loads’ quantities, and identified sediment load sources that are located outside VDOT right of way.
- HWR developed characterization of the annual flow for VDOT’s outfalls to the Stroubles Creek and Crab Creek watersheds, which estimated the storm water discharge quantities for VDOT outfalls and the quantity of pollutant discharged into the Stroubles Creek and Crab Creek TMDL waterways.
Project Name: Stroubles Creek TMDL Determination project
Agency/Contract: VDOT / Statewide MS4 Compliance Services
Project Tasks: (Rural) GIS, Watershed Modeling, Sediment and Pollutant/Nutrient Loads Numerical Modeling, TMDL Determination, MS4 Compliance
Duration: 2010 – 2012
Project Description:
HWR completed a MS4 Investigation Protocol for VDOT to conduct an annual characterization that estimates the volume of stormwater discharged and the quantity of sediment discharged into the Stroubles Creek Sediment TMDL watershed. The MS4 investigation protocol developed by HWR takes into consideration future MS4 Program mitigation requirem`ents, and intrinsically generate additional information which could be utilized when VDOT revises its MS4 Program Plan and/or retrofits structural BMPs due to TMDL requirements. Furthermore, it contains an off-shoot process that stands ready to investigate several stormwater and water quality mitigation scenarios.
HWR utilized the TMDL report for Stroubles Creek (prepared by DEQ) and identified pollutant loads and jurisdictional responsibilities. In addition, HWR completed the following three tasks at US Route 460 and Merrimac Road right-of-way limits:
- Identify and develop an estimate of the area draining from within VDOT right of way to the Stroubles Creek TMDL waterway. While it did not include segregating neighboring upstream properties and/or delineating adjacent upstream properties’ drainage areas, HWR completed a 2D sediment transport model (using GSSHA software, USACE) for the portion of Stroubles Creek watershed located upstream of VDOT’s right of way. HWR was able to demonstrate to VDOT that the majority of pollutant were generated upstream of VDOT right of way, which facilitated presentations to DCR and DEQ regarding pollutant origin and transport to VDOT right of way.
- Using the outfall data provided by VDOT’s Maintenance Division, HWR mapped VDOT outfalls within the Stroubles Creek TMDL waterway based on existing database information and estimate storm water discharge quantities and pollutant discharge quantities for these outfalls.
- In lieu of site-specific sampling data, HWR developed a draft characterization of the annual flow for VDOT’s outfalls to the Stroubles Creek TMDL that estimates the storm water discharge quantities for these outfalls and the quantity of pollutant discharged into the Stroubles Creek TMDL waterway. Furthermore, HWR provided justification for the modeling data that were used, and a detailed report of the TMDL protocol procedures.
Project Name: Rappahannock River TMDL Determination project
Agency/Contract: VDOT / Statewide MS4 Compliance Services
Project Tasks: (Rural) GIS, Watershed Modeling, Sediment and Pollutant/Nutrient Loads Numerical Modeling, TMDL Determination, MS4 Compliance
Duration: 2010 – 2012
Project Description:
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Project Name: Route 624 Bridge Replacement over Blue Run
Agency/Contract: VDOT / Statewide Structure and Bridge Engineering Services On-Call Contract
Project Tasks: (Rural) GIS, Watershed Modeling, HHA Modeling and Bridge Scour, Scour Countermeasure Design, and Flood Resiliency
Duration: 2017 – 2019
Project Description:
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Project Name: Route 631 Bridge Replacement over Honeytown Creek
Agency/Contract: VDOT / Statewide Structure and Bridge Engineering Services On-Call Contract
Project Tasks: (Rural) GIS, Watershed Modeling, HHA Modeling and Bridge Scour, Scour Countermeasure Design, and Flood Resiliency
Duration: 2017 – 2019
Project Description:
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Project Name: Route 647 Bridge Replacement over East Branch Thumb Run
Agency/Contract: VDOT / Statewide Structure and Bridge Engineering Services On-Call Contract
Project Tasks: (Rural) GIS, Watershed Modeling, HHA Modeling and Bridge Scour, Scour Countermeasure Design, and Flood Resiliency
Duration: 2017 – 2019
Project Description:
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Project Name: Route 221 Bridge Replacement over Martins Creek
Agency/Contract: VDOT / Statewide Structure and Bridge Engineering Services On-Call Contract
Project Tasks: (Rural) GIS, Watershed Modeling, HHA Modeling and Bridge Scour, Scour Countermeasure Design, and Flood Resillency
Duration: 2015 – 2017
Project Description:
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Project Name: Route 644 Bridge Replacement over Big Otter Creek
Agency/Contract: VDOT / Statewide Structure and Bridge Engineering Services On-Call Contract
Project Tasks: (Rural) GIS, Watershed Modeling, HHA Modeling and Bridge Scour, Scour Countermeasure Design, and Flood Resiliency
Duration: 2016 – 2018
Project Description:
This project was located in Bedford County, VA, and included complete replacement of the existing single lane open pony truss bridge over Big Otter River and provided minimum tie-ins for the roadway on each side of the bridge. HWR completed the necessary hydrology and hydraulic analysis study (H&HA) using HEC-RAS hydraulic models and ensured compliance with VDOT requirements as described in Chapter 12 of VDOT Drainage Manual. The design storm for Route 221 roadway (classification is a rural minor arterial) is the 25-year storm event (4% exceedance probability), and HWR worked closely with the structure design team to ensure roadway protection during the 25-year flood event.
The bridge is located in a Zone A per FEMA’s FIRM map. HWR utilized WMS and HEC-HMS to delineate and drainage area and calculate the peak flood discharges. HWR merged the field survey data and additional overbank LiDAR data to create a digital terrain model, which was used in the development of a HEC-RAS hydraulic models. HWR developed the Existing Conditions hydraulic model and used it to develop other models for four proposed alternatives in order to evaluate the hydraulic performance of each alternative and reduce cost to the project. Upon completion of the hydraulic evaluation phase, HWR developed the Post-Construction (Proposed) hydraulic model using the preferred proposed bridge replacement and approach slabs’ tie-ins. HWR’s H&HA study showed that there were no adverse impact to the existing flood elevations and floodplain limits, in addition to calculation of the scour depth at the proposed substructure units and design of scour countermeasures, and completed the LD-293.
Project Name: I-95 Southbound Lane Bridge over Rappahannock River
Agency/Contract: VDOT, Design/Build
Project Tasks: (Rural) GIS, Watershed Modeling,River Mechanics and Hydraulic Modeling, Bridge Scour, Scour Countermeasure study, Infrastructure Assets Protection, Readiness, and Flood Resiliency
Duration: 2018 – 2019
Project Description:
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Project Name: Construction of Left Turn at Northbound and Southbound from Rt. 340 at the Intersection with Rt. 253/659
Agency/Contract: VDOT – Statewide Engineering Design On-Call
Project Tasks: (Rural) Drainage systems Designs, SWM/BMP Designs, and ESC
Duration: 2012 – 2014
Project Description:
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Project Name: Reconstruction of approximately one-half mile of Rte. 614 on new alignment
Agency/Contract: VDOT – Statewide Engineering Design On-Call
Project Tasks: (Rural) Drainage systems Designs, SWM/BMP Designs, ESC, River Mechanics and Hydraulic Models, Scour Calculations and Scour Countermeasures Design
Duration: 2011 – 2013
Project Description:
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Project Name: Route 661 Roadway Improvements
Agency/Contract: VDOT – Statewide Engineering Design On-Call
Project Tasks: (Rural) Drainage systems Designs, SWM/BMP Designs, and ESC
Duration: 2011 – 2012
Project Description:
Vehicula nibh nec elit gravida sed blandit nisl dapibus.Nam mauris sapien, cursus sed egestas ut, aliquam ut sapien. Nullam et nulla ante. Proin at condimentum magna. In placerat porta vehicula nibh nec elit gravida sed blandit nisl dapibus.Nam mauris sapien, cursus sed egestas ut, aliquam ut sapien. Nullam et nulla ante. Proin at condimentum magna. In placerat porta vehicula nibh nec elit gravida sed blandit nisl dapibus.Nam mauris sapien, cursus sed egestas ut, aliquam ut sapien. Nullam et nulla ante. Proin at condimentum magna. In placerat porta vehicula nibh nec elit gravida sed blandit nisl dapibus.Nam mauris sapien, cursus sed egestas ut, aliquam ut sapien. Nullam et nulla ante. sed enim enim.
Project Name: Route 61 Bridge Replacement over New River at Town of Narrows
Agency/Contract: VDOT – Design/Build
Project Tasks: (Rural) GIS, Watershed Modeling, Complex River Mechanics and Hydraulic Models, Scour Calculations and Scour Countermeasures Design, Infrastructure Assets Protection, Readiness, and Flood Resiliency
Duration: 2010 – 2013
Project Description:
The replacement of US Route 61 over the New River was located in a FEMA flood zone and floodway designated area. HWR completed hydrologic and hydraulic studies for the proposed bridge replacement located in the City of Narrows. HWR obtained a copy of FEMA’s HEC-2 hydraulic model and converted it to a HEC-RAS hydraulic model (Duplicate Effective). The Duplicate Effective hydraulic model was updated using integrated field survey and the HEC-RAS hydraulic model was calibrated as the Corrected Existing Conditions Hydraulic Model. Calibration of the hydraulic model utilized the existing FEMA 100-year flood elevations. HWR utilized the calibrate corrected Existing Conditions hydraulic model to develop the Post-Construction (Proposed) Conditions hydraulic model by integrating the proposed bridge design into the HEC-RAS hydraulic model and performed backwater impact and scour depth calculation studies in rock formation. HWR provided recommendations to the design team such that the proposed bridge would result in zero backwater impact. Furthermore, HWR utilized the geotechnical report and channel bed material analysis to complete the scour depth analysis in rock layer formation.
Deliverables:
- Conversion of the existing FEMA hydraulic models from HEC-2 to HEC-RAS format.
- Corrected, updated, and calibrated FEMA hydraulic models and floodplain maps.
- Hydrologic and Hydraulic Study for the proposed Main Street bridge replacement.
- Scour depth analysis and completion of the LD-293.
Project Name: Route 60 Bridge Replacement over Smith Creek at Town of Clifton Forge
Agency/Contract: VDOT – Design/Build
Project Tasks: (Rural) GIS, Watershed Modeling, Complex River Mechanics and Hydraulic Models, Channel Bed Armoring Study, Scour Calculations and Scour Countermeasures Design, Infrastructure Assets Protection, Readiness, and Flood Resiliency
Duration: 2010 – 2013
Project Description:
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Project Name: Route 28 Catlett Road Improvements and Replacement of Three Waterway Crossings
Agency/Contract: VDOT – Design/Bid – Culpepper District
Project Tasks: (Rural) GIS, Watershed Modeling, Complex River Mechanics and Hydraulic Models, FEMA Compliance Studies, Scour Calculations and Scour Countermeasures Design, Infrastructure Assets Protection, Readiness, and Flood Resiliency
Duration: 2014 – 2016
Project Description:
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Project Name: Route 708 Bridge Improvements over North Fork Hardware River
Agency/Contract: VDOT – Statewide Bridge Design On-Call
Project Tasks: (Rural) GIS, Watershed Modeling,River Mechanics and Hydraulic Modeling, Bridge Scour, Scour Countermeasure study, Infrastructure Assets Protection, Readiness, and Flood Resiliency
Duration: 2018 – 2019
Project Description:
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Project Name: I-64 South side Widening and High Rise Bridge
Agency/Contract: VDOT – Design/Build – Hampton Roads District
Project Tasks: (Tidal Urban) GIS, Watershed Modeling, Sea Level Rise, Complex Tidal Influenced River Mechanics and Hydraulic Models, FEMA Compliance Studies, Coastal Flooding and Infrastructure Assets Protection, Readiness, and Flood Resiliency. Modeling, Hurricanes, Scour Calculations and Scour Countermeasures Design, Storm water Management and Erosion and Sediment Control Review and Certification.
Duration: 2018 – 2020
Project Description:
HWR was the project-wide hydraulic engineering firm for this $480 million Design/Build project in the City of Chesapeake, VA, which includes widening I-64, improvements to existing interchanges, and construction of a new I-64 bridge over the Southern Branch Elizabeth River.
The following were the major tasks that HWR accomplished for this project:
- Project-wide stormwater management and water quality review, QA/QC, and regulatory compliance certifications (LD – 445C forms verifications and certifications).
- Project-wide erosion and sediment control review, QA/QC, and regulatory compliance certifications (LD – 445C forms verifications and certifications).
- Runoff Reduction (RR) and StormWater Management (SWM) at existing outfalls located at Gilmerton Canal, Hoyet Drive Culvert, and Hodges Creek to minimize existing flooding conditions. HWR performed these tasks using complex HEC-HMS (USACE), SWMM, and 2D hydrodynamic modeling of the relevant watersheds (WMS, FHWA) by combining the existing and proposed SWM basins and innovative RR measures.
- Development of the 2D Hurricane Storm Surge hydrodynamic Modeling (using SMS 12.2, FHWA) including the anticipated sea level rise for the year 2100 at the proposed I-64 High Rise Bridge. Furthermore, HWR utilized the output data from the 2D TUFLOW models to calculate pier scour at the existing and proposed I-64 bridges over the Southern Branch Elizabeth River (using HEC-25, FHWA).
- Development of the 2D Hurricane Surge hydrodynamic model using TUFLOW (SMS 12.2, FHWA) at the proposed MSE walls along Deep Creek. HWR utilized the output data to calculate the erosion and scour depths at the longitudinal MSE walls (HEC-23, FHWA), and provided detailed design of the erosion and scour countermeasures (HEC-20 and HEC-23, FHWA).
- The project is located in FEMA flood Zones AE, and the 2D hydrodynamic model extended to FEMA Zone VE to calibrate the hydrodynamic model. Tidal and storm surge data were obtained from available NOAA gage station at Sewells Point.
Project Name: I-64 South side Widening and High Rise Bridge, Gilmerton Canal Tide Gate Flood Protection
Agency/Contract: VDOT – Design/Build – Hampton Roads District
Project Tasks: (Tidal Urban) GIS, Watershed Modeling, Sea Level Rise, Complex Tidal Influenced River Mechanics and Hydraulic Models, FEMA Compliance Studies, Coastal Flooding, Hurricanes, Tide Gates and Infrastructure Assets Protection, Readiness, and Flood Resiliency.
Duration: 2018 – 2020
Project Description:
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Project Name: I-64 Hampton Roads Bridge Tunnel Expansion
Agency/Contract: VDOT – Hamnpton Roads District
Project Tasks: (Coastal Urban) GIS, Sea Level Rise, Coastal and Hurricane Flooding, Infrastructure Assets Protection, Readiness, Infrastructure Assets Protection, Readiness, and Flood Resillency
Duration: 2018 – 2019
Project Description:
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Project Name: Regional River Sever Storm (R2S2) Flood Warning System
Agency/Contract: VDOT – Drainage and River Mechanics On-Call Contract – Hampton Roads District
Project Tasks: (Rural) GIS, Watershed Modeling, Amplified Rainstorms and Climate Change, River Mechanics and Hydraulic Modeling, Floodplain Management, Infrastructure Assets Protection, Readiness, and Flood Resillency
Duration: 2011- 2013
Project Description:
The R2S2 was a mega watershed and hydrodynamic modeling systems that integrated multiple numerical analysis procedures and sophisticated watershed and hydrodynamic models to provide regional flood risk predictions during severe storm events. R2S2 was a GIS-based procedural framework that combined the metrological watershed modeling, surface water and river hydrodynamics, and regional rainfall distribution to predict flood risks at transportation bridges and waterway crossings.
HWR developed the R2S2 hydrodynamic model to assist VDOT to predict flood conditions at public transportation facilities (roadways and bridges) in advance of severe storm events. R2S2 was intended to providing early flood warning alerts at more than 498 bridges and culverts, in addition to flood inundation in five counties and nine towns. R2S2 was a GIS based regional flood risk prediction hydrodynamic model for the combined watersheds of Blackwater, Nottoway and Meherrin Rivers covering approximately 2,400 square miles. R2S2 utilized the state-of-the-art hydrodynamic technologies by integrating available regional GIS, metrological, and hydrological data and parameters to produce a two-dimension (2-D) flood risk prediction models and simulations in advance of anticipated severe storm events. R2S2 successfully predicted flood conditions at major rivers and tributaries in Hampton Roads District two days in advance of Hurricane Sandy (October 28, 2012) landfall.
R2S2 procedure combined available GIS data with location specific ground survey, regional rainfall distribution data, advanced watershed modeling techniques, and sophisticated 2-D hydrodynamic modeling to produce a GIS based temporal inundation maps at roadways and waterway crossing structures.
- Model Baseline Data (GIS platform)
- Topography and drainage way sections from digital USGS sources (10m DEM)
- Land Use and Land Cover digital maps, USGS and University of Virginia sources
- World Imagery, World Street Maps, World Topo Maps, Watershed Modeling System (WMS 9.0).
- Variable Inputs (GIS & field details)
- NEXRAD based rainfall (NOAA) or typical rainfall rate (NWS) input.
- Upstream hydrograph flows, HEC-HMS.
- Bridge deck and channel bottom elevations at 495 bridges and waterway crossings, field measurements, VDOT supplied data.
- As-built bridge plans for 118 bridges, VDOT.
- Stream gage data (USGS) for calibration procedures.
- Two-dimension hydrodynamic model, TUFLOW 11.07
- Output Data and Material Capabilities
- Mega Watershed Modeling
- GIS based regional flood risk and flood impact interactive map.
- Instantaneous interactive e-mail messaging to alert VDOT and Emergency personnel.
- Estimated date/time of anticipated flood impacts to hydraulic structures.
- Flow discharges, velocities, and flow direction throughout the watershed domain.
- Automated interaction with 1D hydraulic models such as HEC-RAS.
- Additional Application Capabilities
- Coastal and inner-coastal sea level rise flooding impacts
- Roadway drainage and stormwater management GIS-based database and upgrades.
- Estimated scour risks (washouts)
- Tidal ebb-flow-surge scour
- Advance investigation of proposed bridge geometries and locations (floodplain / scour)
- Sediment transport analysis and modeling
- Website output for emergency information dissemination.
Project Name: Route 633 Bridge Replacement over Bush River
Agency/Contract: VDOT – Drainage and River Mechanics On-Call Contract – Hampton Roads District
Project Tasks: (Rural) GIS, Watershed Modeling, River Mechanics and Hydraulic Modeling, Floodplain Management, Scour Studies and Scour Countermeasure Designs, Infrastructure Assets Protection, Readiness, and Flood Resillency
Duration: 2011 – 2012
Project Description:
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Project Name: US Route 360 Widening Project
Agency/Contract: Chesterfield County, VA – Drainage and Stormwater Management On-Call Contract
Project Tasks: (Rural) GIS, Stormwater Management and Water Quality, Erosion and Sediment Control Design
Duration: 2018 – 2020
Project Description:
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Project Name: Woodrow Wilson bridge Replacement
Agency/Contract: VDOT – Northern Virginia District / Design/Build GEC
Project Tasks: (Tidal Urban) GIS, Watershed Modeling, Complex Tidal Influenced River Mechanics and Hydraulic Models, FEMA Compliance Studies, Bridge Scour and Foundation Stability Studies, Scour Countermeasure Designs, Infrastructure Assets Protection, Readiness, and Flood Resillency. Stormwater Management, BMP Innovative Desaigns, and Water Quality Compliance
Duration: 2007 – 2014
Project Description:
GEC Project Hydraulic Studies Consultant for this $2.5 billion transportation project in Northern Virginia to replace the existing Woodrow Wilson Bridge (WWB) over the Potomac River and associated Interchanges along I-94/495 in Virginia and Maryland. Responsibilities included river mechanics and hydraulic model development and FEMA studies, project-wide urban drainage and watershed studies, project-wide stormwater and water quality evaluation and environmental impact and mitigation designs.
HWR’s responsibilities included:
- Watershed delineation and calculations of peak flood discharges which HWR used in the project’s FEMA flood studies, hydraulic numerical modeling (using HEC-RAS) and coordinating all efforts with FHWA, FEMA, VDOT, and SHA.
- Development, calibration and completion of the hydraulic models and based flood elevations for:
- Tidal influence hydraulic models of 4.5 miles of the Potomac River along the City of Alexandria, including the existing and proposed replacement 1.1 mile Woodrow Wilson Bridge.
- Performed the scour depth analysis and foundation stability studies for the proposed Woodrow Wilson Bridge over the Potomac River.
- Tidal influence hydraulic models of 2.5 miles of Cameron Run along the City of Alexandria, and Fairfax County, including more than 1,100 piers and bents and the four existing and proposed bridges, interchanges and flyovers crossings at Route 1, Telegraph Road, and I-95/495 bridges.
- Supervising and managing the Section Design Consultants’ (SDC) hydraulic studies and scour analysis studies, including hydraulic modeling, scour depth analysis at the proposed substructure units, erosion and sediment control, and Storm Water Management and water quality designs.
- Mr. Hassan served as a member of the GEC scour team responsible for scour depth analysis and foundation stability studies using one-, two-, and three-dimensional numerical models in addition to two physical models.
- Mr. Hassan successfully defended VDOT in 2007 and 2014 in litigation where he developed complex 2-D hydrodynamic models that simulated the flood condition and the impact of Woodrow Wilson project’s construction activities on the Cameron Run’s June 2006 extreme flood event. The hydrodynamic models showed negligible impact of the WWB construction activities. Accordingly, both litigation cases were dismissed by the presiding judge.
- Coordination and assistance to ongoing flood control studies and designs by the USACE, Fairfax County, and City of Alexandria along Cameron Run channel.
