WSP Water Solutions

System Design 

Metro Stormwater Engineering and Design Services Metropolitan Nashville Water Services | Nashville, Tennessee ■ Advanced hydraulic and hydrologic modeling ■ Design services for more than 800 stormwater drainage systems ■ Policy support Since 1986, WSP has served as the stormwater program consultant for Metro-Nashville Davidson County, Tennessee, delivering comprehensive modeling, design and program support. WSP has developed numerous hydrologic and hydraulic models using Hydraulic Engineering Center (HEC) River Analysis System (RAS), HEC Hydrologic Modeling System (HMS) and Storm Water Management Model (SWMM) to simulate flooding, assess infrastructure capacity and prioritize capital improvements. These models leverage Geographic Infromation System data, historical flood records and engineering assumptions to guide design solutions and inform city decision-making. In addition to modeling, WSP has provided design services for more than 800 stormwater drainage improvement projects, ranging from small-scale maintenance to large capital infrastructure. Services span preliminary engineering through full design and construction documentation. WSP has also supported Metro Nashville in facilitating the Storm Water Task Force, developing stormwater ordinances and organizing the overall program structure. This long term partnership reflects WSP’s commitment to resilient infrastructure and effective flood mitigation in one of Tennessee’s most urbanized and flood-prone regions.

Eastern Shore Drive Drainage Improvements – City of Virginia Beach Public Works City of Virginia Beach | Virginia Beach, Virginia ■ Pump station optimization ■ Canal widening and restoration ■ Automated tide gate installation This multi-phase flood protection initiative was designed to enhance resilience in a vulnerable coastal corridor. By addressing tidal surges, rainfall and sea level rise, the project integrates gray and green infrastructure to safeguard critical evacuation routes and infrastructure. Located along the low-lying Shore Drive corridor, the project includes two stormwater pump stations, automated tide gates, canal widening, elevated roadways, rain gardens and native plantings. Advanced Personal Computer Stormwater Management Model hydraulic modeling simulates rainfall and tidal events, including 3 feet of sea level rise, to optimize system performance. WSP’s value engineering eliminated a third pump station, saving the client nearly $15 million. Environmental enhancements include phosphorus removing hydrodynamic separators, channel restoration and water quality improvements. WSP ensured project compliance with National Environmental Policy Act, FEMA and Virginia stormwater regulations. Resilience measures included automated controls, standby power and hydraulic redundancies.

US 160 Pagosa Springs Corridor Vision Plan & Reconstruction Colorado Department of Transportation (CDOT) | Pagosa Springs, Colorado ■ Comprehensive stormwater system design ■ Inlet installation ■ ADA-compliant infrastructure As part of the US 160 Corridor Vision Plan and Reconstruction in Pagosa Springs, Colorado, WSP led a comprehensive redesign of approximately 1 mile of deteriorated highway through the historic downtown area. A key focus of the project was the design of its stormwater management system, addressing chronic drainage issues that impacted roadway safety and longevity. WSP’s hydraulic and roadway engineers collaborated to eliminate icy, flat spots and ponding by regrading surfaces, upsizing and installing additional inlets. The new storm sewer system integrates urban and rural drainage strategies, improving flow capacity and reducing surface water accumulation. These enhancements support long-term resilience and align with CDOT and the town’s adopted vision for sustainable infrastructure. The stormwater improvements were coordinated with ADA-compliant pedestrian upgrades, lane reconfiguration and landscape design.

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