WSP Water Solutions

Stormwater Planning 

Jackson Strategic Stormwater Program Plan

Topeka Stormwater and MS4 Program Support City of Topeka, Kansas Utilities Department | Topeka, Kansas ■ Floodplain program evaluation and recommendations ■ MS4 permit program evaluation, planning and implementation ■ Post-construction program development ■ Stormwater control measure design manual WSP provided stormwater program and floodplain management support to the City of Topeka, beginning with projects to examine flood elevations and extents in city waterways. We delivered updated flood elevation WSP also evaluated the City’s Phase 1 MS4 permit compliance program, identifying mandatory improvements to close compliance gaps and optional enhancements to reduce administrative burden, streamline activities and improve efficiency. Each recommendation included cost and resource implications, timelines aligned with permit deadlines and stormwater utility budgets. We interfaced with state and federal regulators on the City’s behalf. Implementation support included a stormwater management ordinance, the Stormwater Design Handbook, BMP Maintenance Manual, inspection checklists and forms. WSP also engaged elected officials and provided training for City staff and site designers, ensuring sustainable stormwater practices and regulatory compliance. maps and recommendations for improved floodplain and levee management.

Stormwater Design Manual Development & Resiliency Planning City of Mobile | Mobile, Alabama ■ Multi-volume design manual development ■ Stormwater mapping, resilience and management

Town of Jackson, Wyoming Public Works Department | Jackson, Wyoming

■ Stormwater program planning, development and implementation ■ Stormwater quality, quantity and flood management ■ Stakeholder outreach and engagement ■ Climate change adaptation Jackson, Wyoming, a resort town at the gateway to Grand Teton and Yellowstone National Parks, hosts 1.6 million visitors annually and has a population of about 10,500. Despite its popularity, the town faces typical stormwater challenges: limited staff, aging infrastructure, snowmelt and storage issues, climate change impacts, flooding, impaired streams, outdated ordinances and a stormwater program lacking direct funding. To address these issues, WSP is leading development of a comprehensive 10-year Strategic Stormwater Program Plan and supporting implementation. The plan covers: ■ Program level-of-service. ■ Stormwater system and natural waters analysis (mapping, monitoring, modeling, master planning). ■ Capital improvement project identification and prioritization. ■ Community education and outreach. ■ Water quality and quantity regulations with supporting program elements. ■ Municipal operations and pollution prevention/good housekeeping.

WSP developed a comprehensive Stormwater Design Manual under the Mobile Area Stormwater Mapping and Resiliency Planning initiative. Supported by a RESTORE Act grant from the Alabama Department of Conservation and Natural Resources, the project began with a Repetitive Loss Area (RLA) analysis using ArcGIS and field reconnaissance to identify flood-prone properties. WSP developed mitigation strategies and best practices for RLAs within Special Flood Hazard Areas, and supported outreach to impacted property owners. A preliminary conceptual design guidance manual was created to promote Low Impact Development and integrate stormwater design with local codes. WSP also delivered a virtual training session for Mobile-area designers. Phase 2 is underway, expanding the manual with three volumes: Traditional Water Quality Practices, Hydrology and Drainage, and Plant and Tree Guidance. These aim to enhance flood resilience and water quality through vegetation based solutions tailored to Mobile’s environment. The manual is being developed in collaboration with the City’s Engineering Department.

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