Ronald Bog Basin Study Shoreline, Washington

Ronald Bog is a significant, highly-visible resource of the City of Shoreline that now provides the community an Early Warning System for flooding. Created by the headwaters of Thornton Creek, releasing runoff through an urban watershed to Lake Washington, the subbasin includes localized depressions that fill with stormwater runoff during flood events. Otak worked with City staff and stakeholders on watershed planning and developed a public involvement program that included newsletters, public workshops, and a citizen advisory group.

Flood Mitigation Meets Capital Improvement Program Prioritization

The flood water elevations in these depressions have continued to increase as the subbasin is urbanized, flooding 10 to 20 homes during a moderate storm. The project included capital improvement program (CIP) identification and prioritization. The resulting basin study detailed drainage problem analysis, drainage complaint analysis, hydrologic and hydraulic modeling, basin planning, surveying and GPS, drainage inventory and GIS, and preparation of plans, specifications, and estimates. Throughout the course of this research was significant community outreach and public involvement support.