Consulting Services for North San Joaquin Area Local Floodplain Delineation

The San Joaquin County Department of Public Works is seeking a qualified consulting firm to perform detailed flood‑plain delineation for the north portion of the San Joaquin watershed. The work includes hydrologic‑hydraulic (H‑H) modeling, remapping historic flood‑hazard areas, field verification of key drainage infrastructure, and production of GIS‑based floodplain maps, along with recommendations for improving deficient drainage facilities. The consultant will also conduct three public‑outreach events and coordinate with County staff throughout the project. • Perform H‑H studies for 10‑, 25‑ and 100‑year events using open‑source software, and produce GIS shapefiles and raster outputs. • Conduct “master‑plan level” site inspections of significant drainage features; full inventories are not required. • Deliver technical reports, flood‑plain maps, and recommendations for remedial works; provide public‑outreach presentations and post all final GIS layers to the County website.