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County presents $3 million Delnut drainage planning effort; public asked to map local problems
Summary
County engineers described a $3,000,000 regional drainage planning effort to inventory culverts and model future rainfall and sea-level scenarios; officials asked residents to submit survey responses and drop pins on a public map to identify drainage problems.
County staff presented an overview of the Delnut Regional Drainage Infrastructure Plan, a planning-only effort funded at roughly $3,000,000 to inventory drainage assets (from small culverts to large bridges), develop basin-by-basin hydraulic models and prioritize projects based on vulnerability under future rainfall and sea-level rise scenarios.
The county engineer emphasized this is a data-collection and modeling grant, not construction funding. Staff said consultants (GHD) and airborne survey data from the North Coast Resource Partnership are being leveraged to create high‑resolution terrain data and a GIS of drainage assets. The project will model future scenarios out to a 75‑year horizon to help prioritize where maintenance or capital projects will be most useful.
Officials asked the public to contribute local knowledge via drainage.dnco.org, where residents can complete a survey or drop pins on a map indicating minor, moderate or severe problems. Supervisors and members of the public noted many drainage problems are resolved locally by culvert cleaning and maintenance and urged broad outreach to capture local knowledge.
What’s next: Staff will continue field data collection, model results, host regional in-person outreach meetings and produce prioritized project lists that could feed into the county’s capital improvement planning and future construction grant applications.
