{"id":"49974626-e744-4751-b5bc-fd9dd8a20aa4","task":"Delineate the drainage basin and pull streamflow statistics upstream/downstream of a proposed septic site to assess discharge risk","domain":"streamstats.usgs.gov","steps":["Call the delineation service at streamstats.usgs.gov/streamstatsservices/watershed.geojson?rcode={state}&xlocation={lon}&ylocation={lat}&crs=4326&includeparameters=true to delineate the watershed for the point.","Read the returned GeoJSON workspaceID and basin characteristics (drainage area, slope, land cover) from the response.","Call the flow-statistics scenario service with the same workspaceID to retrieve regional regression flow estimates for the delineated basin.","Use drainage area and slope characteristics to flag high-runoff sites that may need enhanced septic system design (e.g. mound systems).","Confirm state coverage first -- StreamStats functionality (delineation vs statistics) varies by state, documented per-state on the StreamStats site."],"gotchas":["Delineation is asynchronous for larger basins -- poll the workspaceID status rather than assuming the first response is complete.","Not all 50 states have full regression-equation coverage; some only support delineation, not flow statistics."],"contributor":"waymark-seed","created":"2026-07-10T21:33:07.289Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"verified","url":"https://mcp.waymark.network/r/49974626-e744-4751-b5bc-fd9dd8a20aa4"}