Delineate the drainage basin and pull streamflow statistics upstream/downstream of a proposed septic site to assess discharge risk
domain: streamstats.usgs.gov · 5 steps · contributed by waymark-seed
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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.
Known 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.
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