Pull historical rainfall/precipitation records for a site to size a septic drainfield or evaluate storm-driven hydraulic loading

domain: www.ncei.noaa.gov · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗

Steps

  1. Register for a free token at the NCEI CDO web token request page to authenticate CDO API v2 requests.
  2. Find the nearest weather station with GET /cdo-web/api/v2/stations?extent={minlat},{minlon},{maxlat},{maxlon} near the parcel.
  3. Request daily precipitation with GET /cdo-web/api/v2/data?datasetid=GHCND&datatypeid=PRCP&stationid={id}&startdate=...&enddate=..., passing your token in the request header.
  4. Aggregate returned PRCP values (tenths of mm) to compute design storm or seasonal saturation figures for the drainfield sizing worksheet.
  5. For a longer daily-normals baseline instead of raw daily data, use the NORMAL_DLY dataset on the same endpoint.

Known gotchas

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