... that watershed, w ≥ s denotesall watersheds upstream of shed s, including shed sitself, and areaw® Sdenotes the area in acres of allwatersheds between sheds w and s, including both w and ... areas, we utilized the WatershedBoundary Dataset, a multi-level spatial dataset for water- sheds created and maintained by the Natural ResourceConservationService(NRCS)andpublishedaspartofthe ... Environ Health Perspect 2000,108(Suppl 1):101-112.8. VanDerslice J: Drinking water infrastructure and environmentaldisparities: evidence and methodological considerations. Am J PublicHealth...