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Data Series 345

U.S. GEOLOGICAL SURVEY
Data Series 345

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Table 1. Summary of dominant study area features for the five study areas of the Nutrient Enrichment Effects on Stream Ecosystems Study of the National Water Quality Assessment Program, 2003–04.

[Study areas: ACFB/GAFL, Apalochicola-Chattahoochee-Flint River Basin and Georgia-Florida Coastal Plain Drainages; CCYK, Central Columbia Plateau-Yakima River Basin; CNBR, Central Nebraska Basins; PODL, Potomac River-Delmarva Peninsula; WHMI, White-Miami River Basin. Values in parentheses ( ) are the ranges (minimum and maximum. km2, square kilometer]

Dominant study area features Study areas
ACFB/GAFL CCYK CNBR PODL WHMI
Number of sites 29 29 28 27 30
Climate Humid plains Arid plains and plateaus Semi-humid plains Humid plains Semi-humid plains
Agricultural region Corn soybeans, peanuts, vegetables, pasture, cotton Wheat grains, alfalfa, potatoes, vegetables Corn, soybeans Corn, alfalfa, soybeans, pasture Corn, soybeans
EPA Level III Ecoregion Southeastern Plains Columbia Plateau Central Great Plains Middle Atlantic Coastal Plains Eastern Cornbelt Plains
Basin size (km2) 145.9
(54.7–300)
652.0
(3.2–6,378.8)
443.6
(49.6–1,759)
14.5
(4.4–41.1)
97.5
(36.6–340.1)
Percent agriculture 42.9
(7–76)
26.4
(0–95.4)
58.1
(16.9–97.0)
53.1
(9.9–89.5)
90.2
(75.5–98.4)

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