Selected Water Quality Processes in Rivers and Streams - Hydro-Environmental Analysis: Freshwater Environments - page 139

Miles
94,182
61,748
48,957
42,752
39,120
35,301
34,556
27,522
22,691
22,559

Agriculture
Hydromodification
Unknown/unspecified
Habitat alteration
Natural/wildlife
Municipal discharges/sewage
Unspecified nonpoint source
Atmospheric deposition
Resource extraction
Urban runoff/stormwater

05
Percent of impaired stream miles affected

10 15 20 25 30 35 40 45

FIGURE 5.12 Listing of sources of impairments from the national water quality inventory: Report to
Congress 2004.

FIGURE 5.13 “What that mud in our rivers adds up to each year” cartoon by J.N. (Ding) Darling from the
1930s. (Courtesy of the Jay N. “Ding” Darling Wildlife Society.)