Em4885 irrigation management practices to protect ground water

2 CHAPTER
FIGURE 2-3. Major Sources of Impairment for Rivers and Streams
Figure 2-4 summarizes results for estuaries. Here, 37% of the total area designated as estuary
was assessed and 54% of that area did not support beneficial uses. Another 13% was categorized
as threatened. Figures 2-5 and 2-6 show the major causes impairing the use and the sources of
contaminants in estuaries.
Not
Assessed
63%
Percent of
Total Square Miles
Major Sources of Impairm
for Rivers and Stream
Threatened
13%
Partially
Supporting
10%
Assessed
37%
FIGURE 2-4. Percent of Square Miles Assessed and Summary of Overall Support for Designated
Uses of Estuaries
10
36%
25%
20%
15%
Agriculture
Point Sources
Hydromodifica
Natural Condi
0 100
Percent of Assessed Size
Fully
Supporting
23%
Not
Supportin
54%
Overall Support
Designated Use