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Effects of Section 404 Permits on Wetlands in North Dakota

Table 2


Table 2. Comparisons of expected and observed wetland alterations from 70 discharges of fill material authorized under Section 404 of the Clean Water Act by nationwide permits (NWP) 13, 14, and 26 and by individual permits; prairie pothole region of North Dakota, 1987 - 1991. Expected alterations are based on figures in permit applications submitted to the U.S. Army Corps of Engineers. Mean-percent difference is the average difference between the expected and observed alterations. The parenthetical entries in the table field are the English units of measure that are used in the regulatory program of the U.S. Army Corps of Engineers.

AlterationsNWP 13NWP 14NWP 26 (<1 acre) [sic]NWP 26 (1-10 acres) [sic]Individual permits
VolumeAreaVolumeArea
n1519893151
Expected1,192 m2,057 m35,331 m31.6 ha7.0 ha110,188 m34.0 ha
(3,910 feet)(2,691 yd3)(6,972 yd3)(4.0 a)(17.3 a)(144,112 yd3)(9.8 a)
Observed1,191 m2,062 m35,249 m31.9 ha6.8 ha104,196 m34.0 ha
(3,905 feet)(2,697 yd3)(6,865 yd3)(4.7 a)(16.8 a)(136,275 yd3)(9.8 a)
Mean % difference4%4%147%5%9%

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