Northern Prairie Wildlife Research Center
| Table 4. Chronology of drainage by wetland class (Stewart and Kantrud 1971) for 173 drained wetlands in the Waubay study area, Day County, South Dakota, 1954-1993. | ||||||||||||
| Wetland Class |
Before 1954 | Between 1954-1968 | 1968-93 | |||||||||
| No. Drained |
(%)a | Hectares Drained |
(%)b | No. Drained |
(%) | Hectares Drained |
(%) | No. Drained |
(%) | Hectares Drained |
(%) | |
| I | 6 | 25.0 | 1.28 | 45.9 | 3 | 12.5 | 0.25 | 9.1 | 15 | 62.5 | 1.26 | 45.0 |
| II | 8 | 33.3 | 3.60 | 66.1 | 2 | 8.3 | 0.32 | 5.9 | 14 | 58.3 | 1.53 | 28.0 |
| III | 17 | 26.2 | 12.44 | 47.1 | 7 | 10.8 | 1.40 | 5.3 | 41 | 63.1 | 12.60 | 47.6 |
| IV | 2 | 40.0 | 3.48 | 61.8 | 1 | 20.0 | 0.13 | 2.2 | 2 | 40.0 | 2.03 | 36.0 |
| IIIt | 3 | 20.0 | 1.33 | 32.3 | 2 | 13.3 | 0.36 | 8.7 | 10 | 66.7 | 2.44 | 59.0 |
| T-2 | 3 | 27.3 | 1.23 | 54.0 | 4 | 36.4 | 0.43 | 19.0 | 4 | 36.4 | 0.62 | 27.0 |
| T-3 | 11 | 37.9 | 6.70 | 56.4 | 5 | 17.2 | 1.62 | 13.6 | 13 | 44.8 | 3.56 | 30.0 |
| T-4 | 0 | 0.0 | 0.00 | 0.0 | 0 | 0.0 | 0.00 | 0.0 | 0 | 0.0 | 0.00 | 0.0 |
| Total | 50 | 28.9 | 30.07 | 51.3 | 24 | 13.9 | 4.51 | 7.7 | 99 | 57.2 | 24.02 | 41.0 |
| a Percentage
of the total number of drained wetland basins in each
class that have been drained during each time period.
b Percentage of the total hectares that have been drained in each wetland class during each time period. |
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U.S. Department of the Interior |
U.S. Geological Survey
URL: http://www.npwrc.usgs.gov/resource/birds/waubay/tab4.htm
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