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I I I I I I I I I I I I I I I I I I I ~ ~7". Of; (),., ~ f", ,_,' __ ,... " "_ There are many lakes and surface water bodies throughout the High Plains regi on whi ch are not ground water dependent 1 i ke the wetl ands in Nebraska. These lakes are shallow depressions usually in closed basins that collect and store stormwater runoff. Some of the deeper 1 akes or pl ayas hol d water throughout the year (USGS, 1980). The playas were formed where surface water collects and percolates downwards dissolving soluble material resulting in compaction of the sediment (Fenneman, 1931). Playas are prevalent throughout much of the Arkansas Ri ver Bas i n and the pandhandl e of Texas. In these areas, playas are above the regional ground water table. Thus, playas are not dependent on, nor would they be affected by a change in the ground water as would the lakes in the Sandhills of Nebraska (USGS, 1980). However, they may be affected indirectly as discussed under Biological Factors. BIOLOGICAL ENVIRONMENT General Potential impacts on the biological environment of the High Plains area are generally related to: o Surface water flow and wetlands reduction due to ground water drawdown or increased direct usage; and o Land use changes such as increased irrigated cropland, reversion to dryland farming, or conversion to noncultivated uses. Because the High Plains Region has a complex and diverse biological environ- ment, it is difficult to predict specific, quantitative changes. In addi- tion, the type and detail of' information on areas within the Region is not uni form. Because the area is so large, only the most significant features are described. Some features may be omitted due to lack of information and many will be mentioned only briefly. Where known, sources containing more detailed information will be referenced. 1-11