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2.04.7 Hydrology Description <br />The significance of spring discharges to maintaining streamflow is <br />nonexistent. The evapotranspiration demands of vegetation, small <br />cumulative discharge, and gain -loss data presented by Brooks (1982) <br />suggests that streams traversing the permit area are losing flow, and spring <br />discharge does not enhance the ephemeral nature of streamflow. The <br />significance of springs to maintaining the land use patterns of the area is <br />described in section 2.05.6(6), subsidence. Generally, colluvial springs are <br />marginally suitable and small discharges preclude any agricultural or aquatic <br />use. <br />Colluvial springs are typically characterized by total dissolved solids values <br />less than 1,000 mg /I and are differentiated from the bedrock water by lower <br />conductivity and TDS. The lower values suggest shorter residence time in <br />the regolith (refer to groundwater monitoring results). <br />The area of colluvial sediments are very limited in extent. None of the areas <br />can be classified as an alluvial valley floor as it does not meet the <br />requirements of irrigation, topographic, or geographic conditions. Except for <br />livestock and wildlife use of springs and ponds, there are no known uses of <br />groundwater in the permit and adjacent area. <br />Riparian vegetation occurs near the seeps in the colluvial material. A few <br />willows, sedges, grasses and other riparian vegetation extend from the seeps <br />to the colluvial deposits. They are not extensive. <br />PR -12 2.04-39- 06/10 <br />A PPRav6D <br />11/16/1a <br />