This report is a compilation of runoff and storage data collected during the 1978 water year in the Mountain Creek basin. Mountain Creek drains the northeast corner of Johnson County, the northwest corner of Ellis County, the southeast corner of Tarrant County, and part of the southwest corner of Dallas County, Tex. The basin is 30 miles long and averages 10 miles in width. The total drainage area at the mouth is 304 square miles. Basin outflow for the 1978 water year was 3,520 acre-feet which is only 5% of the 18-year (1960-78) average of 76,070 acre-feet. Storage in Mountain Creek Lake showed a net loss of 890 acre-feet during the water year. Rainfall over the study area for the 1978 water year was about 24 inches, which is about 10 inches below the mean annual rainfall for the area. (USGS)
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