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A continuous-recording stream-gaging station \vi th a concrete low-water control is maintained on Wilbarger Creek. Records at this station began August 9, 1963. Pertinent station information and records of daily, monthly, and yearly runoff for the 1973 water year are included in the section "Compilation of Data". SUMMARY OF DATA FOR WALLER CREEK, 1973 WATER YEAR The weighted-mean rainfall in the study area upstream from 38th Street was 40.10 inches (1,019 mm), or 23 percent above the mean annual rainfall for Austin of 32.49 inches (825 mm). Mean daily discharge was 1.75 ft 3 /s (0.050 m 3 /s); annual runoff was 10.27 inches (261 mm), or 26 percent of rainfall. The weighted-mean rainfall in the study area upstream from 23d Street was 40.13 inches (1,019 mm), or 24 percent above the mean annual rainfall for Austin. Mean daily discharge was 3.77 ft 3 /s (0.107 m 3 /s); annual runoff was 12.38 inches (314 mm), or 31 percent of rainfall. A storm event is defined as a pe~od of rainfall separated by at least 6 hours from other rainfall. Storms a!re selected for detailed rainfallrunoff computations on the basis of 7~infall totals and distribution, the peak discharge produced from the ra}nfall, and the assurance of good rainfall and runoff records for the storm periods selected.

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