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<br />Precipitation amounts in each drainage basin were compiled on <br />a daily basis. If the gage distribution was uneven, the totals were <br />weighted by the Thiessen polygon method. If the gages were about evenly <br />distributed, the totals were averaged arithmetically. <br /> <br />In this study, a digital computer was used to process the large <br />amounts of precipitation and runoff data. The equations used to deter- <br />mine weighted-mean precipitation for each drainage basin are given <br />in table 2, Precipitation at individual gages and weighted precipita- <br />tion in each drainage basin for selected storms are given in the section <br />"Compilation and Analysis of Data". <br /> <br />Runoff <br /> <br />Runoff data are based on discharge measurements and stage records <br />at nine continuous-record stations and 13 crest-stage partial-record <br />stations, Water-surface elevations are obtained at 115 flood-profile <br />locations, <br /> <br />Annual records of daily discharges at continuous-record gaging <br />stations, maximum discharge at crest-stage partial-record stations, <br />and documented peak elevations at flood-profile partial-record stations <br />are given in the section "Compilation and Analysis of Data". <br /> <br />SUMMARY OF DATA FOR THE 1971 WATER YEAR <br /> <br />Annual <br /> <br />Mean annual preclpltation at the National Weather Service sta- <br />tion at Love Field for the 3D-year period 1931-60 (calendar years) <br />is 34.55 inches, Weighted-mean rainfall, total runoff, and the ratio <br />of runoff to rainfall for selected drainage basins in the Dallas metro- <br />politan area are as follows: <br /> <br />-8- <br />