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Previous reports on flooding in the Dallas area are listed in the references. Locations of Drainage Basins The studies involve the collection of precipitation, runoff, and flood-elevation data in seven drainage basins within the city of Dallas and in three drainage basins outside the city in Dallas County. Two of the seven study areas in Dallas have headwaters in rural areas outside the city limits, but the largest part of each drainage basin is within the city, The drainage basins within the city include Joes Creek, Bachman Branch, Turtle Creek, White Rock Creek, Coombs Creek, Cedar Creek, and Fivemile Creek. The locations of these seven study areas are shown on figure 1. The three drainage basins outside the city of Dallas are Tenmile Creek, Duck Creek, and South Mesquite Creek. The locations of these three study areas are also shown on figure 1. HYDROLOGIC INSTRUMENTATION A summary of hydrologic instrumentation in the Dallas metropol- itan area during 1971 is given in table 1, The locations of hydrologic- instrument installations in the drainage basins are shown as figures 2, 3, and 4. Flood-profile partial-record gages are used to obtain flood elevations along Joes Creek, Bachman Branch, White Rock Creek, Fivemile Creek, Tenmile Creek, Duck Creek, and South Mesquite Creek. The flood-profile stations are located principally on the main stem of each stream (usually on bridges at major road crossings); however, some stations are located on tributaries such as Cottonwood Creek and Floyd Branch which are tributary to White Rock Creek. The National Weather Service operates a rain gage at Love Field in west-central Dallas. DATA-COLLECTION METHODS Precipitation Total precipitation and rainfall intensities were determined from measurements at 39 recording rain gages distributed throughout the study area (figs. 2-4). Daily and monthly precipitation is also shown for the rain gage at Love Field. -2-