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<br />. <br /> <br />SUMMARY <br /> <br />Ob;ectives of Mapping <br /> <br />Definition of the drainage problem in the Denver region has been <br />difficult, if not impossible, because the small basins through which <br />storm and flood water flows had never been delineated. Thus, one <br />objective of Project REUSE, is to provide this aspect of the drainage <br />"model" in an analytical context related to programs to correct existing <br />problems and to prevent the development or worsening of other drainage <br />problems. The maps and supporting descriptive material in this document <br />provide the needed information. It is basic reference material, used to <br />complement other information, for drainage planning in the Denver region. <br /> <br />To identify which functions are within taking place, and to evaluate <br />present and potential flood problems with the Urban Drainage and Flood <br />Control District, it is necessary to define the physical characteristics <br />of the existing major drainageways, and to provide certain other related <br />data. Kronar reproducibles of standard U. S. Geological Survey 7-1/2 <br />minute quadrangle maps were selected to portray this information because <br />of their convenient scale and detail of existing physical features. The <br />Kronar copies of the USGS quadrangles were obtained from the latest avail- <br />able maps of the U. S. Geological Survey, varying in date of issue from <br />1965 to 1969. <br /> <br />. <br /> <br />Each of the 398 drainage basins within the UDFCD, which have a natural <br />tributary area greater than 1000 acres and up to 3000 acres, are identified <br />on the quadrangle maps in terms of physical and hydrologic features. The <br />size of basins is determined by the topography of the area, building density <br />along the drainageways and physical features such as roads, ditches, or rail <br />roads that can restrict or significantly affect runoff from the major (lOO-yr) <br />storm. In general, larger basin limits are used in rural areas, for larger <br />tributaries and where damage potential is considered to be low. Basins are <br />not divided into areas of less than 1000 acres for this study. Technical <br />criteria for the delineation of basins and development of parameters are <br />in accordance with the Urban Storm Drainage Criteria Manual.* <br /> <br />Basin and Channel Numbering System <br /> <br />To facilitate collection and correlation of drainage basin information, <br />and to provide for an orderly system of identifying, indexing, and retriev- <br />ing data, a numbering scheme for major drainage channels, tributary basins, <br />and subbasins was developed for Project REUSE. The coding system was coor- <br />dinated with the statewide identification system of the Irrigation Water <br />Divisions of the Colorado Department of Natural Resources, and the <br />federal numbering system for counties currently in use throughout the state <br />and nation. <br /> <br />* Denver Regional Council of Governments, Denver, Colorado 1969. <br /> <br />. <br /> <br />3 <br />