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<br />p_10 <br /> <br />.Dsr <br /> <br />the drainage basin and adjacent basins shall be inventoried <br />and documented. <br /> <br />a. When at least 50 years of streamflow records are <br />available, a statistical analysis of the individual <br />streamflow record and/or a regional reg~ession analysis <br />of the data shall be made to determine the flood peaks <br />of selected recurrence intervals. <br /> <br />b. When from 25 to 50 years of streamflow records are <br />available, the hydrologic analysis shall include a <br />statistical analysis in accordance with rule 5.B.2.a <br />and a comparison with similar watersheds. <br /> <br />c. When from 10 to 24 years of streamflow records are <br />available, the hydrologic analysis shall include a <br />statistical analysis in accordance with 5.B.2.a. <br />comparisons with similar watersheds. and flood <br />estimates using hydrologic models and precipitation <br />records. <br /> <br />All drainage basin characteristics that affect the <br />rainfall-runoff relationship shall be documented. <br />including, but not limited to, delineation of basin and <br />subbasin boundaries, size, shape. length, slope, <br />general aspect, elevation extremes, time of <br />concentration, land use, and soil types and <br />compositions. <br /> <br />When actual precipitation records of major recorded <br />storm events are available from area weather stations. <br />such data shall be used in conjunction with rainfall <br />data. <br /> <br />L <br /> <br />d. When less than 10 years of streamflow records are <br />available, the selected flood frequency flows shall be <br />calculated by comoarison to similar watersheds and by <br />estimates using hydrologic models and precipitation <br />records. <br /> <br />3. Drainaoe Basin Conditions. The hydrologic analysis shall <br />be based on drainage basin conditions that will exist in <br />tne community at least 12 months following completion of <br />the report, except if future urbanization of a basin ;s <br />likely to occur, the hydrologic analysis shall be based on <br />foreseeable development in the basin. <br /> <br />-~- <br />/~,. ' <br />, -."' <br />../~\-;\': <br />9 ;;1':.9 ) <br />."'" -f/ i <br />'''='''/ <br />-.....-.,...."'T.. <br />\ \ <br />\,.:J, \ <br />V.'-..\ <br /> <br />2 CCR 408.1 <br /> <br />THE CODE OF COLORADO REGULATIONS <br />