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<br />Page 10 <br /> <br />. <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 .ruleS.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 />d. . When less than 10 years of streamflow records are <br />available, the selected flood frequency flows shall be <br />calculated by comparison to similar watersheds and by <br />estimates using hydrologic models and precipitation <br />records. <br /> <br />. <br /> <br />3. Drainaoe.Basin Conditions. The hydrologic analysis shall <br />be based on drainage basin conditions that will exist in <br />the community at least 12 months following completion of <br />the report, exc.ept if future urbanization of a basin is <br />likely to occur, the hydrologic analysis shall be based on <br />foreseeable development in the basin. <br /> <br />/- """""" <br />. (j.-r-\<~,' <br />. ~: }I;J~ Fl ) <br />,V, <br /> <br />THE CODE OF COLORADO REGULATIONS ~~ <br /> <br />. <br /> <br />2 CCR 408.1 <br />