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<br />The headwaters of Dry Cedar Creek 1 ie approximately ten miles southeast <br />of Montrose at an elevation of approximately 9,400 feet. The stream flows <br /> <br />in a generally northwesterly direction to its confluence with the Uncompahgre <br /> <br />River one mile south of the City. Dry Cedar Creek has a catchment area of <br /> <br />approximately 21.9 square miles. <br /> <br />TABLE <br /> <br />MAJOR DRAINAGE BASIN ctlfllVlCTERISTICS <br /> <br />Stream <br /> <br />El eva t i on (Ft. ~1SL) Length Basin Area <br />'lTeadwa ters-- .CorlTluenc::e _(MiL (Sq. Mi. ) <br />--~._---- <br />9400 5700 24.8 56.3 <br />7500 5760 10.6 17.8 <br />9400 5800 14.3 21. 9 <br /> <br />Cedar Creek <br /> <br />r10ntrose Arroyo <br />Dry Cedar Creek <br /> <br />Ex.isting Drainage Systems <br /> <br />The location, size, and type of structure on Cedar' Creek and Montrose <br /> <br />Arroyo are shown in Figure 2. These crossings are genE,rally adequate for <br />discharges up to the 5-year frequency storm. As a result, large porUons <br />of the City of Montrose are susceptible to significant flooding during the <br />less frequent storms, particularly if blockage of the crossings occur. <br />Stl"eam crossing capacities are listed in Table 2. <br /> <br />Urban drainage in the City of Montrose relies prirnarfly on the exist- <br /> <br />ing street system for conveyance of loca-J ized runoff. The existing storm <br />sewer system .is not extensive and was not the result of long-range, area <br /> <br />wiele planning and is, therefore, not totally consistent throughout with <br /> <br />regard to hydrologic considerations. <br /> <br />Where storm sewering is provided in Montrose, the inlets are fre-. <br /> <br />quently located so as to be incapable of intercepting the drainage, In <br /> <br />addition, many of the inlet drain 1 ines are 8" diameter pipes which easily <br /> <br />clog with debris carried by the storm runoff. Numerous sections of the <br /> <br />- 10 - <br />