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<br />l.Y:.-_BASINS <br />The overall watershed basin for the study area was defined by local <br />toposraphy, accounting for effects of physical features, such as roa,ds and <br />canals. The area is subdivided into four major drainages, Cedar Creek <br />(56.29 sq. mi.), Montrose Arroyo (17.78 sq. mi.), Dry Cedar Creek (21.89 sq. mi.), <br />and South Canal (6.58 sq. mi.). The area directly tributary to the South Canal <br />has been identified since, the storm runoff is directly intercepted by the <br />canal. <br />Each of these basins has been broken into a number of smaller subbasins, <br />which have been defined so as to maintain reasonable uniformity of hydrologic <br />charccter within each (see Figure 9). The subbasins vay'y in size f)'om <br />apprcximately 22 to 1.25 square miles. (TherE! are also two subbasins which <br />are approximately 0.25 square miles in size but which are hydraulica:lly <br />isolated from the remainder.) <br />Drainage basin design points have been selected to more accurately define <br />hydr~ulic characteristics at areas of concern. Selected design points typically <br />inclJde roads or bridges, locations wl1ere watercourses combine, and critical <br />desi')n areas, such as the design point adjacent to the Montrose Water Treat- <br />ment Plant. <br />Drainage subbasins, in addition to bEdng defined to reflect uniformity <br />of character and accommodation of design points, account for the presence of <br />othel. physical features which affect local basin hydraul'ics, such as the <br />South Canal. <br />The accompanying Table 3 lists pertinent subbasin characteristics. <br /> <br />. <br /> <br />11 <br />