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<br />VI. LAND USE <br />Land use data for the urbanized areCl of the study basin were obtained <br />from the Montrose City and County zoning maps. <br />The continuing development of Montrose over the next several years <br />wil I have little effect on major drainageway flow quantities. This is primarily <br />due to the fact that foreseeable development area is sm.all with respect to the <br />s i Zl~ of the overa 11 drainage bas in. <br />Future development will, however, affect the local flooding potential <br />and has been examined on a localized ba~is. <br />Existing development conditions have been utilized for determination of <br />f'Iol)d discharges. The character of this development has been defined by field <br />ins)ection and treated uniformly within the various zoning categories that <br />pro.juce s imil ar hydrol ogi cal character. Ci ty and County zoni ng maps have been <br />usej for this purpose. Proposed development which is considered imminent has <br />bee, included as "existing". <br />Land use determines basin imperviousness or infiltration potential. The <br />hyd ro 1 ogi c: storm runoff parameter associ ated with impervi ousness vari es with <br />the analysis method selected. Land use categories with associated impervious <br />panmeters are shown in Table 4 for a typical basin. The subbasin imperviousness <br />var i es' in proporti on to the 1 and use development i ntens ity. <br />Values representing imperviousness were selected in accordance with <br />the recommendati ons of the S.C.S. and standard practi ce. Fi gure 10 illustrates <br />lanj use for the study area. <br /> <br />14 <br />