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<br />The provl.sl.on for adequat.e drainage in urban areas is necessary to <br />preserve and promote the general health, welfare, and economic well <br />being of the region. Thl; City of Greeley recognizes drainage as a <br />sub-system of all development; and, as such, the planning and <br />design of drainage facilities must be included in the development <br />process. <br /> <br />Planning and design of E:tormwater drainage sys.tems should not be <br />based on the premise that problems can be transferred from one <br />location to another. Colorado drainage law recognizes the <br />inequitabili ty of tran:3ferring the burden cof managing storm <br />drainage from one locat:ion or property to another. Liability <br />questions also arise when historic drainage patterns are altered. <br />The diversion of stormw.ater drainage from one basin to another <br />should be avoided unless specific and prudent reasons justify and <br />dictate such a transfer. <br /> <br />The subdivision process can significantly alte,r the historic or <br />natural drainage paths.. When these alterations result in a <br />subdi vision outfall syst.em that discharges bacle into the natural <br />drainageway at or near the historic location, then the alterations <br />(interbasin transfer) are generally acceptable. However, when the <br />subdivision outfall system does not return to the historic <br />drainageway, then interbasin transfer may result. This interbasin <br />transfer should be prevented since it violates a basic drainage law <br />principle by dischargin9 water into a subservient property in a <br />manner or quantity to do more harm than f.:>rmerly. If the <br />development significantly increases the drainage area tributary to <br />the subdivision outfall, then interbasin transfer into the property <br />has occurred, which also must be prevented. <br /> <br />In addition to planning fior the control of stOI1n~'ater runoff flows, <br />consideration for maintaining the quality of .th,~ urban stormwater <br />runoff resource should be included in the evalua.tion and design of <br />drainage facilities. Drainage facilities can fulfill other <br />purposes in conjunction with primary stormwCltElr considerations; <br />recreational, water qua.lity and open spacE; values should be <br />integrated where possible. Likewise, faci1i1:ies not designed <br />primarily for drainage, such as parks, open space areas, or other <br />natural resource areas, can frequently be desi9ned to utilize or <br />enhance some aspects of the stormwater runoff r.~source or provide <br />some drainage control benefits. <br /> <br />1.3 comprehensive Drainage Plan <br /> <br />The planning of drainage facilities must !be included in the <br />urbanization process. The first step is iCo include drainage <br />planning with all regional and local development master plans. <br />These plans shall address multiple purpose use of land for drainage <br />and open space. <br /> <br />1-2 <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />