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I I I I I I I I I I I I I I I I I I I of conveyance and storage methods and system types. When a multipurpose strategy is adopted in a broad sense, it involves participation by both public and private interests. This, in turn, creates a need for overall supervision and a master plan for drainage. AN URBAN DRAINAGE STRATEGY SHOULD BE A MULTIPURPOSE, MULTIPLE MEANS EFFORT. 1. 2.6 Bas in Transfer Colorado drainage law recognizes the inequitability of transferring the burden on managing storm drainage from one location or property to another. Liability questions also arise when the historic drainage continuum is altered. The diversion of storm runoff from one basin to another should be avoided unless specific and prudent reasons justify and dictate such a transfer. Prior to selecting a solution, alternatives should be reviewed. Planning and design of storm water drainage systems should not be based on the premise that problems can be transferred from one location to another. The subdivision process can and will significantly alter the historic or natural drainage paths. When these alterations result in a subdivision outfall system that discharges back into the natural drainageway at or near the historic location, then the alterations (intra-basin transfer) are generally acceptable. However, when the subdivision outfall system does not return to the historic drainageway, then inter-basin transfer may result. This inter-basin transfer must be prevented since it violates a basic civil drainage law principle by discharging water onto a subservient property in a manner or quantity to do more harm than formerly. If the development significantly increases the drainage area tributary to the subdivision outfall, then inter-basin transfer into the property has occurred, which also must be prevented. THE POL! CY OF lliE CITY/COUNTY SHALL BE TO AVO I D INTER-BAS IN TRANSFER OF STORM DRAINAGE RUNOFF AND TO .fli#j~"'''''S.'.K-''Dft.U,ml!.I!:1IlI\TH WITHIN THE BASIN. HOWEVER, THE TRANSFER OF DRAINAGE FROM BASIN TO BASIN IS A VIABLE ALTERNATIVE IN CERTAIN INSTANCES AND WILL BE REVIEWED ON A CASE-BY- CASE BASIS. IN ALL CASES A SUITABLE OUTFALL SHALL BE PROVIDED. 1.3 Financial Responsibility A developer is generally required to pay for the drainage facilities serving new subdivisions or major urban development projects such as for shopping malls or business office complexes. The City/County have established a drainage board to administer a Subdivision Storm Drainage Fund. The Storm Drainage Fund in part pays for drainage improvements based on collection of a unit drainage fee from developers (see Chapter 3). 1-8