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<br />and is relatively expensive. It follows then that surface storage of <br />runoff is expensive and difficult to justify for single purpose use. <br />Conveyance of stonmwater by means of open channels is also expensive. <br />Conveying 'portions of stonmwater underground is even more expensive, <br />The need for open space within the urban settings provides some relief <br />from this dilemma in that joint use of the space is a viable possibility, <br />The final important factor is the overall division of responsibilities <br />among governmental units. While the division is not well defined, it very <br />closely approximates their respective financing capabilities, The result <br />of this institutional layerings is that the overall solution to the <br />problem involves coordination and implementation by many levels of <br />government, If one can accommodate these important facts then the <br />plan that is developed will obviously be good and, importantly, implement- <br />able. <br /> <br />Consider the following sample costs for storage and conveyance within <br />the urban setting, taken from (11): <br />STORAGE COSTS <br /> <br />Type of Storage <br />Open Reservoir (vacant land) <br />Closed Conduit (within pipes) <br />Mine Storage (underground <br />Natural Flood Plain (vacant land) <br /> <br />Cost in Dollars per Acre Foot <br /> <br />$ 3,000 <br /> <br />100,000 <br />. <br />8,000 <br /> <br />4,000 <br /> <br />21 <br />