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<br />systems are normally those associated with convenience, aesthetics, etc. <br /> <br />and not normally with damage reduction, though in many areas, property <br />damage will occur even during small, frequent rainstorms. <br />The evaluation problem for minor projects must, for the time being, <br />remain one of setting standards and criteria, then finding acceptable, <br />minimum cost solutions for meeting the standards. This approach is the <br />one currently relied on in most environmental fields, including air and <br />water pollution control. <br />There are a number of questions which must be answered before a <br /> <br /> <br />rational approach can be taken to the problem of setting standards for <br /> <br /> <br />minor UDFC systems in a particular local area. Some of these are as <br /> <br /> <br />follows: <br /> <br />1, What is the cost function for citywide UDFC protection, <br /> <br /> <br />relating cost to design level? (Figure 11-5 illustrates <br /> <br /> <br />this function for a single drainage basin). <br /> <br /> <br />2. What is the conununity willingness and ability to pay for <br /> <br /> <br />UDFC systems, a resource allocation question. <br /> <br /> <br />3. What is the frequency of operation of systems of different <br /> <br /> <br />design levels as contrasted to the frequency of occurrence <br /> <br /> <br />of extreme events? (Figure 11-6) <br /> <br /> <br />4. What is the intensity of use of the streets and adjacent <br /> <br /> <br />land where UDFC will be provided and how necessary is <br /> <br /> <br />UDFC for adequate use? <br /> <br /> <br />5. Will the stormwater collected by the UDFC system eventually <br /> <br /> <br />have to be treated, and if so, is there a way to design <br /> <br /> <br />the system to fit into this projected need? <br /> <br />36 <br />