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<br />3 <br /> <br />But these are costly improvements. Moreover the depressed local <br />economy and the uncertainty of funding from State and Federal Government <br />sources has placed these large-scale improvements on some future agenda. <br />In the meantime. effective smaller-scale less costly solutions must be <br />developed to mitigate the impacts on the Ditch from: (a) very recent <br />development. (b) contemplated future development such as street improvements <br />in areas served by the Ditch. and (c) possible future annexations. <br /> <br />Evaluation For Near-Term Improvements <br /> <br />This report presents results from a system-wide evaluation of recent <br />and near-term storm runoff impacts on the Pioneer Drainage Ditch and <br />mitigation of these impacts. The evaluation includes: <br />An update of the baseline hydrology and hydraulics of the system <br />presented in Leaf and RCI (1983), <br />A determination of the increases in flow above baseline levels that <br />will result from future street and drainage improvements. potential <br />developments by the private sector. and future annexations, <br />A determination of the most cost-effective alternatives for <br />mitigating these impacts consistent with the Master Drainage Plan. <br />These alternatives include both preventive and structural controls <br />such as local ditch improvements. and both on-site and off-site <br />detention storage. <br /> <br />HYDROLOGY AND HYDRAULICS <br /> <br />Most of the technical information on the hydrology and hydraulics of <br />the Pioneer Drainage Ditch system is contained in Leaf and RCI (1983). <br />These data were used in preparing this report as well as updated estimates <br />of runoff volumes and peak flows for existing and future development <br />conditions, <br /> <br />Existing Conditions <br /> <br />The assumed watershed area which generates local storm runoff intercepted <br />by the Pioneer Ditch is shown in Figure 2. Five control nodes were <br />