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<br />I <br />I <br />II' <br />I <br />I <br />I 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 /> <br />WCR 16 Culvert The capacity of the culvert prior to overtopping is 710 cfs. The 100- <br />year existing condition discharge in Tri-Area Drainageway at WCR 16 is 1,940 cfs. Flows will <br />overtop along the right bank upstream of the culvert and cross WCR 16 to the east. An improved <br />crossing structure could reduce the localized flooding problems at this location. <br />Main Street Frederick Culvert The capacity of the culvert prior to overtopping is 520 cfs. <br />The 100-year existing condition discharge in Tri-Area Drainageway at Main Street is 1,940 cfs. <br />Flows will spill along the right bank upstream of the culvert and flow through Frederick. An <br />improved crossing structure could significantly reduce the localized flooding problems at this <br />location. <br />State Highwa.,v 52fEighth Street Cu]vert~ The 100-year existing condition discharge in <br />Tri-Area Drainageway at State Highway 52 is 1,520 cfs. Flows will spread out east and west <br />along the road before overtopping. An improved crossing structure could reduce the localized <br />flooding problems at this location. <br /> <br />4.7 Summary of Future Conditions <br /> <br />4.7.1 Definition of Future Conditions <br /> <br />The future condition model of the Godding Hollow and Tri-Town Basins is based upon <br />projected land uses. In this master planning effort, the generation of future condition hydrology <br />is based on the projected land use as deflIled by the zoning and land use map. Furthermore, future <br />developments, according to the storm drainage criteria described previously, are required to <br />provide on-site detention limiting releases to either the 100-year existing condition runoff (for all <br />of Godding Hollow Basin and that portion of Tri- Town Basin north of WCRI8) or the 2-year <br />existing condition runoff (for that portion of the Tri-Town Basin south ofWCRI8). The results <br />of the future conditions model were utilized to develop and evaluate alternative strategies for <br />regional detention within the basin. <br />Based on the projected land uses, the hydrologic parameters which describe each basin <br />were modified. The revised parameters reflecting future conditions for both Godding Hollow and <br />Tri-Town Basins are presented in Table 4.5. <br /> <br />T:IOPENlCawe/dOllcowddOl jlfl 'Pt. wpd <br /> <br />4.19 <br /> <br />September 8, 1999 <br />