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<br />I <br />I <br />I <br />I <br />II <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 />3. State Highwa.y 52 Crossing. This improvement involves the placement of three <br />structures to convey stormwater runoff from Dacono across State Highway 52. <br />These structures include two 4'H x JO'W RCBs, one 48-inch RCP and one 4'H x <br />8'W RCB. <br /> <br />5.2.16 Tri-Town Basin Reach T6: Railroad Embankment Regional Ponds <br /> <br />The improvements in this reach involve the preservation of two existing detention ponds. <br />These ponds are located east of the railroad embankment and south of WCR 24. For the northern <br />pond, 24 acre-feet of storage is required which will necessitate the acquisition of approximately <br />10 acres. The southern pond will require the acquisition of 12 acres of land which will preserve <br />16 acre-feet of detention storage. These improvements are presented in Figure 5.17. <br /> <br />5.2.17 Additional Considerations <br /> <br />As indicated previously, road crossings of several tributaries to the Godding Hollow and <br />Tri- Town Drainageways also exist. Several of these crossings lack the capacity to convey the peak <br />discharge from the 100-year storm event for existing conditions. In addition, several of the <br />crossings were noted to be experiencing potential sediment and debris problems that would tend <br />to reduce the conveyance capacity. As land development occurs within the basin, these crossing <br />structures will require improvements to meet the existing drainage criteria. Improvements to these <br />structures should consider the peak discharges conveyed through or over these crossings during <br />the JOO-year storm event. In addition, the capacity and stability of downstream conveyance <br />facilities should be considered. <br /> <br />5.3 Drainage Criteria <br /> <br />It is understood that land development within both basins will be dictated by the guidelines <br />and recommendations provided in this master planning document. The following information is <br />presented to guide development within the Godding Hollow and Tri-Town Basins. <br /> <br />· Land development in the Godding Hollow Basin will be required to limit the <br />stormwater runoff to the magnitude of the existing condition, lO-year and 100-year <br />flood events. <br /> <br />T:IOPENlCoweldOllcowe/dO/ln/ rpr.wpd <br /> <br />5.29 <br /> <br />September 8, 1999 <br />