01/11/18 - Laserfiche WebLink

Home

VI. ADDITIONAL ANALYSIS As a portion of this analysis, we reviewed City Comprehensive Plans for sanitary sewer and water main needs for the study area and completed a rough site grading review of the City park area. The following is a summary of results for the various analyses and reviews. Sanitary Sewer and Water Main The segment of trunk sanitary sewer main following the currently platted Ramsey Parkway does not follow the revised 2012 master plan alignment. This main may need to be realigned when this segment of Ramsey Parkway is constructed. An 8-inch gravity sanitary sewer main will be adequate to convey flows from the area. For this analysis, we included an allowance for 8-inch service lines to be extended to properties along the corridor. All existing streets include provisions to extend 8-inch watermain into the study area. Future roadway construction should include 8-inch watermain to complete looping in the study area. In the case that a high water user plans to develop within the project area, additional flow analysis should be performed to verify they will have adequate flow and pressure for their individual needs. Figure 6 in Appendix B depicts sanitary sewer and Figure 7 depicts the water main improvements within the study area. Storm Water Management Storm water management concepts were developed to maintain existing drainage patterns and preserve the conveyance and flood storage capacity of the existing site. Storm water runoff within the study area is planned to flow north from Sunwood Drive and west from Center Street NW to a large future regional pond proposed on the north side of Ramsey Parkway. The outlet for this regional pond will most likely to be extended along the future Yolite Street, where an existing 30-inch arch pipe has been extended into the study area from Sunwood Drive. In the interim condition, a swale should be constructed from the pond to the Sunwood Drive storm sewer pipe. The pipe should be uncovered and an apron installed until such time as the final pond outlet pipe is fully constructed. The existing hydraulic model was refined, and detail added, to allow for the analysis of storm water within the entire COR area. Preliminary storm water management conditions and requirements where then developed to determine the elevations required for building pads in the area. The sub -watersheds were modeled using future land use conditions to generally size the regional storm water basin. The basin was sized to ensure proposed discharge rates were equal to existing flow rates. The pond was also reviewed with respect to potential storm sewer depths and potential aesthetic park function. The pond footprint used in the analysis is as shown in the 2012 COR master plan. The normal water level was determined by using the elevation of the outlet pipe located near Sunwood Drive. Additional design parameters and regional storm water management planning should be further refined as the areas begin to develop. Figure 8 shows the general shape and location of the pond used in the analysis. Prepared by: Bolton & Menk, Inc. ADDITIONAL ANALYSIS Center Street Area Analysis' R16.114929 Page 6