3.0. SR 12-13-1993 - Laserfiche WebLink

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"1 ~ j "1 ul I I I . I I "1 ) ,..I j ,. J ,I 152-0901.d,,~ Adding Elk Park Center to the System Two separate options have been proposed by the developer of Elk Park Center for local drainage of the development. The first option, draining most of the site across TH 169, as shown on Exhibit 8, and the second option, a larger, single pond along the south side of the property, as shown on Exhibit 9. Both options involve discharging stormwater into the storm sewer along School Street and into the storm sewer system analyzed as part of this study. With either option, IO~ 15 cubic feet per second (cfs) of stormwater will be discharged into the School Street storm sewer, from a pond along the south side of the property. There is currently a 21" pipe stubbed out to the north side of School Street near Freeport A venue where the Elk Park Center drainage outlet would connect into the existing system of pipe. Effect on Critical Points The effect of the Elk Park Center on the existing storm sewer system is not great in percentage of flow contributing to the total flow. However, because the existing system is already at capacity, even a small increase in the total flow volume will make the system all the more overloaded. In October of 1993, the City of Elk River authorized a feasibility study regarding the Main Street and Evans A venue intersection and possible solutions to the overloaded storm sewer system at this location. This was the same feasibility study that examined the need for an outlet from Wetland 171 W across TH 169 from the proposed Elk Park Center development. The feasibility study recommended a new storm sewer system, extending east from the Main Street and Evans Avenue intersection to an extension of the County 10 ditch along TH 169. Runoff from the area would flow into the storm sewer system at the low point of the intersection, east to the ditch, and finally south along TH 169 before passing through the railroad embankment near the Highway 169110 interchange, under TH 10, and into the Mississippi River. This proposed storm sewer system would eliminate the Main Street and Evans A venue intersection from the same system as Elk Park Center developers are proposing to connect to. Consequently, because the peak discharges flowing to the Main Street and Evans A venue intersection are so much greater than the discharges from Elk Park Center, the entire storm sewer network. including the other two critical points, would be greatly improved by redirecting flow at the Main Street and Evans A venue intersection. ~ 12- 230-152-10