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<br />26 <br /> <br />1 <br />~ <br /> <br />Rum River Hills Golf Course <br />Page 2 of3 <br /> <br />Staff used the 2003 aerial topography as the basis for the pond. Relative elevations were <br />obtained at the pond, inlets and outlet of the existing pipe. The location of the pipe was <br />sketched on the plan using available land marks, a full survey was not performed. <br /> <br />City staff modeled the-pond using hydrology software which confirmed the field <br />observation that the full capacity of the pipe is not used except in extreme storm events <br />when the entire course is flooded. The model was also used to test possible solutions. One <br />solution that would not require much work is to remove the submerged pipe and 100 feet <br />of the outfall pipe and replace them with new pipes and a control box. The control box <br />would be 3 ft x 2ft and have channels in the sides for boards which could be used to <br />control the elevation of the ponds. The pipe to the pond and the outlet pipe would be <br />installed on the bottom of the box. The box would have a removable metal cover to allow <br />adjustment of the boards inside. The additional boards could be added to retain more water <br />in the ponds during dry periods, and removed quickly if a large rainfall occurs. The <br />elevation of ponds further east on the course is controlled by adding or removing boards. <br /> <br />These improvements have been discussed with the golf course maintenance staff and are <br />scheduled to be brought to the Golf Course Board. The proposed work should be <br />performed after the close of the golfing season. <br /> <br />The discussion in 2005 centered on whether or not water backing up on the golf course <br />was affecting the level in the pond adj acent to the residents. Review of the model indicates <br />this is not the case. The area north of 16Slh Avenue is approximately 7 feet above the level <br />ofthe golf courSe and is not impacted by flooding of the pond on the course. The <br />neighborhood pipe may be too small for the drainage area. <br /> <br />Staffhas developed the stormwater model to assess the situation and prepared preliminary <br />plans for the corrective measures. The estimated cost for the improvements is $7,000. The <br />pipe across the course mayor may not be in the drainage and utility easement. If the pipe <br />were in the easement it could be justified to use storm water utility funds to make the <br />improvements; however, the developer acknowledged that drainage from the commercial <br />and residential areas west of TH 47 would be accounted for in the ponds and piping <br />installed on the golf course. The model developed for this project was also used as <br />background information for the surface water management plan update. <br /> <br />Recommendation: <br /> <br />The City contribution to the project is preparation of the model and plans. Staff <br />recommends providing the plans to the golf course for construction by their forces or <br />contractor, along with some observation time during construction to maintain the intent of <br />the design. <br /> <br />Financial Impact: <br /> <br />Staff has worked on this project in the course of normal business. There is no direct impact <br />on the storm water utility fees from working on this project. <br />