Agenda - Public Works Committee - 10/16/2007

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Rum River Hills Golf Course Page 2 of2 much work is to remove the submerged pipe and 100 feet of the outfall pipe and replace them with new pipes and a control box. The,control box would be 3 ft x 2 ft and have channels in the sides for boards which could be used to control the elevation of the ponds. The pipe to the pond and the outlet pipe would be installed on the bottom of the box. The box would have a removable metal cover to allow adjustment of the boards inside. The additional boards could be added to retain more water in the ponds during dry periods, and removed quickly if a large rainfall occurs. The elevation of ponds further east on the course is controlled by adding or removing boards. These improvements have been discussed with the golf course maintenance staff and are scheduled to be brought to the Golf Course Board. The proposed work should be performed after the close of the golfing season. The discussion in 2005 centered on whether or not water backing up on the golf course was affecting the level in the pond adjacent to the residents. Review of the model indicates this is not the case. The area north of 168th Avenue is approximately 7 feet above the level ofthe golf course and is not impacted by flooding of the pond on the course. The neighborhood pipe may be too small for the drainage area. Staff has developed the stormwater model to assess the situation and prepared preliminary plans for the corrective measures. Tq.e estimated cost for the improvements is $7,000. The pipe across the course mayor may not be in the drainage and utility easement. If the pipe were in the easement it could be justified to use storm water utility funds to make the improvements; however, the developer acknowledged that drainage from the commercial and residential areas west ofTH 47 would be accounted for in the ponds and piping installed on the golf course. The model developed for this project was also used as background information for the surface water management plan update. Recommendation: Staff recommends installing the improvements on the golf course as outlined above. Additional field verification should be done on the ditches and pipes in I 68th A venue to determine the corrective work needed to provide an overflow for larger storm events while preserving the level of the wetland. Financial Impact: The cost of the improvements on the golf course will be taken from the Storm Water Utility Fund. The estimated cost is $7,000. Action: Motion to recommend the City Council approve the pipe replacement on the Rum River Hills Golf course as outlined. Reviewed By: Director of Public Works/Principal City Engineer Public Works Street Supervisor 28. PW: 10/16/07