04-21-2025 - Agenda Packet Planning Commission - Packet

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Stormwater Narrative/Summary March 11, 2025 Woodhill CC – Course Renovation Project Wayzata, MN 2 | P a g e Project Overview Woodhill Country Club is an existing golf club located in Orono and Wayzata, MN. The golf club falls within two separate LGU boundaries, Minnehaha Creek Watershed District (MCWD) and the city of Wayzata. All storm sewer trunkline replacement as well as pond 14 and 15 infill will fall under Minnehaha Creek Watershed jurisdiction. All proposed work on Pond 7/9 will fall under the city of Wayzata jurisdiction. The golf course encompasses a total of 193.63-acres with a total disturbed area of approximately 5.25 acres. The project aims to create a more welcoming and enjoyable course for golfers of all ages and skill levels. The project will include the reconstruction (re-grading and shaping) of greens and tee box features to accommodate the revised course layout. Existing drainage structures and pipes will also be removed and replaced to ensure course drainage is maintained into the future. Existing Site Conditions The 193.63-acre property is located between Highway 12 and County Road 15 and consists of the existing golf course (maintained turf, sand bunkers, etc.) and surrounding undeveloped wooded areas. The golf course runoff drains southward towards existing wetland P10, adjacent to the entrance and southern portion of the course property via a series of ponds, swales, area drains and pipes. Eventually outletting to Ferndale Marsh and Lake Minnetonka The golf course hydrology consists of depressions, man-made ponds, and wetlands which is collected by numerous area drains pipe that tie-into a mainline storm sewer network. The existing storm sewer network and course hydrology can be found in Appendix B – Existing Drainage Map. The storm network starts at pond P12. Pond P12 is outletted by a 6” PVC pipe. This pipe runs north and ultimately outlets into Wetland P2. Wetland P2 is outletted by a 10” DIP pipe that runs east along the north side of the course and club house before turning south where it outlets into existing Wetland P10. Soils Soil borings were not completed for this project. NRCS Web Soil Survey indicates the presence of soils composed primarily of silt loams, clay loams, and muck throughout the site, which has been confirmed by the golf course superintendent who is familiar with the grounds. For our stormwater modeling purposes, we have assumed a Hydrologic Soil Classification of C/D for existing and proposed conditions. See Appendix A: NRCS Custom Resource Report Proposed Site Conditions The proposed project will consist of minor grading and re-shaping of greens and tee-boxes, the reconstruction of surface and subsurface drainage, replacement of the trunkline storm sewer for course drainage, as well as the removal and limited reconstruction of the existing bituminous cart path. Grading work will not result in altered drainage patterns and the course runoff is proposed to be routed identically to the existing conditions. In addition, the goal of the proposed drainage infrastructure replacements is to reconstruct existing conditions, with minor exceptions to better mimic natural drainage and/or to increase maintainability. Ponds/wetlands P12, P2, P10, P1 see no disturbance besides the replacement of inlet/outlet pipes to these ponds/wetlands and remain the same from a drainage perspective. Furthermore, large scale drainage 140