07-06-2021 WS - Laserfiche WebLink

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case, we will have to work primarily with the DNR and Rice Creek and to a much lesser degree, MnDOT specific to the culverts under US 10. Rice Creek Watershed, like us — has to develop/update their 10 year Water Management Plan 2020-2029. That documents (included) details Mounds View comprises 2.2% of the district, Spring Lake is 44 acres and 18' at its deepest point, there are no impaired waters in Mounds View on the impaired waters list, and that the upper 20 miles of the district (which includes Mounds View, is relatively flat with a fall of less than 1 foot per mile. That fact becomes extremely important in maintenance of the public drainage system as it results in very poor drainage. Their plan emphasizes a focus on Public Drainage Systems (ditches) and building partnerships and working collaboratively to manage the overall system. Local Surface Water Management Plan (LSWMP): Local units are required to maintain a LSWMP and update it every 10 years, this is part of the Met Council requirement of having an updated Comprehensive Plan. This is a major component of our Storm Water Management strategy. It details all system components, structures, and most importantly —defines the seven sub -drainage districts that control/manage our stormwater. There are 10 sub -districts total of which 7 are substantive and 3 have one or more significant issues. All of our water eventually makes it to Rice Creek and from thereon, to the Mississippi River. Sub -Districts: 35W-1— Business Park North on south to our northern boundary, 35 W on east to Jackson (meandering line) with no substantive issues. Majority of management is accomplished via underground pipe with one small pond. Arden — Major sub district that drains the entire NW portion of the City. Boundary is 851" on north, meandering line north of Hillview on South, near city border on west and Arden Park on east. Major issue with culverts under US 10 filling up with sediment therefore restricting flow and needing removal. These are DOT property and thus, coordination is needed with them. We believe water levels are 8" to 16" higher than they should be and this has contributed to numerous storm water complaints at properties within the City. The storm water management ponds are also above their normal level causing flooding in their immediate area and potential tree mortality. These ponds and the Silver View Pond also have massive invasive specifies of vegetation that should be addressed. Business Park North — Drains the entire park into two ponds along the Blvd on the west side that when full, flow into a culvert under the Blvd and then in pipe to Rice Creek. The east side uses a combination of private and public ponds on —when at overflow; go into pipe down to Rice Creek. There are no substantive issues but there is desire to determine sediment levels in the two ponds along the Boulevard and upgrade the "skimmer" on the west pond.