4.4 SR 10-17-2022 - Laserfiche WebLink

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I. Project Understanding Precipitation data collection has shown an increase in the number of short duration, high intensity storms. The shorter duration storms give the Morton Ave subwatershed area far less time to infiltrate water into the soil, stormwater runoff volumes increase, and critical infrastructure and homes are potentially threatened. Couple this recent phenomenon with undersized stormwater infrastructure and you have a recipe for disaster. Even 30 years ago, we may not have sized our storm sewer and drainage systems for a 10-year design storm. Now that the 10-year storm has become much more intense, the undersized infrastructure can't possibly manage the new runoff volumes. So, bottlenecks are exposed, and the result is localized flooding. Stormwater runoff from the Morton Avenue subwatershed accumulates and causes surface flooding at a regional low point near 319 Morton Avenue. A portion of the improvement costs may be assessed to benefiting property owners. Public assessments applied to the properties described in this report are subject to the requirements of Minnesota State Statute, Chapter 429 (MS 429). This Preliminary Engineering Report is the first step in the special assessment process required by the MS 429 Statute if assessments are applied. This report addresses the necessity for infrastructure improvements in the Morton Avenue drainage area. Included in this report is a description of proposed improvements, along with the estimated costs and assessments. The specific objectives of this report are to: • Evaluate the need for the project. • Determine the necessary infrastructure improvements. • Prepare cost estimates and assessment rolls for the proposed improvements. • Determine the feasibility of the improvements. II. MS 429 Process and Proposed Schedule As mentioned above, infrastructure improvements financed through the assessment of benefiting property owners are regulated by Minnesota Statute, Chapter 429 (MS 429). The process prescribed by MS Chapter 429 along with the proposed project schedule is described below. The benefited parties submit a petition for the proposed improvements to the City Council or, as in this case; the improvement process was authorized by the City Council without a petition. An optional public open house was held to inform residents of concepts and receive input on proposed improvements. Completed: September 26, 2022 The City Council held a work session to discuss the preliminary concepts of this study and evaluate possible funding sources. Estimated date: October 3, 2022 The City Council passes a Resolution ordering preparation of a Feasibility Report to be completed for the proposed project. Estimated date: October 17, 2022 Prepared by: Bolton & Menk, Inc. Project Understanding Morton Avenue Drainage Study I OR11.127809 Page 1