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REQUEST FOR COUNCIL ACTION DATE: 6/19/QC ITE1v�: 4.f DepartmentApproval: ManagerReviewed: Agenda Section: � y�� Consent Item Description: Approving proposal for storm water modeling of Charlie Pond Area. Background: Over the years, the City has made a number of improvements to address street flooding on Avon Street and M�llwaad Avenue as well as increasing the pollutantremoval efficiency within the Charlie Pond subwatershed of Lake Owasso. Changes in subwatershed boundaries, the addition of the Valley Park ponds, new outlets, and larger pipes have all played a role in improving the drainage for the area. As recently as 6 years ago there were 13 vacant lots in this neighborhood. In the last 6 years, 7 of these lots have been developed as single family homes. 6 of these lots are located along the south side of Brenner Avenue west of Millwood Avenue. As these lots continue to be developed, renewed neighborhood concern has been expressed about the need for additional storm water improvements for this subwatershed. One of these vacant lots is between 812 and 800 Brenner Avenue and has a low area that drains into the City's system. To determine the role that this low lot plays in the updated overall storm water system, a new model needs to be created. While this area has been modeled in a variety of formats over the last 20 years, numerous changes and modifications have been made within t�c watershed. It is recommended that we have an X�'- SWMM model created for this area. This will be built on the existing Hyd�raCAD modeling. The XP-SWMM analysis will allow us to evaluate the performance of the system during intense storm water events and evaluate the impact of developing additional lots within the study area on the elevation of flooding within rear yards, low areas and intersections in this neighborhood. This is specializedwork so we have requestedthat three consultingcompaniesprovide us proposals to complete the new model. We received three proposals for this work, from Bonestxoo, Anderlil{ and Associates, URS, Inc., and WSB & Associates. After reviewing their proposals, staff recommends that we engage URS, Inc. to complete this work at a cost not to exceed $7,100. All costs for this analysis will be paid for using storm water infrastructure funds. The findings will be brought to the City Council later this summer. Staff Recommendation: Staffrecommends engaging URS, Inc. to complete the Charlie Pond storm water modeling and report. RECOMMENDED COUNCIL ACTION: Motion to authorize staff to engage URS, Inc. to complete the Charlie Pond storm water modeling and report. Prepared By: Debra Bloom