Title
Resolution - A Resolution Authorizing Funding in an Amount Not to Exceed $58,500 and Approval of Contract with Westra Consultants, LLC, to Conduct the Miscellaneous Drainage Analysis of Three Areas (Drainage Utility Fund)
Recommendation
The authorization of funding in an amount not to exceed $58,500 and approval of contracts, including design, and survey with Westra Consultants, LLC, to conduct the Miscellaneous Drainage Analysis of three areas.
Description/History
The June 3 storm caused flooding issues throughout the City. The area most impacted was the northeast quadrant. Staff met with multiple residents to assess their properties and create an action plan to help prevent flood issues.
Three areas were identified for additional investigation that have not been addressed yet. Staff has inspected the underground systems and no obstructions, blockages, or other problems were present. Initial desktop investigations have not revealed potential solutions.
Several homes in The Oaks subdivision across from Brooks Wester on N Walnut Creek Dr. were flooded. Most of the affected homes are located on Red Oak Dr., with another home on Willow Creek Dr. These properties have a large diameter storm drain main the runs through several backyards. The consultant for this project will evaluate the capacity of that underground system to determine if additional flows may be accommodated, and at what point the system begins to fail.
In the Five Oaks subdivision north of E Debbie Ln, across from the Ladera development, flooding through Willowbrook Dr was so severe a car was flooded. No structures received water, and no injuries were suffered. The consultant for this project will evaluate the original plan design for the subdivision, and surrounding developments, to verify compliance with City standards were followed.
The final location is the Willowstone Estates detention pond located at Raintree Ct. This development has several ponds on its perimeter to address developed flows and prevent flooding to offsite properties. This is the largest of those ponds and has a regular pool of water present at all times. Flooding occurred on several properties at Moore Rd. and Spirit Walk Dr. due to the pond overflowing its embankment. The consultant for this project will evaluate the pond capacity and expected drainage flows.
A technical memo will be prepared at the close of each project location summarizing findings and proposing potential solutions for each. No concept analysis, design, or proposed improvements are included as part of this project.
Justification
This project is needed to understand the flooding situation in 3 locations and determine if potential projects may be needed to address the issue.
The Environmental Manager and Executive Director of Development Infrastructure will be in attendance at the meeting to answer Council’s questions regarding the proposed funding and contracts.
Funding Source
Drainage Utility Fund
Prepared By
Howard Redfearn, Environmental Manager, Environmental Services Department, 817-276-4240