Title
Consider and take action on a resolution authorizing a professional services agreement with Halff Associates Inc. (Halff) for design work related to the Bay Colony Area Detention Modification Project (DR 1909) in an amount not to exceed $656,558 (Director of Engineering)
Background:
Approval of this resolution will authorize the City Manager to enter into an agreement with Halff to design detention pond modifications and related drainage improvements for existing detention areas within the greater Bay Colony Area and along Magnolia Bayou and Borden’s Gully for an amount not to exceed $656,558.
In the aftermath of the Hurricane Harvey flooding, a Hydrologic & Hydraulic (H&H) Study of areas within the Magnolia Bayou and Borden’s Gully Watersheds was conducted. On November 29, 2018, City Staff and our consultant held a public meeting to go over the preliminary findings of the study and to discuss potential improvements to help reduce flooding within this area. One of the areas of concern discussed during the public meeting was the detention capacity in the greater Bay Colony area subdivisions.
Based on the study, City Staff created a potential drainage improvement project. This project was included as part of a list of potential drainage projects outlined on the City’s recently passed May 2019 General Obligation Bond Referendum.
For this Professional Services Agreement, Halff will provide engineering services for drainage improvements, specifically detention pond modification of 18 existing detention ponds and potential improvements to both Borden’s Gully and Magnolia Bayou. The project will add approximately 70 acre-feet of additional detention to these areas.
The PSA covers the following items:
· Topographic survey of ROW, detention basins, and channels within the project limits. The proposed cost for this activity is $109,500.
· Review of previous drainage analysis with a comparison of survey data against As-Built data, and analysis of Magnolia Bayo...
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