Title
Consider and take action on a resolution authorizing a professional services agreement with Gauge Engineering, LLC. for design work related to drainage improvements for the FM 518 & Wesley Drive Drainage Improvements Project (DR2010) in an amount not to exceed $626,082 (Director of Engineering)
Background:
Approval of this resolution will authorize the City Manager to enter into an agreement with Gauge to design drainage improvements in the FM 518 and Wesley Drive area for an amount not to exceed $626,082.
In 2014, a drainage study for League City was conducted by LAN Engineering. The study noted some deficiencies in the drainage systems along the FM 518 corridor and specifically noted that roadway flooding in moderate rainfall events can happen in the Highland Terrace area. the study noted that Highland Terrace is a significant sheet flow path for the neighborhood to the south. Using neighborhood streets to convey excess flows during significant rainfall events is appropriate; however, the Highland Terrace sheet flow path is blocked by a local high point near its intersection with FM 518. This causes the 100-year sheet flow to inundate properties to the west. It was also noted that the storm sewer network surcharges above the ground elevation in several locations. The 2014 study noted 3 possible solutions for this issue: Raise the vertical profile of FM 518, Create alternate overland flow paths, and Improve sub-surface drainage.
The executed PSA will allow for the following:
• Updated Drainage Study of the area to either validate the 2014 project recommendations or to develop a modified recommendation that efficiently and effectively addresses the flooding issues and prevents downstream impacts. This updated study will use the Atlas 14 rainfall intensities, current modeling technology, and updated models in Clear Creek in reviewing solutions.
• Design Phase which will include the production of a detail...
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