TO: Mayor and Members of City Council
THRU: Adam Lindsay, Assistant City Manager
FROM: Sheila Thomas-Ambat, PE, CCM, CFM - Public Services Director
DATE: April 4, 2022
RE:
Title
Locks Creek Watershed Master Plan Recommendations and Letter of Map Revisions Update
end
COUNCIL DISTRICT(S):
Council District(s)|109|
b
Relationship To Strategic Plan:
Goal 1. Safe and Secure Community
Goal 3. City Investment in Today and Tomorrow
Executive Summary:
Three options (Option 1 Phase I, Option 1 Phase II, and Option 2) have been developed to mitigate flooding impacts in the Locks Creek neighborhood.
Option 1 Phase 1 consists of drainage improvements, additional culverts on Locks Creek Road, and increased road height of Locks Creek Road. This option also includes secondary improvements to Pasture Lane, Windmill Rd., and Bridgeton Way. This option will mitigate flooding of approximately 3200 ft. of impacted lane length, and will provide emergency access for approximately 200 homes for up to the 50-year event. The improved emergency access is the primary benefit of this option. However, this option will not substantially mitigate flooding impacts of homes, mitigating flood impacts for only 1 home during the 2-year, 10-year, and 50-year storms. Total estimated cost is $8.8M. Given the improved access to about 200 homes, this option is recommended for further study, and detailed design and construction.
Option 1 Phase II will include the above and in addition increase the opening under NC53 and increase capacity of the downstream drainage channel, thereby eliminating the current bottleneck. This solution primarily mitigates road flooding, and additionally provides some mitigation of buildings in the neighborhood, along Turkey Run, Whisker Lake Drive, Pasture Lane, and some commercial property along Cedar Creek Road. While the LOS will increase for several properties along the south side of Bombay Drive, the highest level of service for many buildings...
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