In 2011, the City of Owasso contracted with Meshek to design and construct the Garnett Regional Detention Facility: over 100 acre-feet of stormwater storage volume immediately downstream of a rapidly developing commercial district. Approximately half of its storage volume was reserved for flood mitigation downstream of the pond site, resulting in reduced flow rates for all storm frequencies. The remaining storage was used as fee-in-lieu of onsite detention to both offset the impact of current and future development of 100 acres, and to facilitate funding of the project.
Because of this facility, a significant amount of upstream development is now able to expand with no adverse impact on the downstream floodway and floodplain.
The design considered other competing interests as well, including obtaining:
- An Individual 404 Permit from the U.S. Army Corps of Engineers
- A 401 Water Quality Certification from the Oklahoma Department of Environmental Quality
These permits required a mitigation plan illustrating a substantial amount of wetland and native species plantings, and including a constructed wetland in the bottom of the pond.
Construction Cost: $1,500,000
Notable aspects of the design include creating a mitigation plan for obtaining necessary permits.