Approval for the City of Muskogee to submit a Notice of Intent to seek potential funding for the Meadows Subdivision Flood Mitigation Study, in the amount of $150,000.00, and the Citywide Stormwater Management Plan, in the amount of $500,000.00, to accept said grant funds if awarded, and use of the matching grant funds in the amount of $187,500 for these grants, or take other necessary action. (Mike Stewart)
BACKGROUND:
This item is to inform the City Council of the City staff's intent to seek grant funds for studies on Citywide and Meadows Subdivision drainage issues. These studies are necessary for the City to secure further grant funds in the future, such as the FEMA BRIC grant.
There are 2 elements to this report:
1.) Citywide Master Drainage Plan- To secure potential grant funds in the future as it pertains to stormwater drainage grants for studies, improvements, and other various opportunities, the City must have a master stormwater drainage plan. A master stormwater drainage plan is an engineered study that indicates problem areas in the City as it relates to:
A complete inventory of the components, location, and condition of the public drainage system.
The nature and magnitude of flood risk throughout the City.
The relative degree of flood risk in different areas of the City necessary to establish priorities for further studies and capital improvement projects.
The likely range of costs to mitigate flood risks in the flood-prone parts of the City.
The scope of this plan would be to build on the city-wide rain on grid analysis and hot spot identification already completed to achieve the following:
Review problem areas in detail
Develop a prioritization criterion
Develop mitigation project concepts
Rank Projects
Prioritize watersheds for further detailed study
Program a 5-year capital improvement program and watershed study plan
Conduct a detailed modeling and refine flood mitigation concept development for 1 or 2 of the highest priority watersheds.
The grant amount would be $500,000.00, the City would need to provide a 25% match for this if awarded the grant.
2.) Meadows Subdivision Flood Mitigation Study- As the Council is aware, much of the Meadows is in the Special Flood Hazard Area and the City reports that the area experiences frequent road flooding that impedes ingress and egress as well as structural flooding. Over 50 residences reported flooding in May 2022, including significant structural flooding with floodwaters up to 3 feet inside homes. Based on a high level , rain-on-grid analysis already conducted, approximately 80 residential properties are subject to inundation in a 100-year event. Additionally, the road flooding impacts response time for first responders as well as community accessibility to residents and visitors.
The scope of this study would include a detailed hydraulic and hydrologic analysis to refine the nature and magnitude of the risk, identify potential mitigation alternatives, and design the selected alternative. The mitigation alternatives expected to be evaluated are:
Bridge improvements to reduce bottlenecks and resulting road and structural flooding due to undersized culverts.
Upstream detention to mitigate road and structural flooding
Residential buyouts
Some combination of the above
The grant amount would be $150,000,00 and does require a City 25% match.