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Stormwater master plan spotlights levee-critical zones and detention-basin trade-offs for Mackin Park
Summary
City staff presented a stormwater master plan showing North Kansas City is ringed by levees but contains interior flood-hazard areas. Staff described levee critical-zone restrictions, compensatory storage rules and a detention-basin concept at Mackin Park that could reduce neighborhood street flooding.
City staff gave commissioners a detailed briefing on the North Kansas City stormwater master plan, describing overlapping regulatory areas that affect where and how the city can manage stormwater.
"North Kansas City is completely surrounded by levees," Anthony (city staff) said, explaining the city sits inside a river flood plain and has interior mapped flood-hazard areas where some homes and businesses still must carry flood insurance. Anthony described three regulatory layers — FEMA floodplain, the levee critical zone (which triggers levee-district and Army Corps reviews), and a municipal source-water protection area — and said each layer imposes different design and material constraints on projects.
Staff outlined a Mackin Park West detention-basin concept that would upsize an existing pipe on 28th Avenue and create a basin to accept overflow during storms. The basin approach, staff said, stores water in a designed location rather than allowing localized street ponding. Anthony also explained compensatory storage requirements: when a site is elevated with fill to meet building elevation needs, developers must provide equivalent excavation so the floodplain boundary is not displaced outward.
Commissioners asked whether the smaller, project-specific excavation for the Victoria building could be coordinated with the larger master-plan detention project to avoid duplicative work. Staff said engineers are exploring tie-ins to the existing storm pipe to allow a phased approach and noted projects inside the levee critical zone often require extended federal review times. The briefing emphasized that individual projects will need additional engineering and Army Corps approvals before construction can proceed.
