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Kingman adopts new drainage manual, adds 36-hour maximum drain time and stricter stormwater rules
Summary
After a staff presentation, the council declared the new City of Kingman Drainage Design and Administrative Manual a public record and adopted Ordinance 2002004, aligning many standards with Mohave County, adding a 36-hour maximum drain time and new policies on utilities and drainage-parcel coordination.
The council adopted a revised City of Kingman Drainage Design and Administrative Manual intended to replace a 1988 manual and to align city policy with county standards. Engineer Mike Garment said the new manual broadens the definition of "development," incorporates updated NOAA rainfall data, adds a maximum roadway drainage velocity (8 feet per second), and tightens stormwater storage requirements, including a maximum 36-hour drain time for retention basins.
Garment highlighted policy changes that will require city-engineer approval before locating utilities in drainage parcels to avoid costly relocations—he cited an example at the Airway/McClintock intersection where relocating sewer lines could cost the city "a couple million dollars." The manual also adds an enforcement path for property owners who alter drainage in ways that adversely affect neighbors. Council first approved Resolution 5634 to declare the manual a public record and then adopted Ordinance 2002004 by council vote.
