Lawrence, KS Environmental Rules: Flood Zones (2026)

Lawrence City Code § 5-240 requires every building permit application to be accompanied by a scaled site plan showing new construction and existing structures, lot-line distances, established and proposed grades, and, where applicable, flood hazard areas, floodways and design flood elevations, drawn from an accurate boundary line survey. The building official may waive or modify the site plan requirement only for alteration, repair or otherwise-warranted work. A second, more specific layer applies to lots zoned RS3 or RS5 that are also mapped as "Zone X, Protected by Levee" on the city's official zoning district map: any proposed new residential building, building addition, or accessory structure not otherwise exempt from permit requirements under section 5-223 must include a stormwater lot grading and drainage plan submitted with the building permit application and reviewed and approved by the city stormwater engineer.

00 percent slope, with an underground pipe and inlets required for lesser slopes and paved swales), and any additional information the stormwater engineer requires, such as surveyed spot elevations, drainage swale details, and downspout or sump pump discharge locations. Section 5-311 separately directs that construction in floodplains proceed under article 12 of the city's land development code, a document adopted by reference and not reproduced in the general code text.