Ditches and roadside swales in subdivisions without curb and gutters shall be designed and constructed as follows.
(A) Roadside ditches shall be constructed of proper width, as specified in the Drainage Plan to provide positive drainage along the entire property frontage and to ensure that the drainage pipe or culvert under the driveway will not become blocked or clogged with debris. Areas disturbed by driveway construction or swale grading shall be stabilized, fertilized, and properly seeded to prevent erosion. A suitable outlet shall be provided for all side ditches to a natural, or established, drain or ditch, as specified in the Drainage Plan.
(B) The minimum slope on all roadside ditches shall be 0.25%. The maximum side slope for ditches shall be a three to one ratio, and the maximum back slope shall be a two to one ratio.
(C) The minimum depth of all roadside ditches shall be 18 inches below the edge of pavement.
(D) (1) All roadside ditches with grades of less than 3% shall be seeded and mulched with straw, or sodded. All ditches with grades of at least 3%, but less than 5%, shall be sodded, and all ditches with grades of 5% or more, or subject to severe washing or eroding, as specified in the Erosion Control Plan, shall be paved or protected by riprap of stone.
(2) Seeding and sodding shall be in conformance with the State Department of Highways Standard Specifications. The seed mixture to be used shall be indicated on the plans.
(E) No existing ditches shall be filled without written approval of the County Engineer.
(Prior Code, § 152.095) (Ord. 87, passed 4-18-1988)