(A) The preferred runoff pattern shall be towards the street. The design of streets and grading shall be such that runoff from roofs, driveways, and other impervious surfaces will be collected in ditches or gutters in short runs 300 feet to 400 feet in length. The runoff shall then be diverted from the surface into storm sewers or a natural watercourse. Streets shall be located away from watercourses unless storm sewers are to be installed.
(B) Adequate measures for the protection of open and closed drainage channels shall be provided.
(C) Property lines shall be so designed as to follow drainage easements, except that such easements may cross lots larger than one acre.
(D) No watercourse shall be altered in such a way as to change the amount or direction of flow. No fill, building, nor structure shall be situated in natural watercourses unless provision is made for the flow of water in a manner satisfactory to the Village Engineer.
(E) Finished grade at building foundation for all structures shall be a minimum of one foot above grade at the sidewalk or front lot line (street right-of-way) and shall be shown on the site grading plan for each lot. Retaining walls shall be constructed on side or rear lot lines where the grade varies across lot lines by one foot or more within three feet of the side lot line. No foundation for any occupied structure shall be placed at an elevation lower than the 100-year flood reoccurrence elevation.
(F) A grading and drainage plan shall be submitted, showing all existing and proposed storm sewers, manholes, catch basins, watercourses, culverts, and other underground structures within the tract and immediately adjacent thereto, with pipe sizes and grades or waterway openings indicated thereon. Topographic contours to one foot shall be indicated thereon. The plan shall show the method to be used for adequate disposal of all storm sewer water, including drainage outlets, and shall include a typical lot cross-section drawn perpendicular to the street indicating lot grading and such other data as may be required by the Village Engineer. Rear yard drains may be required to be installed by the developer at the time of initial subdivision improvement, as determined by the Planning Commission. Such plan shall be drawn at a scale of not more than 50 feet to the inch.
(Prior Code, § 1248.17) (Ord. 2000-9, passed 9-11-2000) Penalty, see § 153.999