A. Waterways.

(1) Every effort shall be made to retain the natural drainage systems in the City including existing wetlands and ponds. The natural drainage system shall be maintained by the City. Aboveground runoff disposal waterways may be constructed to augment the natural drainage system.

(2) The width of a constructed waterway shall be sufficiently large to adequately channel runoff from a ten-year storm. Adequacy shall be determined by the expected runoff when full development of the drainage area is reached.

(3) No fences, driveways or structures shall be constructed across the waterway that will reduce or restrict the flow of water.

[Amended 1-12-2004]

(4) The banks of the waterway shall be protected with permanent vegetation.

(5) The banks of the waterway should not exceed four feet horizontal to one foot vertical in gradient.

(6) The gradient of the waterway bed should not exceed a grade that will result in a velocity that will cause erosion of the banks of the waterway.

(7) The bend of the waterway should be protected with turf, sod or concrete. If turf or sod will not function properly, riprap may be used. Riprap shall consist of quarried limestone, fieldstone (if random riprap is used) or construction materials of concrete. The riprap shall be no smaller than two inches square nor no larger than two feet square. Construction materials shall be used only in those areas where the waterway is not used as part of a recreation trail system.

(8) If the flow velocity in the waterway is such that erosion of the turf sidewall will occur and said velocity cannot be decreased via velocity control structures, then other materials may replace turf on the side walls. Either gravel or riprap would be allowed to prevent erosion at these points.