(A) When all of the data collected has been considered together, a picture of the site potential and limitations should begin to emerge. The drainage engineer should be able to determine those areas of the site which have potentially critical drainage hazards.
(B) The following are some important points to consider in site analysis.
(1) Topography. The primary topographic considerations are slope steepness and slope length. Because of the adverse effect of long and steep slope on runoff, special care should be used in these potentially critical areas.
(2) Natural drainage. Natural drainage patterns exist on the land and should be identified on the plan so they can be incorporated into the proposed drainage system. Where it is possible, natural drainageways should be used to convey the runoff to avoid the expense and problems of constructing artificial drainage systems. Care should also be taken to be sure that the existing natural drainage system is not overloaded.
(3) Soils. The major soil consideration from a runoff control standpoint is rate of infiltration of rainwater. Soils of the county have been grouped into hydrologic soil classes, which can be used to help determine the areas where critical runoff will occur.
(4) Ground cover. The type of existing ground cover greatly affects the amount of existing runoff from any given area. By knowing the types of existing ground cover and the proposed types, critical areas of runoff can be determined.
(Ord. 16-96, passed 4-15-1996)