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3 R (7) Where permitted, open drainage -ways shall retain natural design characteristics and be so designed and protected that they do not present a hazard to life or property. The design shall include measures to protect against scour and erosion and provide for stable side slopes. Whenever possible, such waterways shall provide for adequate flushing action by prevailing winds and currents to assure the prevention of stagnant water and debris accumulation. (8) Disposition of Stormwater Runoff - The stormwater management system for development located predominantly on excessively drained soils should maximize stormwater infiltration. This shall be accomplished through the use of bottomless inlets, perforated pipe, grading to retard runoff, natural or artificial retention or detention basins, or other methods, depending on the characteristics of the land area. Specific guidelines are as follows (a) Areas and lots shall be developed to maximize the amount of natural rainfall which is percolated into the soil and to minimize direct overland runoff into adjoining streets and water, courses. Stormwater runoff from roofs and other impervious surfaces should be diverted into swales, or terraces on the lot. (b) Street drainage shall be by grassed swales or curb and gutter in accordance with County specifications, provided all curb and gutter systems shall discharge or direct water into or across a grassed swale area or other filtering medium. (c) Whenever practical, as indicated by soil character- istics, water table elevation, and topography, the overflow from any swale used shall be diverted to percolation areas, ponding areas or natural or artificial seepage basins of sufficient capacity to retain and provide for the maximum infiltration of stormwater runoff from each drainage area for the design storm. (d) Whenever practical, except in those development projects where temporary ponding is allowable pursuant to Section 7 (A) (12), each percolation or retention area shall include positive drainage facilities which provide for drainage to public outfalls or a lake, or water course, to handle the runoff from storms of longer duration and severity. (e) The area surrounding retention or detention basins is recommended to be used as public or private open space and shall be grassed. (f) The Soil Survey of Indian River County, Florida, published by the U.S. Department of Agriculture, as made avail- able, shall be the document to determine soil classification in this ordinance.