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Health Department to guarantee the viability of septic systems include: a minimum septic tank elevation requirement of 48" above the wet season water table; a minimum separation distance requirement between septic tanks and potable water wells of 75 feet; and a limitation on total building square footage based on lot size and drainfield requirements. Because of the limitations associated with on-site septic systems, the county's policy should be to expand the public sanitary system throughout the urban service area. The Sanitary Sewer Sub - Element provides additional analysis of septic tank suitability in the county and the regulatory framework under which septic tanks are permitted. Table 2.12. Soil Characteristics and Suitabilitv Soil Drainage I Corrosivity Irrigation Septic Fields Dwellings Pond Steel IConcrete Poorly Moderate Low to Wetness, Severe limitations — Severe limitations — Severe Drained to High High Droughty, Wetness, Percolates Wetness Limitations — Fast intake slowly Seepage Moderately Low to Low to Wetness, Severe Limitations Slight to Severe Severe Drained Moderate Moderate Droughty, — Percolates slowly, Limitations — Limitations — Fast intake Poor filtering Wetness Seepage Excessively Low Moderate Droughty, Slight — Very poor Slight Severe Drained to High Fast intake, filtration. Potential Limitations — Soil blowing for groundwater Seepage contamination Data Source: U.S.D.A. - Soil Conservation Service Figure 2.26 shows soil characteristics which present severe limitations to development. Use Suitability of TopoLraphy The topography of Indian River County is generally flat with the exception of several ridges. Due to the lack of rough or rugged terrain, topography does not present any major limitations to development. Only a few areas along the coastal ridge have slopes steep enough to constrain development. Overall, topography is one of the principal influences on the drainage system. Because much of the county consists of relatively low flatlands, many of those areas, including the highly developed eastern mainland, would be underwater for portions of the year without man-made drainage ditches and canals. There are, however, certain county areas, such as the barrier island, the sand ridges, the St. Sebastian River area, and the higher elevations in the western county, which have a topography that results in the natural runoff of stormwater. Going forward, the county's policy should be to require that stormwater runoff from new development does not negatively impact adjacent properties or receiving water bodies. Because of the county's flat terrain, stormwater management systems are necessary to direct and retain stormwater runoff in developed areas of the county. Without such systems, frequent flooding Future Land Use Element 79