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16 developer will be charged with violating a county ordinance and be subject to whatever legal action may be available. SECTION 4.7 STORMWATER DRAINAGE The subdivider shall provide for adequate drainage of all surface water using the existing natural drainage system. Major piping and modification of streams and other natural water courses is prohibited unless approved by the North Carolina Department of Natural Resources and Community Development. Points of interception of runoff shall be frequent enough to avoid heavy concentrations in any one system and to eliminate or minimize any flooding. Points of dis- charge shall be within the site unless otherwise approved by the Planning Board and adjoining owners. The subdivider shall provide retention/detention devices as may be applicable. Drainage calculations shall be based on a 10 year storm for on site drainage and a 25 year storm for thru site drainage. Minimum pipe size shall be 15 inches. Drainage plans must be approved by the county engineer. SECTION 4.8 WATER AND SEWER SYSTEMS Water and sewer systems do not include individual wells and septic tanks. A. Connection to a public water and sewage system is required where feasible. Subdivisions which lie adjacent to a public water and/or sewage system that can be feasibly extended to serve the subdivision and has the capacity to satisfy additional demand that might be imposed by the proposed development shall include plans for connection to such public system. B. If a water or sewer system is to be installed in a subdivision in the County's jurisdiction, and the system is to be assumed and maintained by a municipality or the county immediately upon completion of installation, a complete set of construction plans must be provided for the proposed system. The plans shall be prepared by a registered engineer and shall meet the utility requirements of the municipality and the Division of Health Services, North Carolina Department of Human Resources and/or the Division of Environmental Management of the North Carolina Department of Natural Resources and Community Department. The plans shall be approved by the county engineer and the munici- pality by the registered engineer retained by the developer or owner. The engineer shall provide As-Built-Plans and location maps for all valves and hydrant locations. C. Ail community water and sewer systems shall be designed by a registered engineer and be approved as follows: 1. Water or sewer systems in all subdivision and planned developments shall be approved by the Environmental Health Section of the Division of Health Services of the North Carolina Department of Human Resources, or the Division of Environmental Management of the Department of Natural Resources and Community Development, or the Cabarrus County Health Depart- ment, or their successor agencies, whichever has jurisdiction. Instal- lation of the system in accordance with the approved plan shall be certi- fied to the county engineer by the registered engineer retained by the developer or owner. 2. Community water systems shall meet the Cabarrus County water and sewer design standards. 3. Sewage systems shall be approved by the Division of Environmental Management of the North Carolina Department of Natural Resources and Community Development. SECTION 4.9 ROADS A. Each road shown on a plat shall be designated as either public or private. The arrangement, character, extent, width, grade, and location of all roads shall be reviewed in relation to existing and proposed transportation patterns, topographical and other natural features, public convenience and safety, and proposed uses of lands to be served by such roads and existing or potential land uses in adjoining areas.