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Page $4 3 Section 9. Stormwater drainage The subdivider shall provide for adequate drainage of all surface water. The purpose of the stormwster system is to control flooding and remove runoff from an area fast enough to avoid unacceptable amounts of ponding, damage, or inconvenience. Modifications of streams and other natural water courses is prohibited unless approved by the North Carolina Department of Environmental Health and Natural Resources and the Army Corp of Engineers. 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 discharge shall be within the site unless otherwise approved by the Planning and Zoning Comn%ission and adjoining property owners. The subdivider shall provide retention/detention devices as may be applicable. Drainage calculations shall be based on a five year frequency in agricultural and residential areas if greater than two acre lots, with all others designed at a 100 year storm for on site drainage and a 25 year storm for through site drainage. Minimum pipe size shall be 15 inches diameter. Velocities in storm sewer, when flowing full at average peak flows, shall not be less than 2.0'/sec. nor greater than 20.0'/sec. Cabarrus County prefers Low Impact Development (LID) techniques as s way to handle storm water flow that results from development activity and will accept proposals for storm water facilities that meet currently accepted LID practices. Section 10. Water and sewer systems A. Private wells and septic tanks must be approved by the Cabarrus County Health Department. B. Water and sewerage systems, which do not include individual wells and septic tanks, are subject to the following: 1. Connection to a public water and sewerage systems shall be in accordance with the policies and regulations of the Cabarrus County Water and Sewer Authority Board. 2. If s water or sewerage 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 installation, a complete set of construction plans must be provided for ~he proposed system. The plans shall be prepared by a professional engineer and shall meet the utility requirements of the municipality or county 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 Environmental Health and Community Development. The plans shall be approved by the County's Utilities Department Director or the municipality,s engineer. The developer,s engineer shall provide As-Built Plans and location maps for all valves and hydrant locations. ;%11 community water and sewerage systems shall be designed by a professional engineer registered in the State of North Carolina and be approved as follows: 1. Water and sewerage systems in all subdivisions and planned developments shall be approved by the appropriate agency. Depending on the type of system, ~hese agencies include the: a. Division of Health Services of the North Carolina Department of Human Resources. b. Division of Environmental Management of the Department of Environment, Health and Natural Resources. c. Water and Sewer Authority of Cabarrus County. d. Individual engineering department of municipality involved. Proof of approval shall be provided to the Cabarrus County Commerce Department before any work shall commence. Installation of the system shall be in accordance with the approved plan and shall be certified to the County by the registered engineer retained by the developer/owner.