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Article 6: Development Standards <br />Section 6.14: Stormwater Management <br />(6) Trail crossings, and associated bridge or other structure, provided they are <br />oriented perpendicular to the stream and constructed in accordance with best <br />management practices to minimize soil erosion and other adverse impacts to <br />water quality. <br />(7) Public water and sewer lines that disturb over 40 linear feet, but not greater than <br />150 linear feet of riparian buffer. <br />(8) Temporary roads intended for access to a property for development purpose. <br />(9) New stormwater management ponds, with or without a riparian buffer established <br />adjacent to the pond. <br />(10) Vegetation Management that includes the installation of new vegetation and a <br />one -time application of fertilizer to re- establish the vegetation. <br />(11) Vegetation Management / Replanting in an effort to protect existing structures. <br />6.13.7 Diffuse Flow Requirement <br />(A) Diffuse flow of runoff shall be maintained in the stream buffer by dispersing concentrated <br />flow and re- establishing vegetation. <br />(B) Concentrated runoff from new ditches or constructed conveyances shall be converted to <br />diffuse flow before the runoff enters the stream buffer. <br />(C) Periodic corrective action to restore diffuse flow shall be taken if necessary to impede the <br />formation of erosion gullies. <br />6.13.8 Land Disturbance and Planting of Vegetation <br />(A) Area within a stream buffer which is subject to serious erosion may be disturbed for the <br />purpose of planting and maintaining erosion - resistant vegetative cover. <br />(B) Existing forested areas or any other healthy vegetation may not be removed from a <br />stream buffer, except where replaced with vegetation resulting in comparable stormwater <br />runoff velocity and quantity one year after planting. <br />(C) New vegetation shall be planted to capture non - source pollutants before they reach the <br />perennial stream, as per applicable Orange County Standards. <br />6.14.1 Introduction <br />As a watershed becomes more developed, the amount of impervious surface increases, causing <br />a decrease in the rate at which stormwater runoff which can be absorbed into the soil. This <br />results in more stormwater flowing directly into streams and other water bodies. Because this <br />direct runoff has not been filtered through the soil, pollutants from the air and land surface enter <br />streams and increase the potential for pollution of drinking water supplies. <br />6.14.2 Purpose <br />The purpose of the Board of County Commissioners in adopting stormwater regulations is to <br />protect the water quality of the streams that lie within Orange County by reducing and controlling <br />stormwater runoff and addressing nutrient reductions for both new and existing development. <br />6.14.3 Jurisdiction -Wide and Inter -Local Approaches <br />(A) Orange County shall have the option of implementing jurisdiction -wide and /or inter -local <br />approaches to control stormwater runoff and achieve nutrient reductions. <br />(B) Any jurisdiction -wide and /or inter -local approaches must be approved by the Orange <br />County Board of Commissioners, and the Environmental Management Commission <br />before implementation. <br />Orange County, North Carolina — Unified Development Ordinance Page 6 -100 <br />