Orange County NC Website
Browse       Search
026 <br /> Section 6 Nutrient Load Calculations <br /> For the purpose of this Ordinance new development shall be defined by as to include the <br /> following: <br /> • Any activity that disturbs greater than one acre of land in order to establish, <br /> expand or modify a single family or duplex residential development or a <br /> recreational facility. <br /> • Any activity that disturbs greater than one-half an acre of land in order to <br /> establish, expand, or modify a multifamily residential development or a <br /> commercial,industrial or institutional facility. <br /> New development shall not include agriculture,mining,or forestry activities. Land disturbing <br /> activity is defined as grubbing, stump removal, and/or grading. <br /> A. The nitrogen export from each new development must'be calculated. This export will <br /> be calculated in pounds per acre per year(lbs/ac/yr). The two methodologies that are to <br /> be used are as follows. <br /> 1. Method 1 <br /> This method is intended for use where lots are shown but the actual footprint of <br /> buildings are not shown on site plans. This method does not require calculation of <br /> the area of building footprints. Rather,the impervious surface resulting from <br /> building footprints is estimated based on typical impervious areas associated with <br /> a given lot size. This method is shown in Appendix 1. <br /> 2. Method 2 <br /> This method is for residential,commercial, and industrial development when the <br /> entire footprint of the roads,parking lots,buildings, and any other built-upon area <br /> is shown on the site plans. This method is simpler and more accurate since it does <br /> not require estimating the impervious surface based on lot size. Method 2 is <br /> shown in Appendix 2. <br /> a) If a non-residential subdivision plan is submitted without impervious <br /> surfaces not shown,the following two options are available: <br /> (1) Option A <br /> Property owner must specify the areas of impervious surface, <br /> undisturbed open space and managed open space on the property in <br /> a restrictive covenant. Method 2 would then be applied. <br /> (2) Option B <br /> Planning staff will determine a worst-case scenario for the areas of <br /> impervious surface and managed open space for the type of <br /> development specified. Method 2 would then be applied. <br /> B. Nutrient Export Figures <br /> Calculations must be in accordance with either Method 1 or 2 shown in Appendix 1 and <br /> 2,respectively, of this Ordinance. <br /> C. Nutrient Export Reduction Options <br /> 20 <br />