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Article 6: Development Standards 20 <br /> Section 6.14: Stormwater Management <br /> (1) The following are acceptable methodologies for computing the pre-and post- <br /> development conditions for the 1 year,24 hour storm: <br /> (a) Rational Method, <br /> (b) Peak Discharge Method as described in the USDA Soil Conservation <br /> Service's Technical Release Number 55 (TR-55),er <br /> (G) PUtRaFn Meta <br /> (d) Alternative methods must be approved by the County and the EM(;. <br /> (2) The same method must be used for both the pre-and post-development <br /> conditions. <br /> (3) Raleigh Rainfall Depths <br /> 6.14.9 Stormwater Management Plan <br /> (A) Required Approval <br /> The Erosion Control Officer shall not issue any permits for new development on any land <br /> within Orange County subject to the provisions of this Section, unless and until a <br /> Stormwater Management Plan has been reviewed and approved in accordance with <br /> Section 2.21.1 of this Ordinance. <br /> (B) Compliance with Requirements <br /> Any person engaged in new development activities as defined by this Section who fails to <br /> file a plan in accordance with this Ordinance, or who conducts any new development <br /> except in accordance with provisions of an approved Stormwater Management plan shall <br /> be deemed in violation of this Ordinance. <br /> (C) Enforceable Restriction <br /> Approval of the Stormwater Management plan shall require an enforceable restriction on <br /> property usage that runs with the land,such as a recorded deed restriction or protective <br /> covenants, to ensure that future development and redevelopment maintains the site <br /> consistent with the approved Stormwater Management plan. <br /> 6.14.10 Operation and Maintenance of Structural Stormwater Measures <br /> (A) Posting of Financial Security <br /> All stormwater control structures shall be conditioned on the posting of adequate financial <br /> assurance for the purpose of maintenance, repairs or reconstruction necessary for <br /> adequate performance. Financial assurance shall be in the form of one of the following: <br /> (1) Security for Construction of Required Improvements <br /> (a) The permit applicant"shall provide one of the following as surety for the <br /> completion of required improvements: <br /> (i) A performance bond from a surety bonding company authorized <br /> to do business in North Carolina, <br /> (ii) An irrevocable letter of credit or other instrument readily <br /> convertible into cash at face value payable to Orange County or <br /> (iii) Cash placed in escrow with a financial institution designated as <br /> an official depository of Orange County. <br /> Orange County, North Carolina—Unified Development Ordinance Page 6-107 <br />