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(a) Each applicant must use planning techniques, nonstructural practices, and design methods to implement environmental site design to the maximum extent practicable. The use of environmental site design must be exhausted before any structural best management practice is used. Each stormwater management plan must be designed using ESD sizing criteria, recharge volume, water quality volume, and channel protection storage volume sizing criteria, according to the Design Manual and any applicable regulation. If the Department finds that historical flooding problems exist at the site of a new development or redevelopment project, the Director may require the use of overbank flood protection volume, extreme flood volume criteria, or both.
(b) Unless otherwise indicated, redevelopment is subject to the same requirements that apply to new development under this Article. For redevelopment, the applicant may use alternative stormwater management measures to satisfy the requirements in subsection (a) if the applicant shows that impervious area reduction and environmental site design have been implemented to the maximum extent practicable. In any redevelopment project, the selection and application of environmental site design practices must be consistent with the recommendations, goals, and objectives of any applicable master or sector plan.
(c) Alternative stormwater management measures that may be used for redevelopment include:
(1) an on-site structural best management practice;
(2) an off-site structural best management practice or off-site environmental site design to provide water quality treatment; or