(1) All drainage in and through the subdivision shall be the responsibility of the subdivider.

(2) The subdivider may divert or enclose the natural drainage in and through the subdivision after providing a drainage system plan that is approved by the city engineer. The subdivider shall bear all costs associated with diverting or enclosing natural drainage.

(3) All storm drainage in city streets shall drain from the asphalt to concrete gutters, then to approved stormwater facilities such as catch basins and drywells. All stormwater between stormwater treatment facilities shall be in underground pipes.

(4) The city may require the subdivider to install street drainage facilities that are over and above the subdivision requirements, to provide for storm sewer service to areas other than the subdivision. The city will negotiate the installation of additional street drainage facilities, and reimburse the subdivider for the additional cost after construction is complete and accepted by the city council. No approval is authorized by the city unless a written approval for reimbursement by the city is sent to the subdivider prior to construction.

(5) Washington State Department of Ecology approval is required for all stormwater facilities before construction plans will be approved. (Ord. 411 § 1, 2008)