§ 30-357. Drainage.

(a)

Sufficient drainage rights-of-way or easements shall be provided to adequately accommodate the 100-year flows entering into, passing through, and exiting from the development. In the event that the subdivision is traversed by or is contiguous to any lakes, washes, streams, or other bodies of water, the subdivider shall provide adequate rights-of-way or easements for storm drainage, conforming substantially with the lines of such natural watercourses, channels, streams, or waterways, or provide for an acceptable realignment of said watercourses. Adequate drainage rights-of-way or easements shall also be provided for all drainage-related improvements or watercourses necessary, to ensure that all lots within the development are free from a 100-year storm event impact, and that the creation of this development will not adversely impact the drainage on upstream, adjacent, or downstream properties.

(b)

Any significant drainage channels or watercourses deemed by the county engineer to be necessary for public purposes shall be designated as drainage parcels and dedicated to the public for drainage purposes.

(c)

All drainage channels, watercourses, or drainage-related improvements shall be designed and constructed to withstand the impact of the 100-year storm, be in accordance with the drainage design manual for the county and county flood control ordinance, and any requirements, amendments or specifications adopted thereof, and any standards and specifications adopted thereof.

(d)

All developments will provide adequate space and mechanisms to retain all on-site flows generated by the developed condition. Detention/retention of on-site flows generated by the proposed development will not exceed pre-developed flows impacting the development site.

( Ord. No. 2001-01 , § 5.2(E), 2-20-2001; Ord. No. 2004-04 , § 5.2(E), 12-6-2004; Ord. No. 2010-06 , § 5.2(E), 4-5-2010)