(a)

Ravines/drainageways, category A. Open drainage channels defined as category A drainages within section 37-3 of this Code may be altered, relocated, or improved and shall maintain the estimated flow of storm water throughout the channel. Improvements may include the use of pipes, culverts, or concrete lining. Relocation or improvement of a category A drainage shall be reviewed by the city engineer, and may not commence without the engineer's approval.

(b)

Ravines/drainageways, category B. Open drainage channels defined as category B drainages within section 37-3 of this Code shall not be altered, improved, or relocated without approval of the Lewiston Planning and Zoning Commission. Alteration, modification, relocation, or construction within category B drainage channels shall require a conditional use permit.

(Ord. No. 4344, § 2, 11-17-03)