(A) Manmade channels shall be designed and sized to safely convey the 100-year design storm with a minimum of 1 foot of freeboard for sub-critical flow conditions and a minimum of 2 feet of freeboard for supercritical flow conditions.
(B) Right-of-way or easements shall be granted to the city to fully contain the channel plus 15 feet for maintenance/access on each side of the channel.
(C) Development abutting natural unimproved channels shall be setback from the arroyo centerline a prudent distance to allow the arroyo to degrade, a grade and meander. This prudent distance also referred to as the lateral erosion envelope (LEE) line shall be determined by a New Mexico registered engineer based upon proven sediment transport analysis procedures. Rights-of-way or easements shall be granted to the City of Elephant Butte for the arroyo up to the LEE line.
(Ord. 77, passed 1-5-2005)