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County engineers: stormwater on Ocotillo Road follows historic ravines; gravel pit appears to detain, not divert, runoff
Summary
Engineering staff told the Board of Supervisors that contour maps and lidar show ravines that carry stormwater to Desert Rose and across Ocotillo Road; the gravel pit near the ridge appears to retain stormwater rather than increasing flow across the road, and the wash does not meet the county's 500 cubic-feet-per-second regulatory threshold.
Cochise County engineers told supervisors that recent inspections and contour mapping indicate stormwater in the Ocotillo Road area follows longstanding ravines and that the excavated pit on the ridge is retaining stormwater rather than increasing flows across Ocotillo Road.
Jackie Watkins, the county engineer, showed supervisors contour maps based on 2020 LiDAR and explained the location of two principal ravines upstream of property owner Michael (Mr.) Durham’s house. Watkins said the disturbed area at the pit is about 800 feet to the property line and roughly 1,000 feet to Ravine Number 1, and she…
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