Engineers outline Coconino Wash dam and large basins; Middle Wash excavation would require tree removal
Consultants explained a 25‑foot flood‑retarding dam on Coconino Wash with 500–600 acre‑feet storage and large excavated basins (not embankments) at Middle Wash that would require significant dirt removal and clear‑cutting; they warned even full implementation will not eliminate all flood risk in a 100‑year event.
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Consultants described the Coconino Wash Flood Retarding Structure (FRS) as a major upstream element intended to reduce peak discharges so the Town’s new storm drain system can handle flows. "A large‑scale 25‑foot‑tall dam creating a basin that can impound 500–600 acre‑feet of water" was presented as the conceptual capacity, and the FRS is being pursued on a separate permitting and design track requiring state and federal approvals.
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