Location: San Xavier District, Tohono O’odham Nation, Arizona
(Project “stats” off to the side):
-6,000 ft of Channel and Berm
-215 acres of floodplain modeled
–24” D50Rock Riprap Armoring
The natural watercourse of several braided washes caused significant incising and erosion of theexisting containment earthworks which led to onsite waste rock stormwater comingling with offsite stormwater. Achannel and levee system was designedto contain the waste rock runoffand safely divert offsite stormwater around the waste rock dump.The levee was armored with large riprapto protect against the sediment–laden highly erosive flowsthat occur onsite. In-depth hydrologic and 2D hydraulic modeling was performed to estimate peak flows and design the levee system. The end product for the client was a cost effectivedesign using on-site materials that complied with requirements set forth in the Section 404 permit issued by the U.S. Army Corp of Engineers.