Franson Civil Engineers completed the design of the RCC dam, including stability calculations for sliding and uplift. The RCC dam was capped with conventional concrete and the downstream face was formed to have steps; design of stilling basin which included design of concrete apron, concrete training walls, concrete baffles, and concrete end sill. The stilling basin was designed using the guidelines presented by the U.S. Bureau of Reclamation (USBR) and a 3-D model of the stilling basin was made to ensure that hydraulics were acceptable.
The scope of the project included the following items:
We performed construction observation of all major work including removal of existing structures, construction of all concrete structures, and RCC placement which involved 24-hour shifts; review of submittals and pay requests; coordination with the Federal Energy Regulatory Committee (FERC), PacifiCorp, the USBR, the State of Idaho, the Contractor, and the Client. The project was completed over a very tight schedule through winter and early spring with intermittent harsh weather conditions. Water was delivered to irrigators on time.