AQWC Restoration - Feasibility Study
Client: USBR (sub-consultant to AES)
The objective of this study was to evaluate the suitability and cost-effectiveness of maintaining the Aha Quin West Channel (AQWC) as an open water backwater channel with associated wetlands. Hydrology and sedimentation issues have demonstrated over time that the AQWC site is not self-sustaining and requires frequent and costly maintenance to continue to provide the originally intended function.
Four different models were used in this study.
The proposed scenarios for the AQWC included the dredging to reach two different bottom profiles, a retention basin to reduce sediment load from the Manson Wash ephemeral flows, and a sedimentation basin at the upstream end. An off-site mitigation channel was also proposed. Extend of open water and wetland areas were determined for all cases. A cost analysis at conceptual design level was also conducted.
The suitability and cost-effectiveness evaluation of the different scenarios lead to some recommendations that are helping the stake holders in their decisions.