Wahiawa Dam Rehabilitation

The Wahiawa Dam Rehabilitation project involves the rehabilitation of the Wahiawa Dam to bring it into compliance with State Dam Safety Program regulations. The project includes clearing and grubbing, topsoil stripping and stockpiling, excavation of portions of the existing dam embankment, dewatering and flow diversion, construction of a filter blanket, drain, and downstream embankment, spillway demolition and construction, and topsoil placement and seeding. The project requires the contractor to comply with all applicable state and federal statutes, including those related to erosion and sediment control, and to obtain necessary permits and approvals. Some key features of the project include: • The construction of a new spillway and spillway approach channel • The installation of a parapet and debris boom anchors • The placement of riprap on the upstream dam embankment • The installation of instrumentation and fencing • The completion of minor site work and site restoration The project is expected to be completed in several phases, with the first phase involving the temporary drawdown of the reservoir, followed by the construction of the new spillway and other features. The project requires careful planning and execution to ensure compliance with regulatory requirements and to minimize environmental impacts.