11/29/2023 0 Comments Eddy pump dredgePumps for dredging service are constructed of high-strength, abrasion-resistant alloy steels. The pump consists of a rotor in a volute with a suction nozzle and discharge outlet. ![]() The novel EDDY Pump is a physically simple machine that belies its advanced hydrodynamic design and performance. The owner, concerned that conventional dredging equipment would be unable to meet these restrictive standards, identified the EDDY Pump dredging technology as an alternative that might both meet the environmental standards and economically dredge large volumes of sediment. For production dredging, the Regional Water Quality Control Board (RWQCB) proposed the upper limit for turbidity at 25 NTU above the background level and limited total suspended solids (TSS) to 80 mg/1 regardless of the background level. The owner’s present plan calls for limited dredging at the dams followed by a controlled passage of sediments downstream during flood flows. All of these options involve potential environmental impacts which could adversely affect the aquatic and terrestrial ecology of concern to the regulatory agencies. Clamshell and hydraulic suction dredging with sediment disposal by truck, rail or slurry pipeline to distant landfill sites were considered. and at the similar Rock Creek Reservoir located upstream. Since 1984, the owner of Cresta Reservoir has evaluated a number of methods to address sediment problems there. The 8-inch cable hanging dredge pump was used to remove sand for this expansion project. The maximum turbidity of the discharge plume was only 12 Nephelometric Turbidity Units (NTU) over ambient.Ģ017 Project – Canal Locking System Project. ![]() Production rates of over 230 cubic meters per hour were observed. Slurry densities greater than 70 percent solids by weight were sustained, while peaks over 90 percent were achieved. It was concluded that the dredge performance exceeded the manufacturer’s production specifications and easily complied with restrictive water quality standards. Turbidity, suspended solids, dissolved oxygen, flow, the density of the slurry, and production rate were monitored. The sediments jeopardize the reliable operation of the dam and the 70,000 kW Cresta Powerhouse by obstructing reservoir outlets, The owner has conducted a number of comprehensive studies investigating sediment management alternatives for the reservoir since the mid-1980s.įor the EDDY Pump demonstration, approximately 7,833 cubic meters of sandy sediment deposits near Cresta Dam were dredged and returned to the reservoir bottom 600 meters upstream. The reservoir, located on the North Fork Feather River in Plumas County, has accumulated approximately 2.3 million cubic meters of sediment, filling almost half its total capacity since it was placed in service in 1949. WEINRIBĪ demonstration test of a new environmentally friendly slurry dredging technology using the “EDDY Pump,” a patented vortex slurry pump, was performed in 1994 at Cresta Reservoir in northern California to verify its performance capabilities and to determine the potential environmental impacts of proposed dredging. ![]() EDDY Pump Dredging Demonstration at Cresta Reservoirīy LARRY L.
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