This week our
crews started installation of two drainage pipes which are 100 feet long and 18
inches in diameter. Why are these important?
A major component
of earthen fill dams is to control water seepage. Seepage occurs with the continuous
movement of water around and through the dam. Earthen fill dams are designed
with filter drain materials. The new Calaveras Dam will have filter drains composed
of sands and gravel materials, which are being imported to the project site. The filter drains collect the seepage. The water
goes into the drainage pipes shown below and flows to a weir building, where it
is measured continuously to ensure water is passing safely. Eventually the
water will flow downstream to the nearby creeks. The completion of the
Calaveras Dam is critical to restore the Calaveras Reservoir to its historic storage
capacity of 31 billion gallons of water storage for the Hetch Hetchy Regional
Water System.
Perforated
Pipes being installed adjacent to the inspection well for the new Calaveras Dam
Installation of drainage
pipes below the new spillway for the Calaveras Dam Replacement Project
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