Abstract
1. The tunnel for diversion of the Angren River, constructed in 1971 for the first stage of operation, was designed in accordance with the then existing instructions [3]. 2. Publication of the new Instructions on the Design of Hydraulic Tunnels [5] made it possible to eliminate construction of the reinforced gunite ring planned for the second stage of construction, which saved 500,000 rubles. 3. The design of a similar pressure tunnel according to the new instructions [5] would save more than 1,300,000 rubles due to a reduction in the lining thickness and weigh of reinforcement, and the use of lightweight timbering of sprayed concrete and anchors instead of a protective roof.
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