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Q.

What is meant by Lake Tapping...??

Tags: travel, education, environment
Asked by Manoj Joshi, 26 Apr '12 04:07 pm
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Answers (2)

 
1.

Lake tapping is a method of blasting an intake into a body of water from below the natural water surface without first lowering that surface or Installing a protective cofferdam around the tap hole. Lake taps are done by first excavating a tunnel almost to the water/rock contact and then blasting out the final protective rock plug at one time to allow water to suddenly inflow into the tunnel from the lake. This procedure can be done "dry" or "wet." In the dry method the tunnel is empty of water before the final plug blast while in the wet method it is partially filled with water. This paper describes a wet method lake tap as performed at Alaska Power Authority's Tyee Lake Hydroeletric Project in southeast Alaska. The Tyee Lake project is located approximately 40 miles southeast of Wrangell, Alaska, in a glacially formed valley called the Bradfield Canal. The project consists of a powerhouse located at sea level on the canal, a system of tunnel s and shafts connecting the powerhouse to ...more
Answered by Ataur Rahman, 26 Apr '12 04:10 pm

 
  
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2.

Lake tapping is a method of blasting an intake into a body of water from below the natural water surface without first lowering that surface or Installing a protective cofferdam around the tap hole. Lake taps are done by first excavating a tunnel almost to the water/rock contact and then blasting out the final protective rock plug at one time to allow water to suddenly inflow into the tunnel from the lake.............
Answered by pradeep mishra, 26 Apr '12 04:14 pm

 
  
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