The bottom end of plunge pool needs to be blocked off before dewatering can start. The starting end of an 8' high Aquadam® is placed on the bank and water is pumped into it. This will close off the bottom end of the plunge pool, separating it from the Mokelumne River.
Because the water flow has previously been diverted, this installation is easy. It required nobody to hold back the Aquadam® because no artificial water head will be created against the sides of it.
Water depth is 5'.
Not shown: Aquadam® continues to unroll and inflates, blocking off plunge pool from the river. Later, dewatering takes place. The entire project takes only 10 hours. 4 of those hours were spent placing the stream diversion flow pipes around the plunge pool.
