) In the center of the Main Harvest channel there is On the bottom part a conical exit for the fish which is needed to allow a smooth exit of fish. This exit requires a socket that allows installation of a net(#4) on the opening that is smooth and without bumps on the bottom of the channel.5) In the center of the Main Harvest channel On each side of the conical exit there are Double rails(1.4) hold the STOP LOG(#9)On the other side, the rigid net (#6) (GRADING) GRP The double rails(1.4) and Penstock valves(#9) need to withstand hydraulic load of a full tank (filled to the top)6) Entry holes will be made on site as per Location of the entry pipe diameter 110mm SDR17, the connection is with socket coupling(#10) with gasket Laminated to the wall. B. Secondary Harvest Channel1) At the exit from the Secondary Harvest Channel, where it connects to the Main Harvest Channel, there are double rails (1.4) installed. At the side facing the Main Harvest Channel, a Stop Log is installed(#7) . Also, on the rail that faces the Secondary Harvest Channel, a rigit Net (#8) is installed. 2)Entry holes will be made on site as per Location of the entry pipe diameter 90mm SDR17, the connection is with socket coupling(#11) with gasket Laminated to the wall.