Abstract :
In Bahcelik Dam, irrigation and drinking water is discharged from the bottom
outlet to diversion channel when the reservoir water surface elevation is between 1472 m and
1500 m. It was planned that the
ow discharge would be automatically controlled by the
valves depending on the water demand. In this system, the valve type is characterized
by opening, closing, and regulating times of the valves for controlling system placed
downstream of the main diversion channel. Howell-Bunger valves, which are cavitation
and water hammer resistant, velocity limitless, and electronically controllable water control
systems, were selected. In the experimental study, 4 Howell-Bunger valves each having
D = 1400 mm and maximum discharge capacity Q = 8:5 m3/s were placed at the upstream
part of the main diversion channel and tested in various valve openings to obtain optimum
operating conditions for all reservoir water levels in a 1/10 scaled model. It was found
that as the reservoir elevation got higher, valve performance increased by up to 75% of
valve opening. The expected discharge capacity of a valve, which worked in 100% open
condition, was 8.5 m3/s; however, this value was reached with two valves that worked in
100% opening at the minimum reservoir operation level, i.e. H = 1472 m.
