THE ANALYSIS OF WATER RELEASE FROM THE HYDRO ACCUMULATION LAKE MODRAC WITH SPILLWAY CURVE AND VOLUME CURVES

Abstract

Dam Modrac is multiple arched reinforced concrete buttress dam, with nine buttresses and ten arches,
which by its technical characteristics and volume of the accumulation is considered as one of the high
dams. Crown level of spillway is 200.00 m a.s.l. Crest length is 205.00 m, while the maximum height is
27.50 m. To control the water level in the reservoir, under normal hydrological conditions, there are
four basic discharges with maximum capacity around Q = 77 m3/s for the projected state. The paper
gives an analytical expression of the spillway curve and analytical expressions of amounts of water
discharge separately for each bottom outlet, which are obtained by conducted measurings. Special
significance of this paper gives volume curves for hydro accumulation Lake Modrac for projected state
and the period of use of the system.