GENERAL INFORMATION
Lake Sarez is situated on the territory of the Gorno-Badakhshan Autonomous
Oblast of the Republic of Tajikistan in the Amudaria River Basin on the
right-bank tributary of the River Pianj - the Bartang (Murgab) 143 km from
its mouth. The seismic zoning map of 1981 defines it as a 9.0 scale
zone. Tremors of this scale occur in the area once in 2000 years while 7.0
scale earthquakes occur once in 100 years. The lake emerged in 1911 as a
consequence of a 9.0 scale earthquake that triggered a landslide blocking
the river. ("Engineering-Geological, Topographic, Geodesic and
Geophysical Research Carried Out in the Area of Lake Sarez. Analysis and
Recommendations. Institute of Earthquake Engineering and Seismology of the
Academy of Sciences of the Republic of Tajikistan")
At present, Lake Sarez has the following parameters:
length of the lake - 55,8 km
absolute elevation of the lake surface - 3,263m
maximum width of the lake - 3,3 km
average width - 1,44 km
maximum depth - 499,6m
average depth - 201,8m
perimeter of the lake banks - 161,9 km
lake surface - 79,64 km2
influx balance - 47,1 m3/s=1487 m m3/year
surge balance- 47,7 m3/s=1505 m m3/year
maximum seasonal fluctuation of the lake level - 12 m
beginning of filtration - April 1914
attainment of maximum level - 1978, a higher level -
1994 (approx. 3270m)
evaporation from the surface - 2,1 m3/s=67,6
m m3/year
maximum vaiving rate - - 20 cm/year
maximum water volume -16,074 km3 .
Usoy Dam parameters:
height of the dam from the lake bottom - 567m
height of the lowest point from the lake surface - 38m
average height above water level - 67m
dam volume - 2.2 km3
length of the dam - 5 km
average width of the dam - 3,2 km
mass of the dam - 6 billion tons
absolute elevation of the lake surface - 3,263m
beginning of filtration - April 1914
attainment of the maximum level - 1978 and 1994
length of the dam from the low part of the breakaway wall to the
root slope - 5,200
length of the dam from the upper to the low pool - 3,750m
width of the upper pool - 3,150m
dam surface - 10,8km2
maximum elevation point - 3,496.1m
minimum - 3,315.0m
absolute lowest part of the dam in the right abutment -3,290-3,300m
absolute point of the canyon head at water exit - 3,119.1m
elevation difference between the lake level and the water exit point
through the dam into the canyon- 148.2m
number of springs - 57 |
