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Sutlej River Catchment (up to Kasol gauge station) as shown in Figure 1, has an approximate area of 51,071.39 km2. The whole basin has been delineated into 23 sub-basins (Table 1). It is situated between ∼76.82 ° E to ∼82 ° E and 33.2 ° N to 30.57 ° N co-ordinates. The rivers in the watershed are mostly fed by snowmelt and rainfall during summer when the temperature remains comparatively high. Most of the study area, especially the middle and upper portion fall in the greater Himalayan range. Due to high altitude and variability in precipitation, very diverse climatic conditions are observed throughout the study area. The lower part of the basin has a tropical and warm temperate climate whereas the middle and upper portion has a very cold climate. Annual average precipitation varies in the range of ∼299 mm to ∼1,273 mm with mean of ∼548 mm in the period 1989 to 2005. The whole basin is dominated by barren (∼39%), shrubs (∼26%), snow and glacier (∼24%), water (∼3.7%), and forest (∼3.3%) (Singh et al. 2015).
Table 1

Details of study area of Sutlej River Catchment (up to Kasol gauge station)

Sub-basinArea (km2)LatitudeLongitudeElevation (m)Minimum elevation (m)Maximum elevation (m)
2,977.86 32.274 78.057 4,967.59 3,438 6,649 
6,491.71 32.788 78.444 5,099.54 3,127 6,658 
1,237.83 31.955 77.971 4,849 3,440 6,378 
976.42 32.081 78.375 4,623.36 3,127 6,540 
573.53 31.914 78.614 4,416 2,555 6,694 
4,433.27 32.148 79.251 4,827.86 3,666 6,144 
1,046.73 31.766 78.858 4,538.93 2,555 6,712 
472.11 31.707 79.140 4,345.86 3,181 5,477 
1,047.32 31.464 78.959 4,814.96 3,181 6,064 
10 702.46 31.353 79.297 4,802.16 3,666 6,152 
11 1,999.4 31.616 79.666 4,625.64 3,666 6,260 
12 2,981.52 31.644 78.463 4,407.96 1,885 6,542 
13 632.44 31.366 79.429 4,668.08 3,666 6,174 
14 1,075.48 31.652 79.821 4,454.74 3,869 5,947 
15 1,075.88 31.301 78.472 4,587.54 1,838 6,417 
16 4,476.19 31.41 77.529 2,420.43 526 5,783 
17 6,847.95 31.177 80.057 4,754.76 3,869 6,973 
18 2,102.85 30.906 80.905 4,946.82 4,299 6,158 
19 1,063.35 30.713 81.114 4,745.24 4,589 5,931 
20 2,575.66 30.469 80.669 4,840.04 4,299 6,107 
21 2,628.90 30.924 81.538 5,116.58 4,589 6,685 
22 1,901.42 30.72 81.928 5,164.32 4,593 6,048 
23 1,751.12 30.562 81.681 5,051.48 4,593 6,857 
Sub-basinArea (km2)LatitudeLongitudeElevation (m)Minimum elevation (m)Maximum elevation (m)
2,977.86 32.274 78.057 4,967.59 3,438 6,649 
6,491.71 32.788 78.444 5,099.54 3,127 6,658 
1,237.83 31.955 77.971 4,849 3,440 6,378 
976.42 32.081 78.375 4,623.36 3,127 6,540 
573.53 31.914 78.614 4,416 2,555 6,694 
4,433.27 32.148 79.251 4,827.86 3,666 6,144 
1,046.73 31.766 78.858 4,538.93 2,555 6,712 
472.11 31.707 79.140 4,345.86 3,181 5,477 
1,047.32 31.464 78.959 4,814.96 3,181 6,064 
10 702.46 31.353 79.297 4,802.16 3,666 6,152 
11 1,999.4 31.616 79.666 4,625.64 3,666 6,260 
12 2,981.52 31.644 78.463 4,407.96 1,885 6,542 
13 632.44 31.366 79.429 4,668.08 3,666 6,174 
14 1,075.48 31.652 79.821 4,454.74 3,869 5,947 
15 1,075.88 31.301 78.472 4,587.54 1,838 6,417 
16 4,476.19 31.41 77.529 2,420.43 526 5,783 
17 6,847.95 31.177 80.057 4,754.76 3,869 6,973 
18 2,102.85 30.906 80.905 4,946.82 4,299 6,158 
19 1,063.35 30.713 81.114 4,745.24 4,589 5,931 
20 2,575.66 30.469 80.669 4,840.04 4,299 6,107 
21 2,628.90 30.924 81.538 5,116.58 4,589 6,685 
22 1,901.42 30.72 81.928 5,164.32 4,593 6,048 
23 1,751.12 30.562 81.681 5,051.48 4,593 6,857 
Figure 1

Study area of Sutlej River Catchment (up to Kasol gauge station) (sub-watersheds are marked by numbers).

Figure 1

Study area of Sutlej River Catchment (up to Kasol gauge station) (sub-watersheds are marked by numbers).

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