We have calculated the ablation and runoff curves for each of the major watersheds of UIB (Figure 1) to derive the ELA within the respective watersheds for both of the months of July and August. Table 5 provides the results of the calculations. The lower and upper limits of the ELA for a month correspond to the lower and upper limits of the values of αg selected (which are 1:0.0025 m and 1:0.01 m, respectively). From the calculations of the ELA for the months of July and August, we take the averages of the lower and upper limits of the ELA as given in Table 5.

Table 5

Estimated ranges of the ELA for the months of July and August within the individual watersheds of UIB

ELA July (m)
ELA August (m)
Average ELA (m)
WatershedsLower limitUpper limitLower limitUpper limitLower limitUpper limit
Gilgit 5,264 5,675 5,380 5,740 5,322 5,707
Hunza 5,280 5,480 5,280 5,480 5,280 5,480
Shigar 5,080 5,330 5,080 5,330 5,080 5,330
Shyok 6,080 6,200 6,080 6,200 6,080 6,200
Kharmong 5,280 5,510 5,310 5,520 5,295 5,515
Zanskar 5,250 5,500 5,180 5,480 5,215 5,490
Shingo 5,020 5,170 5,020 5,170 5,020 5,170
Astore 4,780 5,100 4,900 5,140 4,840 5,120
ELA July (m)
ELA August (m)
Average ELA (m)
WatershedsLower limitUpper limitLower limitUpper limitLower limitUpper limit
Gilgit 5,264 5,675 5,380 5,740 5,322 5,707
Hunza 5,280 5,480 5,280 5,480 5,280 5,480
Shigar 5,080 5,330 5,080 5,330 5,080 5,330
Shyok 6,080 6,200 6,080 6,200 6,080 6,200
Kharmong 5,280 5,510 5,310 5,520 5,295 5,515
Zanskar 5,250 5,500 5,180 5,480 5,215 5,490
Shingo 5,020 5,170 5,020 5,170 5,020 5,170
Astore 4,780 5,100 4,900 5,140 4,840 5,120

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