Chu and Parechu basins are 5009, 992 and
663 km, respectively (Table 16.2).
16.6.1.4 Mean Stream Length (Lsm)
The mean stream length is calculated as the
ratio of total stream length of particular order
with a number of streams of a segment of that
order (Strahler 1964). The Lsm ranges from
0.50 to 0.84 km within the study area
(Table 16.2). Lsm of any given order is greater
than that of the lower order and less than that of
its next higher order up except first order of
Spiti and fourth order of Tsarap Chu and
Parechu.
Fig. 16.5 Split drainage of Spiti river basin. Source Computed from SRTM
0
500
1000
1500
2000
2500
3000
3500
1
2
3
4
5
6
7
Number of Stream
Spiti River Basin
Stream Order
0
100
200
300
400
500
600
700
1
2
3
4
5
Tsarap Chu River Basin
Number of Stream
Stream Order
0
100
200
300
400
500
1
2
3
4
5
Parechu River Basin
Number of Stream
Stream Order
Fig. 16.6 Stream order versus stream number. Source Compiled by author
0
500
1000
1500
2000
2500
3000
1
2
3
4
5
6
7
Spiti River Basin
Stream Length
Stream Order
0
100
200
300
400
500
600
1
2
3
4
5
Tsarap Chu River Basin
Stream Length
Stream Order
0
50
100
150
200
250
300
350
400
1
2
3
4
5
Parechu River Basin
Stream Length
Stream Order
Fig. 16.7 Stream order versus stream length. Source Compiled by author
220
A. Husain and P. Kumar