Environmental Engineering Reference
In-Depth Information
Fig. 9.1
Boundary of the Heihe River watershed
Spotty oases appear intermittently along the streams, lakes, and irrigation ditches.
Since it is extremely dry, the Alashan Highland is a large source of frequent
sandstorms (Cheng et al.
1999
; He et al.
2009
).
The total annual water withdrawal in the Heihe in 1995 was about 3.36 billion
(10
9
)m
3
and 86 % of that was used to irrigate over 288,000 ha of farmland mainly
located in the Hexi Corridor (Pan and Qian
2001
; He et al.
2009
), leaving less than
0.5 billion (10
9
)m
3
of annual flow to the lower reach (north of the Zhengyixia Gage
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