Agriculture Reference
In-Depth Information
Figure 6. The role of paddy fields as a reservoir promoting a sound water cycle in a basin scale
Outflow from
mountainous
hinterland
Evapo-
Transpiration
Evapo-
transpiration
Outflow from
mountainous
hinterland
Evapo-
transpiration
Canal
Return
flow
Diverted
water
Return
flow
Return flow
River
flow
Minimum
release
obligation
River
flow
River
flow
Head
works
Minimum release
obligation
Head
works
River
flow
Figure 7. Contribution of paddy field irrigation to ecosystem services in humid regions
Ecosystems / Bio-diversity in downstream rivers, marsh and swamps
Abundant River Flow
Co-existent
Moisture necessarily consumed by
crops to grow up
Agricultural Water Use
Remained water in paddies, canals and
ponds serves as a network of wetlands
and water ways
Diverted water and return flow gives positive impact on
the environment
Creating another excellent secondary natural
environment outside the river
Figure 8. Competitive nature of water use in arid regions where water is constantly scarce
Mi ni mum r el eas e?
Ecosystems / Bio-diversity in downstream rivers, marsh and swamps
Limited River
Flow
Competitive
Moisture necessarily consumed by
crops to grow up
Agricultural Water Use
Diverted water
Most of water is evapo-
transpired
Diverted water gives negative impact on the
environment of the downstream river
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