Agriculture Reference
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The analysis looks at two scenarios where groundwater recharge is reduced
by 10% and 20%. This analysis is performed on the scenario in which the
threshold for sustainable groundwater irrigation was achieved.
In the results (Figure 8.12), an unsustainable condition is experienced in the
groundwater storage of Yarigatanga and Anayari catchments for both
scenarios, meaning that the sustainability of groundwater irrigation
development is sensitive to the groundwater recharge rate.
8.4.5 Water Balance Analysis of Scenarios
In the scenarios modelled so far using WEAP, all results are based on
calculations internal to the model. To verify the model results simple water
balances on all scenarios were calculated.
Definition of Symbols
P = Precipitation
ER = Evaporation from surface water
reservoir
EGI = Evaporation from Groundwater
irrigation
ESI = Evaporation from surface water
irrigation
EV = Evaporation from surrounding
vegetation
SR = Surface water reservoir storage
GR = Groundwater storage
GI = Groundwater irrigated fields
Figure 8.13
: Water Balance of the catchment.
The water balance analysis is based on Figure 8.13 and is performed at 3
levels: the catchment level which is considered as closed with no outside
inflows, and the irrigation level for both surface water and groundwater. The
general water balance used is:
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