Figure 1. Schematic of nodal network.
The demand node (node 3) is made up of a total
irrigable land of 30,000 Ha with a potential for
growing six crops (maize, wheat, canola. rice,
oats and barley). Groundwater pumping from the
irrigable area is permitted to satisfy crop water
demand if surface water supplies are not
sufficient. Each of these crops is characterized by
crop water requirements and growing period
within the year. The continuity equation (4) was
recast for the example problem as: