IMPACT OF INTENSIFYING IRRIGATION DEVELOPMENT AND IMPLICATIONS FOR SUSTAINABLE WATER RESOURCES MANAGEMENT IN THE WHITE VOLTA SUBBASIN - Sustainable Irrigation Development in the White Volta Sub-Basin - page 189

Figure 8.3: Validated streamflow; a) Atankwidi; b) Yarigatanga
The lack of adequate data is the major reason for the errors encountered in
the hydrological model. However, since the objective of the study is to look
at the impact of irrigation, the results on irrigation impact can be relied
upon.
8.3.6 Reference scenario
The ‚Current Account‛ year is the base year of the model where data is
added. A ‚Reference‛ scenario is established from the Current Account to
simulate likely evolution of the system without intervention. After using
rainfall and streamflow values of 2005/2006 to calibrate the model, the
Current Account was modified to use long-term mean rainfall values for the
streamflow generation. The long-term annual rainfall is then modified
annually over the projected study period using the water year method to
depict predicted climatic variations.