*2.6.5.2 Hadejia-Jama'are Komadugu-Yobe Basin (HJKYB)*

### *2.6.5.2.1 Yobe river at Gashua gauge station*

Precipitation pattern influences river discharge seasonality in the Yobe river. Although the broad seasonal change signal at the Gashua gauge is unaltered by climate change, the climate models median show, considerable increases in river discharge volumes from August to November (**Figure 6**). Discharge volume increased by + 371 m3 /s under RCP8.5 and + 191 m3 /s under RCP4.5 for the four-month period, amounting to about +87% (RCP4.5) and +90% (RCP4.5) of the total increased volumes. Generally, this increase in discharge arises from two climate models (**Figures 7** and **8**): the MIROC-ESM-CHEM and HADGEM-ES result in increased precipitation in the rainy season (July to October).

**Figure 7.** *Absolute change in discharge climatology projected under RCP8.5 for each GCM.*

*Future Climate Change Impacts on River Discharge Seasonality for Selected West African River… DOI: http://dx.doi.org/10.5772/intechopen.99426*

**Figure 8.** *Absolute change in discharge climatology projected under RCP4.5 for each GCM.*

Hydrological projections of NORESM and IPSL-CM5A-LR show minor changes from the reference period, while the GFDL decreases the discharge volume (**Figures 7** and **8**).
