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Table 7

Results of this study and previous studies

Source	River	Target period	Hydrologic model	Climate model	Scenario	Δ Annual rainfall (%)	Δ Annual streamflow (%)
Study	White Volta	2011–2030	SWAT	HADCM3	A1B	3.0	5.2
Study	White Volta	2011–2030	SWAT	HADCM3	B1	5.4	13.0
Study	White Volta	2046–2065	SWAT	HADCM3	A1B	4.4	8.4
Study	White Volta	2046–2065	SWAT	HADCM3	B1	6.6	15.9
Study	White Volta	2011–2030	SWAT	MPEH5	A1B	−1.1	−2.2
Study	White Volta	2011–2030	SWAT	MPEH5	B1	−1.4	−3.6
Study	White Volta	2046–2065	SWAT	MPEH5	A1B	4.1	10.3
Study	White Volta	2046–2065	SWAT	MPEH5	B1	1.5	3.7
Andah et al. (2003)	Volta	2020–2039	WEAP	HADCM3	A2	8.0	27.0
Andah et al. (2003)	Volta	2020–2039	WEAP	HADCM3	B2	10.0	34.0
Andah et al. (2003)	Volta	2070–2099	WEAP	HADCM3	A2	6.0	13.0
Andah et al. (2003)	Volta	2070–2099	WEAP	HADCM3	B2	9.0	34.0
Obuobie (2008)	White Volta	2030–2039	SWAT	ECHAM4-MM5	IS92a	6.0	33.0
Jung (2006)	Volta	2030–2039	WaSIM	ECHAM4-MM5	IS92a	5.0	17.0
Jung (2006)	White Volta	2030–2039	WaSIM	ECHAM4-MM5	IS92a	5.0	22.3
Kankam-Yeboah et al. (2013)	White Volta	2006–2035	SWAT	ECHAM4-CSIRO	A1F1	−12.3	−22.0
Kankam-Yeboah et al. (2013)	White Volta	2036–2075	SWAT	ECHAM4-CSIRO	A1F1	−19.6	−50.0
Awotwi et al. (2015)	White Volta	2030–2043	SWAT	REMO	A1B	8.0	26.0

Source	River	Target period	Hydrologic model	Climate model	Scenario	Δ Annual rainfall (%)	Δ Annual streamflow (%)
Study	White Volta	2011–2030	SWAT	HADCM3	A1B	3.0	5.2
Study	White Volta	2011–2030	SWAT	HADCM3	B1	5.4	13.0
Study	White Volta	2046–2065	SWAT	HADCM3	A1B	4.4	8.4
Study	White Volta	2046–2065	SWAT	HADCM3	B1	6.6	15.9
Study	White Volta	2011–2030	SWAT	MPEH5	A1B	−1.1	−2.2
Study	White Volta	2011–2030	SWAT	MPEH5	B1	−1.4	−3.6
Study	White Volta	2046–2065	SWAT	MPEH5	A1B	4.1	10.3
Study	White Volta	2046–2065	SWAT	MPEH5	B1	1.5	3.7
Andah et al. (2003)	Volta	2020–2039	WEAP	HADCM3	A2	8.0	27.0
Andah et al. (2003)	Volta	2020–2039	WEAP	HADCM3	B2	10.0	34.0
Andah et al. (2003)	Volta	2070–2099	WEAP	HADCM3	A2	6.0	13.0
Andah et al. (2003)	Volta	2070–2099	WEAP	HADCM3	B2	9.0	34.0
Obuobie (2008)	White Volta	2030–2039	SWAT	ECHAM4-MM5	IS92a	6.0	33.0
Jung (2006)	Volta	2030–2039	WaSIM	ECHAM4-MM5	IS92a	5.0	17.0
Jung (2006)	White Volta	2030–2039	WaSIM	ECHAM4-MM5	IS92a	5.0	22.3
Kankam-Yeboah et al. (2013)	White Volta	2006–2035	SWAT	ECHAM4-CSIRO	A1F1	−12.3	−22.0
Kankam-Yeboah et al. (2013)	White Volta	2036–2075	SWAT	ECHAM4-CSIRO	A1F1	−19.6	−50.0
Awotwi et al. (2015)	White Volta	2030–2043	SWAT	REMO	A1B	8.0	26.0