Browsing by Author "Innocent, Patrick"

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    Impacts of climate change on irrigation water requirements: a case of Mbarali River catchment-Tanzania.
    (University of Dar es Salaam, 2018) Innocent, Patrick
    Future climate change projections have significant importance in development plans. The main objective of the study was to assess the impacts of climate change on irrigation water requirements in Mbarali river catchment, specifically to quantify the current water abstraction for irrigation, assess the irrigation water requirement for different crops grown in the catchment and evaluate the irrigation water requirement under different scenarios of future climate change. The current water use was estimated from measured discharges using flow measurement tools. Assessment of irrigation water requirements for current condition and future projections for different crops grown in the catchment was done by using CROPWAT 8.0 model. The study revealed that 12 out of 13 identified irrigation schemes abstracted more water for irrigation compared to what is authorized in the water use permits. Under current condition irrigation water requirements for paddy-rice is 3.98 l/s/ha, tomatoes is 3.37 l/s/ha and maize is 6.61 l/s/ha. The future projections of irrigation water requirements for paddy-rice, tomatoes and maize simulated by ACCESS_1 model under RCP4.5 and RCP8.5 scenarios between selected periods in 2050s and 2080s generally showed there will be decreases in irrigation water requirements for all crops except for maize in 2080s. These findings imply that the climate change will decrease the future irrigation water requirement in Mbarali River catchment.