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Water resource modelling for the Lake Tana sub-basin using the Mike Basin model for current and future water resource development scenarios

Asegdew G. Mulat

Journal of Water and Land Development | 2021 | No 48 | 215-224 | DOI: 10.24425/jwld.2021.136164

Keywords development scenarios Lake Tana subbasin Mike Basin model modelling reservoir operation water resource

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Abstract

Rainfall in the Lake Tana basin is highly seasonal and the base flow contribution is also low resulting in the need for reservoirs to meet the agricultural demand during the dry season. Water demand competition is increasing because of in-tense agricultural production. The objective of this study is to develop water balance models. The Mike Basin model has been selected for water allocation modelling and identifying potential changes needed to the existing water allocation scheme to reduce the stress due to increased water demand. The study considers baseline and future development scenarios. The construction of new dams results in two competing effects with respect to evaporation loss. The first effect is increased evaporation from new reservoirs, while the other is reduced evaporation from the Lake Tana as a result of a decreased sur-face area of the lake and reduced inflow of water to the lake. Once a dam is built, there will be an additional free water sur-face area and more evaporation loss. In dry months from January to May, the irrigation water demand deficit is up to 16 Mm3. It is caused by reservoirs built in the basin, which reduce the inflow to the Lake Tana. The inflow varies between wet and dry months, and there is more water flow in wet months (July, August and September) and reduced flow in dry months because of the regulatory effects produced by the reservoirs.

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Authors and Affiliations

Asegdew G. Mulat

Bahir Dar University, Bahir Dar Institute of Technology, Faculty of Civil and Water Resource Engineering, P.O. Box. 26, Bahir Dar, Ethiopia

Application of MIKE SHE software for estimation of groundwater recharge in Ogun and Oshun basins, southwestern Nigeria

Muritala O. Oke

Journal of Water and Land Development | 2020 | No 45 | 86-93 | DOI: 10.24425/jwld.2020.133049

Keywords groundwater recharge hydrological parameters meteorological parameters MIKE SHE model Ogun basin Oshun basin

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Abstract

MIKE SHE software was used to estimate recharge into the aquifers of Ogun and Oshun Basins. Abeokuta within the Ogun Basin and Oshogbo in the Oshun Basin are subdivided vertically into two components: atmosphere, and unsaturated zone. The atmosphere zone comprises of rainfall and potential evapotranspiration, while the unsaturated zones, comprises of the Basement Complex and Sedimentary rock. Daily records from two rainfall stations, Oshogbo station (2008–2011) and Abeokuta station (2010–2014) water years were obtained for simulation of groundwater recharge processes using MIKE SHE model. The simulation results showed that daily groundwater recharge is influenced by rainfall and ranges from 0 mm∙day–1 in January when there was an insufficient rainfall in the two stations to 10.89 mm∙day–1 in Abeokuta and 29.85 mm∙day–1 in Oshogbo in the month of August when the soils had attained field capacity. The study found out that there are more daily groundwater recharge in Oshun basin compared to that of Ogun basin. This was alluded to more rain-fall and less evapotranspiration recorded at Oshun basin as compared to Ogun basin coupled with the sedimentary soil which allows more movement of water into the aquifer of the basin. It is recommended MIKE SHE model should be used to estimate recharge in other basins in Nigeria and Africa for quick and effective daily recharge calculations to permit better and scientific decision making in these areas.

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Muritala O. Oke

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Water resource modelling for the Lake Tana sub-basin using the Mike Basin model for current and future water resource development scenarios

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Application of MIKE SHE software for estimation of groundwater recharge in Ogun and Oshun basins, southwestern Nigeria

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Authors and Affiliations