Assessment of water availability for competing uses using SWAT and WEAP in South Phuthiatsana catchment, Lesotho

Maliehe, Motlatsi; Mulungu, Deogratias M.M.

doi:10.1016/j.pce.2017.02.014

Cited by 33 publications

(20 citation statements)

References 17 publications

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“…Due to data limitations, the short flow records from 2005 to 2015, which include both drier and wetter years, recorded at gauging stations 1G1 and 1H8, were chosen to evaluate the model performance. This approach has also been used to evaluate model performances in the Didessa sub-basin [7] and the South Phuthiatsana catchment [24]. The model stream flows were manually calibrated by altering the model parameters (through trial and error) to have the best fit between the simulated and observed flow [23].…”

Section: Model Performancementioning

confidence: 99%

The Impacts of Water Demand and Its Implications for Future Surface Water Resource Management: The Case of Tanzania’s Wami Ruvu Basin (WRB)

Miraji

Liu

Chen

2019

Water

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River basins around the world face similar issues of water scarcity, deficient infrastructure, and great disparities in water availability between sub-regions, both within and between countries. In this study, different strategies under the Water Evaluation and Planning system (WEAP) were assessed to mitigate water overuse practices under the Current Trend (CT), Economic Growth (EG), and Demand Side Management (DSM) scenarios in relation to current and future statuses of Tanzania’s Wami Ruvu Basin (WRB). The results show that neither domestic nor irrigation water demand will be met based on the current trend. Under the CT scenario, the total water demand is projected to rise from 1050.0 million cubic meters in the year 2015, to 2122.9 million cubic meters by the year 2035, while under the DSM scenario the demand dropped to 990.0 million cubic meters in the year 2015 and to 1715.8 million cubic meters by the year 2035. This study reveals that there is a positive correlation between the highest surface runoff events and the highest unmet demand events in the basin. Terrestrial water demand alters the hydrological cycle of a catchment by modifying parameters such as surface runoff, particularly in small catchments. The results of this study prove that DSM strategies are more amenable to mitigate the impacts and implications of water demand, as they increase water sustainability and ensure ecosystem security by reducing the annual water demands and surface runoff by 15% and 2%, respectively.

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Section: Model Performancementioning

confidence: 99%

The Impacts of Water Demand and Its Implications for Future Surface Water Resource Management: The Case of Tanzania’s Wami Ruvu Basin (WRB)

Miraji

Liu

Chen

2019

Water

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“…The hydrograph of observed and simulated monthly streamflow after SWAT model calibration showed inconsistency in prediction of streamflow peaks as simulated in the lower Aswa basin, in Northern Uganda [100]. Inability to capture peaks in simulations was also recorded in a SWAT study conducted for assessing water availability for competing uses in Lesotho [101].…”

Section: Challenges and Advantages Of The Swat Model Applicationmentioning

confidence: 97%

A Review of SWAT Model Application in Africa

Akoko

Tú

Gomi

et al. 2021

Water

120

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The soil and water assessment tool (SWAT) is a well-known hydrological modeling tool that has been applied in various hydrologic and environmental simulations. A total of 206 studies over a 15-year period (2005–2019) were identified from various peer-reviewed scientific journals listed on the SWAT website database, which is supported by the Centre for Agricultural and Rural Development (CARD). These studies were categorized into five areas, namely applications considering: water resources and streamflow, erosion and sedimentation, land-use management and agricultural-related contexts, climate-change contexts, and model parameterization and dataset inputs. Water resources studies were applied to understand hydrological processes and responses in various river basins. Land-use and agriculture-related context studies mainly analyzed impacts and mitigation measures on the environment and provided insights into better environmental management. Erosion and sedimentation studies using the SWAT model were done to quantify sediment yield and evaluate soil conservation measures. Climate-change context studies mainly demonstrated streamflow sensitivity to weather changes. The model parameterization studies highlighted parameter selection in streamflow analysis, model improvements, and basin scale calibrations. Dataset inputs mainly compared simulations with rain-gauge and global rainfall data sources. The challenges and advantages of the SWAT model’s applications, which range from data availability and prediction uncertainties to the model’s capability in various applications, are highlighted. Discussions on considerations for future simulations such as data sharing, and potential for better future analysis are also highlighted. Increased efforts in local data availability and a multidimensional approach in future simulations are recommended.

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“…However, when PBIAS is positive, it shows an underestimation of the model and negative values indicate an overestimation model bias (Gupta et al, 1999). The choice of PBIAS is justified by the fact that it is widely used in the literature and allows a more precise evaluation of the efficiency of the model (Coffey et al, 2004;Santhi et al, 2001;Chu et al, 2004;Gassman et al, 2007;Moriasi et al, 2007;Schuol et al, 2008b;Sintondji et al, 2008;Rollo, 2012;Vilaysane et al, 2015;Aouissi et al, 2016;Havrylenko et al, 2016, Maliehe et al, 2017Molina-Navarro et al, 2017). The NSE coefficient (equation ( 2)) varies from −∞ (for a very weak adjustment) to 1 (for a strong link between the observed and simulated values).…”

Section: Mcmcmentioning

confidence: 99%

Implementation of the Semi-Distributed SWAT (Soil and Water Assessment Tool) Model Capacity in the Lobo Watershed at Nibéhibé (Center-West of Côte D’Ivoire)

Koua¹,

Dhanesh²,

Jeong³

et al. 2021

GEP

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The Lobo watershed is an agricultural area where the use of fertilizers by farmers is intensive, causing eutrophication problems that deteriorate the quality of drinking water distributed to the population. Since the phenomenon of eutrophication is directly linked to runoff, it is essential to model the flow in order to better control the transfer of nutrients responsible for eutrophication. It is within this framework that this study was conducted. The objective of this study is to assess the ability of the semi-distributed SWAT (Soil and Water Assessment Tool) model to simulate runoff in the Lobo watershed. The methodology adopted was based on the use of the QSWAT graphical interface to manipulate and execute the main functions of the SWAT model from QGIS tools. The hydrological modeling was carried out with the QSWAT interface for SWAT 2012. The results showed good performance for the flow calibration (1982)(1983)(1984) with the evaluation criteria R 2 , NSE and PBIAS respectively of 0.64, 0.64 and 3.1. In the validation period (1984)(1985)(1986)(1987), the model also showed good performance in the streamflow simulation for R 2 and NSE of 0.84 and 0.76 respectively as values. However, for the PBAIS criterion, the result was less good but still remains satisfactory with a value of 19.6. It emerges from this study that the SWAT model is suitable for simulating water transfer and can therefore be used to study the transfer of pollutants in the fight against eutrophication in the Lobo watershed.

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Assessment of water availability for competing uses using SWAT and WEAP in South Phuthiatsana catchment, Lesotho

Cited by 33 publications

References 17 publications

The Impacts of Water Demand and Its Implications for Future Surface Water Resource Management: The Case of Tanzania’s Wami Ruvu Basin (WRB)

The Impacts of Water Demand and Its Implications for Future Surface Water Resource Management: The Case of Tanzania’s Wami Ruvu Basin (WRB)

A Review of SWAT Model Application in Africa

Implementation of the Semi-Distributed SWAT (Soil and Water Assessment Tool) Model Capacity in the Lobo Watershed at Nibéhibé (Center-West of Côte D’Ivoire)

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Assessment of water availability for competing uses using SWAT and WEAP in South Phuthiatsana catchment, Lesotho

Cited by 33 publications

References 17 publications

The Impacts of Water Demand and Its Implications for Future Surface Water Resource Management: The Case of Tanzania’s Wami Ruvu Basin (WRB)

The Impacts of Water Demand and Its Implications for Future Surface Water Resource Management: The Case of Tanzania’s Wami Ruvu Basin (WRB)

A Review of SWAT Model Application in Africa

Implementation of the Semi-Distributed SWAT (Soil and Water Assessment Tool) Model Capacity in the Lobo Watershed at Nib&#233;hib&#233; (Center-West of C&#244;te D’Ivoire)

Contact Info

Product

Resources

About

Implementation of the Semi-Distributed SWAT (Soil and Water Assessment Tool) Model Capacity in the Lobo Watershed at Nibéhibé (Center-West of Côte D’Ivoire)