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University of Botswana (2016)

Simulation and evaluation of water supply reservoirs using HEC-ressim model and RRV indices in the Notwane catchment

Keaitse, Edmore Otsile

Titre : Simulation and evaluation of water supply reservoirs using HEC-ressim model and RRV indices in the Notwane catchment

Auteur : Keaitse, Edmore Otsile

Université de soutenance : University of Botswana

Grade Master of Science (MS) in Hydrogeology 2016

Résumé partiel
Botswana has gradually developed its water resources at great expense but it is estimated that as much as half of it is wasted through leakage, lack of water demand management, knowledge gap, inefficient management and operation practices and policies. Reservoirs are one of the most valuable tools for integrated water resource development and management. However, their operation and management are still a challenge for integrated water resource development and management. With the increasing population and rapid development of the economies, the function and operation of reservoirs has become more and more important to help meet society’s energy and water requirements. Models are usually developed and used in order to facilitate decision-making. Simulation models strive to fill the knowledge gap, cross check analyses, support and address water resource development and management decisions. HEC-ResSim Model is one such model used to simulate the water resource system in the Notwane River Basin. It is a public domain model that enables easy sharing of knowledge and data among researchers. The base line scenario is configured in such a way to represent the current infrastructure and known management practices and calibrated with historical hydrological regime. The model is calibrated and its performance is checked using Nash-Sutcliffe efficiency and Coefficient of Determination, (R2), at key stations. The model calibration is satisfactorily accepted as the values for R2 and for NS coefficient for the fit of the daily water levels for the calibration period are 0.81 and 0.60 respectively and 0.62 and 0.27 and 0.54 and 0.39 respectively for the Bokaa, Gaborone and Nnywane dams in that order. Different scenarios including climate change, population growth, sedimentation and operation schemes for each dam have been simulated for the period of 2015 to 2050.

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