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Implementing environmental waterrequirements in Buzi River basin,Mozambique: An impact analysis based on the Water ResourceYield Model
2010 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

In areas where clean water is a scarce resource, balanced water consumption is necessary.

This can be achieved by assigning each water consumer a proportionate share of water, in

relation to what is available the system. Balanced water consumption should also include

reserving water for the ecosystems, with the intention to maintain a good ecological status in

the area. This latter reservation, essential for the river and its ecosystems, is called

Environmental water requirements

or Environmental flows.

The objective of this thesis was to study the water consumers and the impact of implementing

environmental water requirements in a specific river basin. The area that has been studied is

the Buzi River basin, in Mozambique. A field study was carried out in the area, in order to

collect water consumption and technical data for the study.

The analysis of this thesis is based on the South African "Water Resource Yield Model"

(WRYM), developed for system analysis of water resources. The model is based on a water

penalty system, where each consumer is assigned a priority in order to balance the water

consumption within the limits of availability.

The results show that the introduction of environmental water requirements would reduce the

amounts of available water for consumptive use by approximately 30% in order to maintain

the present ecological status of the area. Furthermore, the study demonstrates a significant

trade off between the level of generated hydropower and the amount available water for

consumptive use in the system. However, it can

not be concluded from the results that

environmental water requirements would reduce the production of hydropower in the Buzi

River basin. Finally, the study shows that decisions made on introduction of environmental

water requirements downstream the river, affect also the potential water consumers upstream,

because of the interlinked system.

As the Buzi River basin is a moderately modified area, with few water using activities, the

impact of environmental water requirements on water consumers is assumed to be relatively

low. However, if taking future development into account, potential water consumers are likely

to be affected, why studies such as this should be re-performed as the area develops.

It should be noted that the scenarios developed by the yield model hold uncertainties. The

results should therefore be used as a basis for discussion, rather than an assessment of the

area. Finally, the results from this project will be analyzed in an economic perspective, which

will provide valuable directives to the local water authority for discussions on water

allocation.

Place, publisher, year, edition, pages
2010.
Series
UPTEC W, ISSN 1401-5765 ; 11 008
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-350598OAI: oai:DiVA.org:uu-350598DiVA, id: diva2:1205510
Educational program
Master Programme in Environmental and Water Engineering
Supervisors
Examiners
Available from: 2018-05-14 Created: 2018-05-14 Last updated: 2018-05-14Bibliographically approved

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