A Groundwater Modelling Investigation of Greywater Disposal : South Tarawa, Kiribati
This report focused on a numerical modelling assessment of the possible effects of greywater reuse on the freshwater lenses in South Tarawa, Kiribati. Conceptual models and 2D cross-sectional numerical models of selected transects of Betio, Bairiki...
| Main Authors: | , , , , , |
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| Format: | Report |
| Language: | English |
| Published: |
World Bank, Washington, DC
2019
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| Subjects: | |
| Online Access: | http://documents.worldbank.org/curated/en/326841574137941944/A-Groundwater-Modelling-Investigation-of-Greywater-Disposal-South-Tarawa-Kiribati http://hdl.handle.net/10986/32766 |
| Summary: | This report focused on a numerical
modelling assessment of the possible effects of greywater
reuse on the freshwater lenses in South Tarawa, Kiribati.
Conceptual models and 2D cross-sectional numerical models of
selected transects of Betio, Bairiki and Bikenibeu Islands
were developed based on available field data. Simulations
then were used to assess greywater transport and its effects
on freshwater lenses in current situation and future
scenarios. The modelling results show that adding the
greywater discharge increases notably the freshwater
thickness compared to the baseline scenario where greywater
discharge is neglected. Eight scenarios were simulated to
test the influence of rainfall dynamics and groundwater
abstraction rates on the contribution of greywater disposal
on freshwater lens thickness. The report then provides
recommendations for future work to enhance the outcomes of
future modelling efforts and the feasibility of indirect
greywater reuse. |
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