Dye tracing of the Lusaka karstified aquifer system: implications towards urban groundwater quality protection.
Dye tracing
Groundwater protection
Karst aquifer
Lusaka
Management
Sanitation
Journal
Environmental monitoring and assessment
ISSN: 1573-2959
Titre abrégé: Environ Monit Assess
Pays: Netherlands
ID NLM: 8508350
Informations de publication
Date de publication:
25 May 2023
25 May 2023
Historique:
received:
27
10
2022
accepted:
19
04
2023
medline:
29
5
2023
pubmed:
26
5
2023
entrez:
25
5
2023
Statut:
epublish
Résumé
Management of groundwater resources requires a large amount of data, coupled with an understanding of the aquifer system behavior. In developing countries, the scarcity in groundwater data has led to aquifers being managed according to rule-of-thumb standards or even abandoned as unmanageable at times. Groundwater quality protection thus has been through prescribed separation distances often without due regard for internal and boundary characteristics that affect response rates of groundwater movement, attenuation of pollutants, and recharge. In this study, we examine the boundary characteristics of the highly vulnerable karst aquifer system in the rapidly expanding city of Lusaka using a dye tracer technique. We investigate the flow dynamics (magnitude and direction) of groundwater using dye tracer dyes (fluorescein and rhodamine) spiked in pit latrines and observed at discharge springs. The results provide irrefutable evidence that pit latrines are a source and a pathway to contamination of groundwater. Dye tracer movement in groundwater was rapid, estimated at 340 and 430 m/day for fluorescein and rhodamine, respectively, through interconnected conduit density. The vadose zone (epikarst) tends to store diffuse recharge before release to the phreatic zone. These rapid groundwater movements render regulatory separation minimum distances of 30 m between abstraction wells and pit latrines/septic tanks in such environments to be an ineffective means of reducing contamination. The policy focus in the protection of groundwater quality should henceforth be on robust sanitation solutions especially for low-income communities that recognize the socio-economic diversity.
Identifiants
pubmed: 37231317
doi: 10.1007/s10661-023-11272-z
pii: 10.1007/s10661-023-11272-z
doi:
Substances chimiques
Coloring Agents
0
Fluorescein
TPY09G7XIR
Rhodamines
0
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
732Informations de copyright
© 2023. The Author(s), under exclusive licence to Springer Nature Switzerland AG.
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