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USE OF GROUNDWATER AGE INDICATORS IN RISK ASSESSMENT TO AID WATER SUPPLY OPERATIONAL PLANNING

USE OF GROUNDWATER AGE INDICATORS IN RISK ASSESSMENT TO AID WATER SUPPLY OPERATIONAL PLANNING ABSTRACT Groundwater residence‐time survey results on 21 public water supplies in the chalk aquifer in southern England are compared with a previous Cryptosporidium risk assessment which was carried out on the same supplies for regulatory‐compliance purposes in 1999. The results indicate that residence‐time indicators could provide useful corroborative evidence for rapid recharge hazard ‐ not only in those settings already identified by microbiological surveillance, but also in the more difficult‐to‐identify situation where potential rapid pathways have been identified but the bacteriological indicators are negative or ambiguous. However, groundwater‐mixing processes under pumping conditions are complex, especially in the chalk, and will always require interpretation informed by an understanding of the local hydrogeological and operational setting. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Water and Environment Journal Wiley

USE OF GROUNDWATER AGE INDICATORS IN RISK ASSESSMENT TO AID WATER SUPPLY OPERATIONAL PLANNING

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References (23)

Publisher
Wiley
Copyright
Copyright © 2005 Wiley Subscription Services, Inc., A Wiley Company
ISSN
1747-6585
eISSN
1747-6593
DOI
10.1111/j.1747-6593.2005.tb00547.x
Publisher site
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Abstract

ABSTRACT Groundwater residence‐time survey results on 21 public water supplies in the chalk aquifer in southern England are compared with a previous Cryptosporidium risk assessment which was carried out on the same supplies for regulatory‐compliance purposes in 1999. The results indicate that residence‐time indicators could provide useful corroborative evidence for rapid recharge hazard ‐ not only in those settings already identified by microbiological surveillance, but also in the more difficult‐to‐identify situation where potential rapid pathways have been identified but the bacteriological indicators are negative or ambiguous. However, groundwater‐mixing processes under pumping conditions are complex, especially in the chalk, and will always require interpretation informed by an understanding of the local hydrogeological and operational setting.

Journal

Water and Environment Journal – Wiley

Published: Mar 1, 2005

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