International Rainwater Cistern Systems Conference
Khon Kaen, Thailand
- January, 1987
Section F: Water Quality
Water Quality Aspects of a Rain Water Cistern System in
Nova Scotia, Canada
Richard S. Scott
Professor and Head
Department of Civil Engineering,
Technical University of Nova Scotia,
P. 0. Box 1000, Halifax, N. S.
Canada B3J 2X4.
The physical, chemical and bacteriological water quality
characteristics of a newly installed rain water cistern system in Nova Scotia,
Canada, were monitored monthly for a two year period at points within the
system. Calcium concentrations, alkalinity and pH in precipitation were
increased by leaching from cistern walls. Seasonal growth patterns of
surrounding vegetation cover were reflected by variations in concentrations of
potassium and phosphorus. Sludge accumulations in the cistern represent
potential water quality problems. First flush concentrations of some chemical
and heavy metal constituents were elevated, but diversion of first flush runoff
is not considered necessary to maintain cistern water quality.
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