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CRC PUBLICATIONS |
Urban Stormwater Treatment by Storage: A Statistical Overview
Hugh Duncan
Publication Type:
Technical Report
This is a publication of the initial CRC for Catchment Hydrology
CRC Program:
Urban Hydrology (Previous CRC)
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Publication Keywords:
Storm Sewage
Water Treatment
Storage
Detention Reservoirs
Water Quality Assessment
Statistical Analysis
Wetlands
Ponds
Physiochemical Properties
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Abstract / Summary:
This report presents a statistical overview of urban stormwater treatment by detention in on-stream storage. The study was carried out by comparing and analysing the results of investigations at up to 51 separate locations in four countries reported in the literature.
Asll water quality concentration data analysed appears to be log-normally distributed. Area ratio is the best measure of basin size tested for predicting water quality change in storage. For some water quality parameters, input concentration is a highly significant explanatory variable, regardless of whether output concentration or percentage change is required. Area ratio and input concentration together can explain up to 89% of the between-study variation in output quality.
The 11 water quality parameters tested fall into three groups, based on their behaviour in storage - a settling group, a proportional group, and a rate-limited group. For the settling group, output concentration is roughly proportional to the square root of the input concentration, and inversely proportional to the square root of the area ratio. For the proportional group, output concentration is proportional to input concentration, and decreases very slowly as area ratio increases. For the rate-limited group, output concentration is proportional to input concentration to the power 1.6, and decreases slowly as the area ratio increases.
The derived relationships indicate that two smaller basins in series are more effective than one larger basin with the same total area ratio for all water quality parameters tested. Wetlands are either less effective than ponds of the same area ratio, or not significantly different from ponds, depending on the water quality parameter under consideration.
Average storage performance curves are presented for selected water quality parameters.
This report is not currently available for downloading. Printed copies are available from the Centre Office.
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Centre Office:
CRC for Catchment Hydrology
Dept of Civil Engineering
Building 60
Monash University Vic 3800
Tel: +61 3 9905 2704
Fax: +61 3 9905 5033
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