Hydraulic modelling of gross pollutant traps for North Queensland conditions

Quinn, Wade, Jegatheesan, Veeriah, Millard, Lindsay, Wheeler, Lauren, and Kauppila, David (2005) Hydraulic modelling of gross pollutant traps for North Queensland conditions. In: Papers from the Ozwater Specialist Conference, pp. 1-8. From: Ozwater Specialist Conference, 5 - 7 May, 2005, Townsville, QLD, Australia.

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Abstract

Stormwater management practices have been in place for many years to curb the impact that gross pollutants have on our natural waterways. However the efficiency and effectiveness of designs vary according to the location and climatic conditions of the concerned area. This research study has incorporated the design and modelling of trash rack systems, which are configured for use in tropical conditions found in northern Australia.

Previous studies have been conducted in southern states of Australia. However, these designs have been modelled under their subtropical climatic conditions at their test facilities. The conditions in tropical areas of Australia requires a design that can cope with rainfall events of a much higher intensity, with larger volumes of stormwater runoff. Due to the dry season, pollutant loadings accumulate between storm events and coupled with tropical rainfall, lead to difficulties for design solutions. In this study, three types of gross pollutant traps are considered for the following conditions: (1) Flows of 1 ARI, 2 ARI, 5 ARI, and 20 ARI, with (2) Pollutant loadings of 3 and 6 months. Evaluation of each gross pollutant trap design involves testing different flow rates with different pollutant loadings to determine the design's potential. The following observations have been used as criteria in which to judge the effectiveness and efficiency of each design (Beecham and Sablatnig, 1994): (1) Motion of the water through the system. (2) Motion of the litter placed in the channel and the interaction with the trap. 3) Position of the litter on the trap, during the testing, and its final location once all flow has ceased. (4) Backwater effects due to the obstruction caused by the gross pollutant trap and litter. (5) Self-cleaning abilities of the gross pollutant trap. (6) Effects of raising and lowering the tail water level. (7) Effects different loadings with different flows have on the trap.

The desired outcome of the research is to produce a design, which has low maintenance and is also cost effective. The self-cleaning abilities of each design are the key to achieving these criteria.

Item ID: 7685
Item Type: Conference Item (Refereed Research Paper - E1)
Keywords: average recurrence interval; gross pollutant traps; hydraulic modelling; pollutant loading; storm runoff; tropical weather
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ISBN: 978-0-908255-63-4
Date Deposited: 20 Jul 2010 22:57
FoR Codes: 09 ENGINEERING > 0907 Environmental Engineering > 090702 Environmental Engineering Modelling @ 100%
SEO Codes: 96 ENVIRONMENT > 9609 Land and Water Management > 960999 Land and Water Management of Environments not elsewhere classified @ 100%
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