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July 2010 - Swinburne University of Technology

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JULY <strong>2010</strong> swinburne<br />

WEB TOOL TO GET US<br />

tanked up<br />

STORY BY Kellie Penfold<br />

DR MONZUR IMTEAZ is a glass-half-empty<br />

kind <strong>of</strong> chap. He’s not being unduly<br />

negative, he just sees wasted opportunity in<br />

not being able to fill to the top.<br />

In particular he recoils at the thought <strong>of</strong><br />

half-empty rainwater tanks, or worse, tanks<br />

that can’t hold any more water, just because<br />

there’s no simple tool to help people better<br />

match storage with catchment.<br />

Water is again becoming our most<br />

precious resource – as it used to be when<br />

Australians better understood the realities <strong>of</strong><br />

living on the world’s driest continent – and<br />

collecting urban water, in particular, is likely<br />

to become crucial for our fast-growing towns<br />

and cities.<br />

Dr Imteaz’s interest in the re-emerging<br />

popularity <strong>of</strong> rainwater tanks – which for<br />

a period were actually banned by some<br />

municipalities – stems from his research<br />

at <strong>Swinburne</strong> <strong>University</strong> <strong>of</strong> <strong>Technology</strong>’s<br />

Centre for Sustainable Infrastructure,<br />

where he specialises in the development <strong>of</strong><br />

stormwater as a resource.<br />

This under-used water source and the<br />

commercial, rather than scientific, approach<br />

to capturing it is driving Dr Imteaz to<br />

develop a number <strong>of</strong> simple tools, building<br />

on the STORMKIT system he has already<br />

developed, to analyse and design stormwater<br />

systems.<br />

“House tanks are a good example. People<br />

want to catch the stormwater collected on<br />

their own ro<strong>of</strong>s, but tanks are <strong>of</strong>ten installed<br />

with little or no planning as to whether they<br />

are the right size. There are plenty <strong>of</strong> tanks<br />

that will never fill and there are plenty that<br />

are too small to capture all the water which<br />

is available,” Dr Imteaz says.<br />

He says engineers and managers dealing<br />

generally with water and drainage matters<br />

either use tedious manual calculations<br />

or sophisticated, large, data-dependent<br />

programs to perform stormwater analysis<br />

and design. The advantages <strong>of</strong> a tool such as<br />

STORMKIT are its accuracy and simplicity.<br />

STORMKIT was presented and<br />

demonstrated at the 32nd Hydrology and<br />

Water Resources Symposium, held in<br />

Newcastle in November 2009, and is now<br />

available to water managers and other users.<br />

Dr Imteaz is now developing an internetbased<br />

tool to help householders establish<br />

PHOTO: PAUL JONES<br />

Across Australia householders are installing rainwater tanks … without any handy way to calculate<br />

the optimum tank size. <strong>Swinburne</strong> researcher, Dr Monzur Imteaz, has set out to rectify this.<br />

rainfall capture capacity which, with suitable<br />

funding to help develop the website, could<br />

also be available this year.<br />

Corporate and local government<br />

stakeholders regularly employ consultants<br />

to analyse the potential water catchment in<br />

urban projects, but Dr Imteaz feels that this<br />

information – <strong>of</strong>ten obtained at a high price<br />

– is subsequently used by just a few people,<br />

whereas a web-based tool would be available<br />

to everyone and could be used over and over<br />

again.<br />

Using information such as contributing<br />

catchment size, tank volume, geographic<br />

location, weather conditions and the water’s<br />

intended use, his proposed calculation tool<br />

will determine the volume <strong>of</strong> water likely to<br />

be captured each year according to different<br />

rainfall scenarios.<br />

He notes that historic rainfall figures are<br />

not much help any more. “If you look at<br />

Melbourne, it was 650 millimetres for 70 or<br />

80 years. Yet for the past 12 years it has been<br />

360 to 630mm. Therefore, water storages are<br />

subject to high rainfall, average rainfall and<br />

below-average rainfall.”<br />

Near his <strong>of</strong>fice on the university’s<br />

Hawthorn campus are two large rainwater<br />

tanks with which Dr Imteaz has put his<br />

theory into practice, establishing their<br />

effectiveness and payback period. Applying<br />

his calculations to the capture area, he was<br />

able to measure by how much one tank was<br />

too large to readily fill, and the extent to<br />

which the other was too small to capture all<br />

available rainfall.<br />

The point Dr Imteaz makes is that better<br />

analysis and design before constructing such<br />

facilities would significantly improve their<br />

effectiveness and cost-benefit.<br />

Initially, the proposed tool is for<br />

stormwater capturing analysis for impervious<br />

ro<strong>of</strong>s only. But it can be extended for<br />

pervious surfaces (such as golf courses and<br />

playing fields) by incorporating soil loss<br />

parameters.<br />

While the complete development <strong>of</strong><br />

the proposed tool depends on the success<br />

<strong>of</strong> getting funds from relevant authorities,<br />

Dr Imteaz is moving his focus to fog<br />

water – to see what value there would be in<br />

harvesting moisture created during foggy<br />

weather conditions. ••<br />

CONTACT. .<br />

<strong>Swinburne</strong> <strong>University</strong> <strong>of</strong> <strong>Technology</strong><br />

1300 275 788<br />

magazine@swinburne.edu.au<br />

www.swinburne.edu.au/magazine<br />

Key points<br />

<strong>Swinburne</strong>’s Dr Monzur<br />

Imteaz is developing simple<br />

tools to analyse and design<br />

stormwater systems.<br />

His proposed calculation<br />

tool will determine the<br />

volume <strong>of</strong> water likely to<br />

be captured each year<br />

according to different<br />

rainfall scenarios.<br />

SUSTAINABILITY<br />

3

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