Water tanks and wildlife (Victoria)

To: "Paul Burcher" <>
Subject: Water tanks and wildlife (Victoria)
From: "Dave Torr" <>
Date: Mon, 25 Aug 2008 14:50:09 +1000
Depends where you are - as block sizes become smaller and people build
houses that cover almost every square metre of the block (outer west of
Melbourne and I suspect many other developing areas as well) the housing is
starting to cover an increasing %age of the land. Of course in this case
when they have no gardens you wonder why they want a rainwater tank unless
it is used for flushing toilets!

2008/8/25 Paul Burcher <>

> Dave et al
> The amount of rainfall "interrupted"" by water tanks in relation to the
> area covered by other hard surfaces (especially roads) that concentrate
> flows to local creeks would be bugger all.  At least some of the tank water
> is being returned to the catchment in a moderating way through groundwater
> if used in gardens.  Also very few tanks are large enough to capture all the
> water that falls on a roof so a lot ends up as stormwater anyway.
> I suspect the decline in the lagoon in Brisbane had nothing to do with
> tanks but was just a lag effect from evaporation or lack of groundwater
> flow.
> Paul

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