Water tanks and wildlife (Victoria)

["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