therisingblues wrote:Hey Roxy, just a question about your figures for water usage in the murray basin. If SA and Qld both use only 7% of the water, does this mean that both states use more or less the same amount of water from that source, or does the use of levees to collect water before it enters the system not included in that 7 %? Also if Qld uses just 7 %, but only 10 % of water that originates in Qld reaches SA, wouldn't that mean only .7 % of the total amount of water taken from the basin overall is lost to the Murray mouth because of Qld's water practices?
I hope you understand what I'm trying to say/ask, because I'm just trying to wrap my head around the info you've given us, and I'm wondering if perhaps we are being too hard on Qld.
The 7% of water used is 7% of the total amount available (on average) from the entire Murray Darling Basin, regardless of the state it originates in. This would equate to somewhere in the order of 30 to 40% of the water that originates in Queensland. Sorry I dont have the exact figures on this
The 7% is from licenced water extractions, few of which are floodplain diversions and most of which are pumped directly from river channels There are however quite a few floodplain diversions (levees) and instances of people pumping water from the river channels that do not have a licence to take water and so are not factored into the 7%. These are called illegal or unregulated diversions or extractions. It is impossible to know the volumes involved as they are not regulated or monitored as licenced extractions are. They are however thought to be numerous in QLD and NSW.
To confuse the issue a little more, there are sleeper licences. These are where people have a licence to extract water but don't use it or dont use all of what they are entitled to. They let the water flow on past their properties and down the river system. There are also water speculators who's primary interest is to lease the water to downstream users in order to make money. They often own no property upon which to irrigate, only a water extraction licence for the purpose of making money. A prominent bank is a key player in this game amongst other key investment businesses.
Im not sure about the question of the 0.7% being 'lost' to the Murray Mouth. As I stated in a previous post it is not 'lost' as it creates an estuarine environment to which marine food chains and breeding grounds depend. As for the number of 0.7% being absolute, I doubt it as there are irrigation extractions in SA (7% of the total water available in the MDB). The water management system in the Basin tends to work on the Northern Basin (Darling River System) and the Southern Basin (Murray River System) due to the minimal volumes that make it down the Darling and into the Murray, unless of course there is a flood then sh1t loads of water comes down the Darling and enters the Murray after Lake Victoria has been filled.
I hope this has gone some way to answering your question
