WATER SUPPLY IN THE INTERIOR OF NEW SOUTH WALES. 109 
rryin 
have to travel more than 3 miles back from water ; but if the 
country will only carry a sheep to 4 acres, then, with like conditions, 
5,5 il 
it will only water 5,500. Of course there will be more water 
available after deducting for evaporation, but even allowing for 
to support this opinion, but it is supported by the numerous in- 
stances which have come under my notice of comparatively shallow 
in it. From the moment water runs into a tank a process of silt- 
walk into the tank for water, this process will be comparatively 
rapid, and a good tank may be destroyed in a very few years, 
that there can be no doubt the water should in every case be 
ing dry country, the time for which a tank will last, or the rate 
per annum at which it is likely to silt up, would be an item of 
ock are watered, and the amount of care exercised, that to lay 
_ down any rule would only be to mislead. To clean out an old 
