Rainfall and Water Tanks

Water Tanks
Our rainfall is an average of 300 mms (10 inches) a year, but it is very erratic, as shown by the chart below.
We rely on water pumped from the irrigation channel into our supply of tanks. The taller tank, on the stand, gives us water pressure for our shower.
Windmills were in use before electricity was connected to this area in 1951. They were easily damaged by severe winds, only worked in moderate breezes, and the clack (usually a leather seal in the lifting section) must be kept moist.
The windmill is, in 1998, no longer a working model, being replaced by an electric pump that cost about 10% of the windmill price, is easier to prime, and is also low maintenance.
In both cases, water needs to fill the inlet pipe before the mill or pump is started, so that the vacuum lift work of the pump can function. Water is lifted from the channel into the tanks.

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Rainfall per quarter and year, 1974 to 1998
January - March Orange, April - June Blue, July - September Green, October - December Yellow.
Each colour contains the total rainfall for that quarter.
.
197416119010175Total = 527 mm
19753330117224Total = 404 mm
1976643255136Total = 288 mm
197772582348Total = 202 mm
1978349712477Total = 332 mm
197977976069Total = 303 mm
1980101644257Total = 273 mm
1981688910645Total = 308 mm
19825431297Total = 122 mm
19833526114105Total = 279 mm
19841142113329Total = 297 mm
1985103858158Total = 264 mm
19861148134100Total = 293 mm
1987375910760Total = 263 mm
198839909181Total = 301 mm
1989791655758Total = 358 mm
1990251238710Total = 245 mm
19918810310727Total = 325 mm
19921370117295Total = 496 mm
1993952986177Total = 386 mm
199479323121Total = 162 mm
199566708680Total = 303 mm
1996615311428Total = 256 mm
199750299739Total = 216 mm
199847295432Total = 163 mm
ScaleScale - 100100100100Scale in units of 100 mm
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