Saltwater corrodes firefighting equipment and may harm ecosystems, especially those like the chaparral shrublands around Los Angeles that aren’t normally exposed to seawater. Gardeners know that small amounts of salt – added, say, as fertilizer – does not harm plants, but excessive salts can stress and kill plants.
What the fuck is an acre-foot?
It’s 1 chain by 1 furlong by 1 foot
I thought you were taking the piss, but no, an acre really is one chain (66ft) by one furlong (660ft). TIL.
Most likely the amount of water that covers one acre to a depth of one foot.
I’m guessing it’s the volume of water that is the area of an acre times a foot deep.
Freedom units. Equal to 3.2 million big gulps ;)
The volume to cover one acre with one foot (ie: of water). Cubic volume measurements are for metric.
1 acre of area by 1 foot high volume of water
That is absurd.
If I remember correctly, it comes from measuring volume coming to/from large bodies of water where surface area (acres) and depth changes (feet) are easier to measure and there is little reason to do unnecessary conversion to other, more common, units of volume for industry-specific purposes, especially if others outside the industry rarely see or care about such values.
It’s also very common in agriculture, especially older areas that use flood irrigation, where A. Larger volumes are hard to use in any other unit, and B. you want to know water application rates per-acre on your crops, something that is very easy to find when you are applying acre feet of water over X acres.
Yes it’s a “stupid” unit but it has it’s place.
Ok, but what about cubic metres?
Because the equation needs three numbers, and because one of them is 1, it won’t give a clear picture of the volume.
An acre foot is 1233 cubic meters