The political-economy of water (and other diversions)
as more than a quarter of all the water used indoors inthe U.S. goes down the toilet -- about six billion gallons daily --conservationwise, flushing is serious business.
Sewage systems are powered by water. If there is not enough water flowing into the system to keep things moving they get - quite literally - constipated. "Saving" water has cost a lot of money for what is a dubious saving in most parts of the country.
Fred,Good point, but there can be (and probably is) excess water in the system. I remember an interesting comment from water managers: They said that their reduction in water use from conservation was saving the sewage disposal people money (less volume), so perhaps the system has enough slack.
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