Brian Hayes meets Stanley Crawford and gets to know the New Mexico acequia system.
The water in an irrigation ditch is a shared resource, like the unfenced common pastures that so famously became so tragic in early-modern England. In fact, the irrigation ditch is even more vulnerable to selfish exploitation than a pasture that’s equally available to all: Those on the upper reaches of the ditch have it within their power to divert all the flow into their own fields, depriving those below. Yet they choose not to do so. What explains their forbearance?