OPTIMAL CROP MIX FOR LAND APPLICATION OF MUNICIPAL WASTEWATER
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Least cost solutions for a three million gallon a day land
application of municipal wastewater system are estimated for
three levels of capital cost subsidy: no subsidy, 7 5 percent, and
85 percent. Irrigation of reed canarygrass is superior of alfalfa,
corn, forests, and natural vegetation (weeds). The cost of a full
year irrigation of reed canarygrass ranges from $493,000 to
$565,000 depending upon the assumed value of reed canarygrass.
If the local municipality minimizes its costs while receiving
subsidies, inefficiencies result. Total costs to society can increase
in excess of 65 percent of the minimum cost solution.