REQUIRES:
<l:4,35>Agricultural Revolution<e>
Built adjacent to irrigated land, such as a River, Farm or Water
Time: 2
<l:6,61>PW<e> costs:
<l:5,4>Grassland<e> and <l:5,1>Plains<e>: 300
<l:5,5>Deserts<e>: 500 