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Excerpt from Field Records Relating to Subsoil Water
The rate of percolation through the Dakota sandstone can not, of course, be stated with any approach to accuracy, but it seems suffi cient to assume that it averages a yard or more a month. Still less can the 'rate of seepage through the cover be estimated accurately pending systematic observation, but manifestly it is less than the rate of evaporation (else exposed surfaces Would sweat or weep yet not very greatly less (else the wetness would not so rapidly and uniformly increase inward and downward); provision ally it may be estimated at an inch a month, and an inch a month is equivalent to 12inches a year, or enough to supplement the 15 inches of annual rainfall and supply the relatively abundant crops produced wherever the agricultural operations are conducted judiciously.
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