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Liliard says, On-the-farm water resources are affected not only by precipitation, but also by soil type and origin, land use, management, topography and a host of other factors. The understanding of these factors and their interrelationships is improving rapidly as the extent of resea rch on water resource problems is accelerated." The engineer says one of the most important of these factors is the geology of the area. This influences the soil types and the extent to which the surface drainage system is developed. Where conditions favor formation of frequent, rather well defined draws and drainage channels in an area, you can expect high runoff rates in the watershed. However, where natural geologic erosion has been rather uniform with few depressions and well defined waterways visible, it is pretty
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