NRCS National Geospatial Development Center

The NGDC is a collaboration between the NRCS and WVU.

Conservation Model

Background material


The infiltration/runoff model compares agricultural management systems by showing runoff and infiltration from undisturbed surface soil samples.


The runoff water from conventionally tilled soils tends to have more sediment in it than that of soils from no-till/conservation planted fields due to the lower organic matter content and fewer organic glues present in the soil.


During times of the year when macropores (large holes) in the soil are open, there is more infiltration into a less disturbed soil. Earthworms and other soil organisms continually aerate the soil by creating large and small holes for air and water to travel into and through the soil.