Soil moisture models
     --- Manual or automatic fitting?

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An important first step in hydrologic analysis is understanding the various components of runoff.
The main components of runoff are:

Surface runoff

Water which travels over the ground surface to a channel.

Interflow

Water which infiltrates the upper soil layer and moves laterally to the stream channel.

Baseflow

Water which percolates downward to the water table and may eventually intersect a stream channel.

Direct runoff

Consists of surface runoff and a portion of the interflow.