Analog modeling of transient moisture flow in unsaturated soil

<p/>Hydraulic and electronic analog models are developed for the simulation of moisture flow and accumulation in unsaturated soil. The analog models are compared with numerical models and checked with field observations. Application of soil physical knowledge on a soil technological problem by means of steady state considerations, pseudo-steady calculation, numerical models and analog models are compared.<br/>Some examples of application of analog models on drainage requirements are given. From these it appeared that drain spacing is important to avoid water logging, but that drain depth is more important to obtain workable conditions.<p/>