How to make a model of a erosion free farm field??

    For all you science and geography hands on teachers out
    there....I am wanting to create a three dimensional model
    of a farmers field with a 15 degree slope to illustrate
    erosion-free farming. The model must have a way of testing
    this experiment to show that no soil is entering the
    stream at the bottom of the slope...I guess it'll have to
    be water proof...any ideas you can share as to how you
    would create this masterpiece. This is the first time I'm
    teaching this curriculum and am not very creative..I'm
    Thanks in advance for your help!!!

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