Garden with Insight v1.0 Help: Soil patch next day functions: for lower soil layers, calculate nitrate lost in percolation and lateral flow

For all soil layers but the surface layer, the amount of nitrate lost in percolation and lateral flow is calculated by the process shown for the top soil layer, with the percolation or lateral flow from that layer as the volume of water flowing through. Nitrate "lost" from percolation is not really lost to the soil patch because it moves down into the next soil layer. Only nitrate lost from percolation out of the last soil layer is truly lost. However, nitrate lost from lateral flow flows laterally out of the patch and is gone. If this simulation had a better model of the interactions between soil patches, lateral flow and the nutrients it carries would not be lost to the system but would flow into another soil patch.

calculation of nitrate lost from the top soil layer, lateral flow and percolation
EPIC Nitrogen Loss Through Leaching, Surface Runoff, and Lateral Subsurface Flow
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