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Numerical Modeling Workflow 405 10.10.1.7 Layer Types The Layer Type Settings window is used to set the LAYCON value and the LAYAVG variables required by the MODFLOW numeric engine. The LAYCON value is the layer-type index array recognized by MODFLOW. MODFLOW has four different Layer Types to choose for LAYCON values as described below: Type 0 - Confined: Transmissivity and storage coefficients of the layer are constant for the entire simulation. Type 1 - Unconfined: Transmissivity of the layer varies and is calculated from the saturated thickness and hydraulic conductivity. The storage coefficient is constant; valid only for Layer 1. Type 2 - Confined/Unconfined: Transmissivity of the layer is constant. The storage coefficient may alternate between confined and unconfined values. Type 3 - Confined/Unconfined: [Default setting] Transmissivity of the layer varies. It is © 2 0 1 3 by Schlum berg er W a ter Services.
