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EXH 327: VS2D Computer Program Input Data Formats Table 3 Cards B-14–C-3

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Sea-Tac Airport
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This document describes input data formats for the VS2D computer program, developed by the U.S. Geological Survey, which simulates fluid flow in variably saturated porous media. It details technical parameters for evaporation and evapotranspiration modeling, including variables for potential evaporation rates, rooting depth, root activity, and atmospheric pressure. The document also outlines time-step control settings used to manage the numerical simulation of subsurface water movement.

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Exhibit 327 (AR 020798–020800) from the PCHB Third Runway EIS proceeding. Pages from U.S. Geological Survey Water-Resources Investigations Report 83-4099 by Lappala, Healy, and Weeks documenting computer program VS2D for solving equations of fluid flow in variably saturated porous media. Contains Table 3 input data formats covering cards B-14 through C-3, including variables ETSIM, NPV, ETCYC, PEVAL, PTVAL, RDC arrays (RDC(1,J) through RDC(6,J)), TPER, DELT, TMLT, DLTMX, DLTMIN, TRED, DSMAX, STERR. Describes evapotranspiration simulation parameters including potential evaporation rate (PEV), surface resistance to evaporation (SRES), atmospheric pressure potential (HA), potential evapotranspiration rate (PET), rooting depth (RTDPTH), root activity (RTBOT, RTTOP), and pressure head in roots (HROOT). Filed as Exhibit 327 in Pollution Control Hearings Board third runway EIS proceedings.

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