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• elevation between consecutive aerial surveys of the landfill. <br /> 5.3.5 LEACHATE GENERATION <br /> The LCRS calculations for the Forward Landfill development include calculations <br /> for LCRS lateral spacing based on infiltration modeling (HELP3), pipe capacity <br /> based on tributary flows, and LCRS pipe wall thickness based on deflection <br /> analysis (see Appendix D). The sections that follow present the background and <br /> results for the LCRS calculations. <br /> Leachate Generation Analyses <br /> Modeling of potential leachate generation within the entire planned vertical and <br /> horizontal landfill expansion was completed using the United States Army Corps <br /> of Engineers HELP3 (Hydrologic Evaluation of Landfill Performance, Version <br /> 3.06). This modeling simulated a refuse fill placed over the entire liner <br /> development system, including liner placed over existing wastes. Input and <br /> output files are included as Appendix D. The calculated rate of leachate <br /> • generation and accumulation were the primary parameters used in designing the <br /> LCRS. <br /> Model Description and Setup <br /> HELP is a quasi-two-dimensional model that simulates moisture flux into and out <br /> of landfills. It has become the standard method for evaluating the potential <br /> performance of landfill liner and cover systems. The model calculates water <br /> balances in daily increments, and can provide output for daily, monthly, and <br /> annual values for precipitation, run-off, evapotranspiration, percolation, and <br /> lateral drainage. The calculations integrated the following user selected <br /> variables: <br /> • <br /> Forward Landfill JTD 5-21 <br /> L:\AII ied\2000.193\Reports\jtd:Sec-5.0:05/24/02 <br /> BRYAN A.STIRRAT A ASSOCIATES <br />