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Main Title Hydrologic Evaluation of Landfill Performance (HELP) Model, Version 3.04A (for Microcomputers).
CORP Author Environmental Protection Agency, Washington, DC.
Publisher Dec 95
Year Published 1995
Stock Number PB96-501432
Additional Subjects Models-simulation ; Software ; Landfills ; Hydraulic performance ; Leakage ; Leachate ; Linings ; Membranes ; Covers ; Geotechnical engineering ; Design analysis ; Subsurface drainage ; Surface runoff ; Design criteria ; Performance evaluation ; Land pollution ; Water pollution ; Precipitation(Meteorology) ; Solar radiation ; Meteorological data ; Evapotranspiration ; Soil water ; Hydrologic models ; Diskettes ;
Library Call Number Additional Info Location Last
NTIS  PB96-501432 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 2 diskettes
Abstract In Version 3, the HELP model has been greatly enhanced beyond Version 2. The number of layers that can be modeled has been increased. The default soil/material texture list has been expanded to contain additional waste materials, geomembranes, geosynthetic drainage nets, and compacted soils. The model also permits the use of a user-built library of soil textures. Computations of leachate recirculation and groundwater drainage into the landfill have been added. Moreover, HELP Version 3 accounts for leakage through geomembranes due to manufacturing defects (pinholes) and installation defects (punctures, tears and seaming flaws) and by vapor disfusion through the liner based on the equations compiled by Giroud et al. (1989, 1992). The estimation of runoff from the surface of the landfill has been improved to account for large landfill surface slopes and slope lengths. The snowmelt model has been replaced with an energy-based model; the Priestly-Taylor potential evapotranspiration model has been replaced with a Penman method, incorporation wind and humidity effects as well as long wave radiation losses (heat loss at night). A frozen soil model has been added to improve infiltration and runoff predictions in cold regions. The unsaturated vertical drainage model has also been improved to aid in storage computations. Input and editing have been further simplified with interactive, full-screen, menu-driven input techniques. The HELP model requires daily climatologic data, soil characteristics, and design specifications to perform the analysis. Daily rainfall data may be input by the user, generated stochastically, or taken from the model's historical data base. The model contains parameters for generating synthetic precipitation for 139 U.S. cities. The historical data base contains five years of daily precipitation data for 102 U.S. cities. Daily temperature and solar radiation data are generated stochastically or may be input by the user. Necessary soil data include porosity, field capacity, wilting point, saturated hydraulic conductivity, and Soil Conservation Service (SCS) runoff curve number for antecedent types for use when measurements or site-specific estimates are not available. Design specifications include such things as the slope and maximum drainage layers, layer thicknesses, leachate recirculation procedure, surface cover characteristics, and information on any geomembranes.
Supplementary Notes System requirements: a hard disk drive with 6 MB of available storage, a 80386 or 804886 preferred. Supersedes PB85-100725 (magnetic tape).
Availability Notes The software is on two 3 1/2 inch DOS diskettes, 1.44M high density. Documentation included; may not be ordered separately.
NTIS Title Notes Model-Simulation.
Category Codes 68C; 68D; 50B
NTIS Prices CP D02
Primary Description 100/00
Document Type NT
Cataloging Source NTIS/MT
Control Number 622001430
Origin NTIS
Type CAT