FEQ Full Equations Model

FEQ is a computer model for simulation of one-dimensional unsteady flow in open channels and through control structures. The structure of the program is designed to follow the structure of a stream system and provide maximum generality and flexibility. FEQ can be applied to simulate a wide range of stream configurations including loops and lateral-inflow conditions. Special features such as culverts, weirs, and sluice gates are included in coordination with the Full Equations Utilities package (FEQUTL). Boundary conditions can be water-surface elevation, discharge, or the stage-discharge relation at a node. Wind-stress, rainfall, evaporation, and irrigation terms are supported. The effects of lateral inflows also can be simulated in FEQ when given local runoff intensity data.

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FEQ Model Documentation Online Version	Full Equations (FEQ) Model For One-Dimensional Unsteady Flow in Open Channels -- USGS Water-Resources Investigations Report 96-4240 (HTML); (PDF) Full Equations Utilities (FEQUTL) Model for the Approximation of Hydraulic Characteristics of Channel Systems --USGS Water-Resources Investigations Report 97-4037 (HTML); (PDF) FEQ and FEQUTL comprehensive release notes (text) Check the most recent FEQ user notice
Search Engine Index Tool	Search the FEQ and FEQUTL documentation reports and web site for words or phrases:
Download the 2009 FEQ and FEQUTL	FEQ 10.61 and FEQUTL 5.80 Summary of version history Important user notices when upgrading previous model versions Summary of user notices and bugs for the 2009 version
Download the 2005 FEQ and FEQUTL	FEQ 9.98 and FEQUTL 5.46 Summary of version history Summary of user notices and bugs for the 2005 and earlier versions
Download the 1999 FEQ and FEQUTL	FEQ 8.92 and FEQUTL 4.68 Enhancements and modifications to the FEQ model to 1999 Enhancements and modifications to the FEQUTL model to 1999 Summary of user notices and bugs for the 1999 and earlier versions
Online Help	Review Guidance for FEQ model applications (non-USGS report prepared by Dewberry & Davis LLC for the Federal Emergency Management Agency) FEQ Simulation Flow Chart Diagnosing Computational Problems in FEQ FEQ Glossary
Resources and Training	FEQinput -- line editor for FEQ and FEQUTL input files FEQ-GDI -- viewer for geometric and hydraulic data in FEQ and FEQUTL input files Information on a previous FEQ course sponsored by IAFSM (November 18-21, 2008)
References	Selected publications related to FEQ DuPage County, Illinois web site with links to recent simulation results using HSPF and FEQ (link to a non-USGS external site) DuPage County, Illinois web site on watershed planning and modeling using HSPF and FEQ (link to a non-USGS external site)