HEC-HMS Technical Reference Manual
HEC-HMS Technical Reference Manual
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HEC-HMS Technical Reference Manual
Welcome to HEC-HMS.
Topics
Introduction
Contents of this Manual
Program Overview
Other Program References
Organization of this Manual
References
Primer on Models
What is a Model?
Model Classification
Constituents of a Model
Models and Computer Programs
References0
Program Components
Watershed Processes
Representation of Watershed Processes
Synopsis of Program Methods
Program Setup and Application
References1
Geographic Information System (GIS)
GIS Basic Concepts
Basin Characteristics
GIS References
Meteorology
General
Precipitation
Temperature
Shortwave Radiation
Longwave Radiation
Pressure
Dew Point and Humidity
Snow Accumulation and Melt
Snowmelt Basic Concepts
Snow Properties
Snowpack Mass and Energy Accounting
Available Snow Accumulation and Melt Methods
Temperature Index Method
Hybrid Snow
Energy Budget Method
Applicability and Limitations of Snow Accumulation and Melt Methods
Snowmelt References
Evaporation and Transpiration
Evaporation and Transpiration Basic Concepts
Available Evaporation and Transpiration Methods
Monthly Average Method
Hamon Method
Hargreaves Method
Priestley Taylor Method
Penman Monteith Method
Applicability and Limitations of Evapotranspiration Models
Evaporation and Transpiration References
Canopy, Surface, Infiltration, and Runoff Volume
Losses and Runoff Volume Basic Concepts
Infiltration
Canopy Interception
Surface Storage
Losses and Runoff Volume References
Transform
Unit Hydrograph Basic Concepts
Available Transform Methods
User-Specified Unit Hydrograph
User-Specified S-Graph
Clark Unit Hydrograph Model
ModClark Model
Snyder Unit Hydrograph Model
SCS Unit Hydrograph Model
Kinematic Wave Transform Model
2D Diffusion Wave Model
Applicability and Limitations of Transform Models
Transform References
Baseflow
Available Baseflow Methods
Constant Monthly Model
Recession Model
Bounded Recession Model
Linear Reservoir Model
Nonlinear Boussinesq Model
Applicability and Limitations of Baseflow Models
Baseflow References
Channel Flow
Channel Flow Basic Concepts, Equations, and Solution Techniques
Available Channel Routing Methods
Kinematic Wave Channel Routing Model
Lag Model
Lag and K Model
Modified Puls Model
Muskingum Model
Muskingum-Cunge Model
Normal Depth Model
Straddle Stagger Model
Applicability and Limitations of Channel Routing Models
Channel Flow References
Erosion and Sediment Transport (Under Construction)
Erosion Methods
Sediment Transport Methods
Reservoir Sediment Methods
Fall Velocity and Settling
Erosion and Sediment Transport References
Water-Control Facilities
Diversion Modeling
Reservoir and Detention Modeling
References9
Modeling Reservoirs
Basic Concepts and Equations
Routing and Storage Methods
Outflow Curve Routing Method
Specified Release Routing Method
Outflow Structures Routing Method
Outflow Structures
Outlets
Spillways
Dam Tops
Pumps
Dam Break
Dam Seepage
Additional Release
Evaporation
References91
Calibration
What is Calibration?
Summary of the Calibration Procedure
Goodness-of-Fit Indices
Search Methods
Constraints on the Search
Calibration References
Optimization
Ensemble Modeling
CN Tables
Glossary
Uncertainty
Basic Concepts
Available Uncertainty Analysis Methods
Simple Distribution
Monthly Distribution
Regression with Additive Error
Specified Values
Uncertainty Chapter References