Organization of this Manual

Table 1 shows how this manual is organized. Chapters 4-8 and 10 present the equations of the various methods, define the terms of the equations that make up the underlying algorithm, and explain the solution techniques used in the program. In addition, parameters of the methods and techniques for estimating the parameter values are also described.
Because of the importance of model calibration, Chapter 9 describes the automated calibration feature of the program in detail. This can be used to estimate model parameters with measured precipitation and streamflow.
Table 1.Summary of contents of HEC-HMS Technical Reference Manual.

Chapter	Topic	Description of Contents
1	Introduction	Provides an overview of the program and the technical reference manual
2	Primer on models	Defines terms used throughout the manual and describes basic concepts and components or the program
3	Program components	Describes how hydrologic processes are represented and identifies the methods that are included in the program
4	Precipitation	Identifies each type of precipitation event that may be analyzed, describes the format of the data for each, and presents the precipitation processing algorithms
5	Snow accumulation and melt	Summarizes the processes at work in a snow pack and describes the methods included simulating snow melt
6	Evaporation and transpiration	Describes the processes of evaporation and transpiration and describes how they are modeled in the program
7	Infiltration and runoff volume	Summarizes the methods that are included for estimating runoff volume, given precipitation
8	Surface runoff	Summarizes the methods available for computing runoff hydrographs, given runoff volume
9	Baseflow	Describes the methods for considering sub-surface flow
10	Channel flow	Describes the alternative methods for open channel flow that are available and provides guidance for usage
11	Water-control facilities	Describes the diversion and reservoir elements
12	Automatic parameter estimation	Describes how parameters may be calibrated with historical precipitation and runoff data