Hec-1 manual

It is a single storm event, lumped parameter model, but includes several different options for modeling rainfall, losses, unit hydrographs, and stream routing. The HEC-1 model is designed to simulate the surface runoff response of a river basin to precipitation by representing the basin as an interconnected system of hydrologic and hydraulic components. Each component models an aspect of the precipitation-runoff process within a portion of the basin, commonly referred to as a subbasin.

A component may represent a surface runoff entity, a stream channel, or a reservoir. Representation of a component requires a set of parameters which specify the particular characteristics of the component and mathematical relations which describe the physical processes. The model is designed to simulate long-term trends of scour and deposition in a stream channel that might result from modifying the frequency and duration of the water discharge and stage, or modifying the channel geometry.

This system can be used to evaluate deposition in reservoirs, design channel contractions required to maintain navigation depths, predict the influence of dredging on the rate of deposition, estimate maximum possible scour during large flood events, and evaluate sedimentation in fixed channels. Water Quality Analysis. This component of the modeling system is intended to allow the user to perform riverine water quality analyses.

Future versions of the software will include the ability to perform the transport of several additional water quality constituents. The HEC-RAS package includes several documents, each are designed to help the modeler learn to use a particular aspect of the modeling system.

The documentation has been divided into the following three categories:. User's Manual. The manual provides an introduction and overview of the modeling system, installation instructions, how to get started, a simple example, entering and editing geometric data, detailed descriptions of each of the major modeling components, and how to view graphical and tabular output. Equations are presented along with the assumptions used in their derivation.

Discussions are provided on how to estimate model parameters, as well as guidelines on various modeling approaches. Each example consists of a problem statement, data requirements, and general outline of solution steps, displays of key input and output screens, and discussions of important modeling aspects. The manual is organized as follows:. Download page Introduction.

Current page. All pages. The active input spreadsheet is designed to assist the user by identifying HEC-1 variables and their meaning.

The user may control all aspects of the spreadsheet to ease the understanding of the card grouping, using colors, fonts, highlighting, etc.

An audit routine that alerts the user of simple errors such as blank lines, etc. An in-depth review of all the features is available by accessing the Operation Manual on-line.

Insert the Application CD in the appropriate drive 2. Run the Setup. EXE 4.