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HEC-HMS: A Computer Model for Rainfall-Runoff Modeling - Introduction and Setup - Prof. Fa, Study notes of Hydrology

Tennessee Technological University (TTU)Hydrology
Prof. Faisal Hossain

An introduction to hec-hms, a computer model used for rainfall-runoff modeling. It outlines the objectives of the class, the steps to download and install the software, and a guide to the interface. Users will learn how to navigate the hec-hms window, understand the role of different components, and edit submodels for watershed processes such as infiltration.

Typology: Study notes

Pre 2010

Uploaded on 08/18/2009

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9/23/05
INTRODUCTION TO HEC-HMS:
A COMPUTER MODEL FOR RAINFALL-RUNOFF MODELING
Objectives of this class:
1) To demonstrate rainfall-runoff modeling in HEC-HMS and learn how the land
components of the hydrologic cycle are represented on a watershed scale.
2) To learn how to implement HEC-HMS for a simple rainfall-runoff modeling
exercise for a watershed.
Steps:
1) Go to the HEC-HMS website at:
http://www.hec.usace.army.mil/software/hec-hms/hechms-hechms.html
2) Click on “HEC-HMS” under the “Download” button on your left hand side. This
will take you to a page where you need to download the HEC-HMS version 2.22
3) Download hms222single.exe in your local PC. This is a self-extracting setup file
that will install HEC-HMS once you double click on it.
4) Install HEC-HMS in your specified folder (say HEC-HMS) and restart.
5) Now run your HEC-HMS. It will open a window as follows:
FIGURE 1
6) The HEC-HMS that you have installed already has the necessary hydrologic and
watershed data and parameter files to run a rainfall-runoff modeling scenario for a
1
pf3
pf4
pf5

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Download HEC-HMS: A Computer Model for Rainfall-Runoff Modeling - Introduction and Setup - Prof. Fa and more Study notes Hydrology in PDF only on Docsity!

INTRODUCTION TO HEC-HMS:

A COMPUTER MODEL FOR RAINFALL-RUNOFF MODELING

Objectives of this class:

  1. To demonstrate rainfall-runoff modeling in HEC-HMS and learn how the land components of the hydrologic cycle are represented on a watershed scale.
  2. To learn how to implement HEC-HMS for a simple rainfall-runoff modeling exercise for a watershed. Steps:
  3. Go to the HEC-HMS website at: http://www.hec.usace.army.mil/software/hec-hms/hechms-hechms.html
  4. Click on “HEC-HMS” under the “Download” button on your left hand side. This will take you to a page where you need to download the HEC-HMS version 2.
  5. Download hms222single.exe in your local PC. This is a self-extracting setup file that will install HEC-HMS once you double click on it.
  6. Install HEC-HMS in your specified folder (say HEC-HMS) and restart.
  7. Now run your HEC-HMS. It will open a window as follows: FIGURE 1
  8. The HEC-HMS that you have installed already has the necessary hydrologic and watershed data and parameter files to run a rainfall-runoff modeling scenario for a

watershed. The watershed is called “Little River” near Tifton, GA. This is a research watershed maintained by ARS (Agricultural Research Service) and USDA (US Dept. of Agriculture). For more details on the watershed you may refer to: http://sacs.cpes.peachnet.edu/sewrl/LittleRiver/littleriver.htm

  1. You will now see three different items in each column that define the rainfall- runoff modeling for HEC-HMS: a) Under Basin Model, you have ‘Tifton’ – this item contains all the necessary hydrologic data of the river basin (such as parameters for infiltration, surface runoff, area of watershed, soils type etc.). The name “Tifton’ is arbitrary as – for your own specific problem and watershed you can have your own name; b) Under “Meteorologic Model”, you have “Tifton Hyetograph” – this item contains all the necessary files for meteorologic input to the modeling process – mainly the rainfall file; c) Under ‘Control Specifications” you have the item that controls how you will simulate the rainfall runoff process, mainly your timestep and the total time period for simulation.
  2. Now click on “Tifton” under Basin Model. This opens a new window that graphically represents the watershed as a landscape unit for simulation of rainfall- runoff process. FIGURE 2
  3. Essentially, all the major watershed hydrologic processes are represented by the green box, even though you do see the actual watershed delineation with the river

any of these links to modify the parameters or input needed to model the processes.

  1. Make sure you are still on the “Loss Rate” page and notice carefully how the current model setup for Tifton is configured. The infiltration is being modeled by a method called SMA (Soil Moisture Accounting). But you can actually change it to say, Green and Ampt or the NRCS (in this case, SCS) curve number method. I want you to play with these links and connect what you see to what you have learned so far in class (focus mainly on Green and Ampt and SCS method for infiltration). We shall ignore ‘Base Flow Method” and “Transform” for the time being.
  2. Running the Model: First you need to click on “Control Specifications” “(Jan 1
  • Jun 30, 1970) to define your timestep and total period of simulation. The default configuration is Jan 1- Jun 30, at hourly timestep. Next, click on ‘Simulate” (on the window that is generated when you click on the Basin Model (see figure 2). Therein, click on ‘Run Configuration’. Select all the items you see – i) Basin Model ii) Met Model id and iii) Control id; Give the ‘Run’ any number you want. FIGURE 4 Now click on ‘Compute Run’ under ‘Simulate’. Your configured HEC HMS model should run to complete the rainfall runoff simulation from Jan 1 to Jun 30
  1. Viewing/analyzing Model output: Right click on the green box to view results for the watershed processes (e.g. infiltration pattern in time, baseflow in time etc.). You can also click on the basin outlet blue box (junction) to view results for the outflow hydrograph. Please play around a little bit to find out how you can actually save the output data in text format to do your required analyses.