1. EFH-2 Engineering Handbook Chapter 2
Basic Input / Output for Connecticut
Introduce yourself.
EFH-2 Basic Input/Output

2. Lesson Objectives Upon completion of this lesson, you will be able to:
Start the EFH-2 program and navigate through the various windows
Develop input data for single sub-area watersheds
Input sub-area data into EFH-2
Run EFH-2
Interpret Output
The objectives for this lesson are for you to be able to:
Start EFH-2 and navigate through the various windows;
Develop input data for single sub-area watersheds and understand what minimum data requirements are needed to complete a run;
Input the data into the program;
Run the program; and
Interpret the output.
EFH-2 Basic Input/Output

3. Starting EFH-2 and Program Windows
We’ll begin by looking at starting the program, then take a look at the EFH-2 Main Window. Then we’ll look at various other data input windows, and discuss the data input parameters along with some items to watch out for when developing input data for and running EFH-2. Click along to start the program and navigate to the various windows as we discuss them.
(Note to Instructor: At this point, all students should have their computers ON and be starting the program and navigating to each of the various windows as they are discussed.)
EFH-2 Basic Input/Output

4. Starting the Program OR From Windows Explorer: Desktop Shortcut:
The standard method of starting the program is to click the Start button located at the bottom left hand of the computer monitor, then navigate to Programs, then to Engineering Applications, and finally to EFH2.
If you have a EFH-2 shortcut located on your desktop, it is necessary only to click on the EFH-2 icon to start the program. A desktop shortcut is NOT created as part of the EFH-2 installation. You will have to create your own desktop shortcut if you want one.
Start the program now if you haven’t already done so.
EFH-2 Basic Input/Output

5. Welcome to EFH-2
On first start up, the Welcome to EFH-2 Engineering Field Handbook, Chapter 2, Hydrology window opens. Here you will find:
 the Disclaimer, stating that you, as the user, hold ultimate responsibility for interpretation of any data generated through using this program;
Introduction window will show after 2-5 seconds.
EFH-2 Basic Input/Output

6. Help for Welcome to EFH-2
Clicking the Help Menu from the Introduction tab window, a opens the Help for Engineering Field Handbook for EFH-2.
EFH-2 Basic Input/Output

7. EFH-2 Main Window Menu Bar Buttons Bar Tabs Boxes
The EFH-2 Main Window looks pretty much like most computer programs written for the Windows operating system.
Features of this window are:
 the Menu Bar through which all options and features of the program are accessible;
 the Button Bar which allows you to open new windows or perform other activities without having to search through the menu bar for the appropriate options; and
 Introduction, Basic data, Rainfall/Discharge data & RCN tab where you enter data by typing it in.
Let’s take a bit more of an in-depth look at these features.
EFH-2 Basic Input/Output

8. File Menu New or button Open or button Recalculate Save or button
Print or button
Exit
The File menu looks like that of any windows operating system program. The menu choices here are
New (to clear out any data and start a complete new file),
 Open or the Open button (to open an existing file),
 Recalculate, Use this command to force a recalculation of the output data. While the program automatically recalculates with each change in a data file.
 Save (to save the input file),
 Print (to print the output printouts), and
 Exit (to exit the program).
EFH-2 Basic Input/Output

9. Edit Menu Cut or button Copy or button Paste or button
The Edit menu looks like that of any windows operating system program. The menu choices here are
Cut - Use this command to cut the selected (highlighted) data from an entry field.
 Copy – Use this command to copy the selected (highlighted) data from an entry field to the Window clipboard area.
 Paste – Use this command to insert the current data from the Windows clipboard area to the current cursor position in the field.
EFH-2 Basic Input/Output

10. View Menu
Toolbar
The View menu looks like that of any windows operating system program. The menu choices here are
Toolbar (to turn on or off the toolbar),
EFH-2 Basic Input/Output

11. Tools Menu Average Slope Calculator or button.
Hydrologic Soil Groups button.
The Tools menu looks like that of any windows operating system program. The menu choices here are
Average Slope Calculator - this command is available only when the “Basic Data” tab is activated. This window allows the user to determine the average watershed slope.
 Hydrologic Soil Group – this command is available only when the “RCN” tab is activated. This window allows the user to view the data in the SOILS.HG file to lookup the hydrologic group value (A, B, C and D) for various soil types.
EFH-2 Basic Input/Output

12. Help Menu Contents or button.
The Help menu looks like that of any windows operating system program. The menu choices here are
Help – Use this command to read this help. Abbreviated help is available for each entry field via Tool Tip pop-ups.
 About – Use this command to get information about the program version, contributing partners, and the program’s author.
EFH-2 Basic Input/Output

13. EFH-2 Main Window Buttons
New
Print
Paste
Open
Cut
Slope
Calculator
Help
Copy
Save
Hydrologic
Soil
Group

14. Introduction Tab
The “Introduction “ tab looks like that of any windows operating system program.
Peak discharge is determined by procedures contained in NRCS Engineering Field Handbook, Chapter 2. Information needed to use this procedure include watershed characteristics (drainage area, curve number, watershed length, watershed slope) and rainfall amount and distribution.
 The method applies with limitations – runoff curve number, watershed area, hydraulic length, watershed slope, no valley or reservoir routing, and urban land use does not exceed 19%
EFH-2 Basic Input/Output

15. Basic data Tab
The “Basic data” tab looks like that of any windows operating system program.
Basic data input – Client name, state, selected county, enter Practice, design by and date.
 Other input parameters – Drainage Area, Runoff Curve Number, Watershed Length, Watershed Slope, and Time of Concentration.
EFH-2 Basic Input/Output

16. Rainfall/Discharge data Tab
The “Rainfall/Discharge data” tab looks like that of any windows operating system program.
Rainfall Types– default to Type I, IA, II, III and DMV
 Frequency – 2, 5, 10, 25, 50, 100 years storm event.
 24-HR Rain (in) – the amount of precipitation in a 24 hour period for the corresponding frequency.
Peak Flow (cfs) – maximum discharge in cubic feet per second (cfs) for the runoff resulting from the defined storm.
Runoff (in) – the volume of the excess precipitation , in inches on the watershed, not absorbed by the soil nor held on the vegetation.
EFH-2 Basic Input/Output

17. RCN (Runoff Curve Number) Tab
The “RCN – Runoff Curve Number” tab looks like that of any windows operating system program.
Urban Area
Developing Urban
Cultivated Agriculture - cultivated agriculture lands such as fallow, row crops and small grain, etc.
Other Agriculture
Arid Rangland
 Acres or Percentage.
 Weighted Curve Number
Accumulated Area (ac)
EFH-2 Basic Input/Output

18. File Management within EFH-2
Input file “example.efm”
Rainfall file “COUNTY.CT”
Rainfall Distribution file “type.rf”
Type I, IA, II, III & DMV
For Northeast states, draft distributions, Type II and Type III are in the file “type.rf”
Soils file “SOILS.hg”
To substitute northeast rainfall database and rainfall distribution files for the standard files, copy these to C:\Program Files\USDA\EFH2 directory.
WinTR-20 - Overview

19. EFH-2 Printed Output

20. EFH-2: Input File

21. Draft Rain Dist Regions

22. Zoom to Connecticut

23. EFH-2: Rainfall Data
County.CT
EFH-2 Basic Input/Output

24. Standard Rainfall Distribution Types, CCE version
Type I
Type IA
Type II
Type III
Type DMV
The numbers in this table relate Tc with unit peak discharge for Ia/P values in the left column of the table (such as 0.1 to 0.5). They are derived from running WinTR-20 with a set of rainfalls and time of concentrations.
EFH-2 Basic Input/Output

25. Draft Rainfall Distribution types for northeast
type.rf
NE_A
NE_B
NE_C
Type II
Type III
EFH-2 Basic Input/Output

26. http:/directives.sc.egov.usda.gov/viewDirective.aspx?hid=2517
EFH-2 User’s Manual
EFH-2 Basic Input/Output

27. Entering Data, Running the Program and Interpreting Output
Demo #1
Single Sub-area Watershed with Minimum Data Requirements
We’ll now work through a Demonstration Problem.
EFH-2 Basic Input/Output

28. Demo #1
A large lot subdivision is planned in the watershed drainage area shown on the upcoming topo map and aerial photo.
There are no county level stormwater detention ordinances, but the county is interested in knowing how much increased runoff would occur because of the development.
For this Demonstration Problem, a large lot subdivision is planned in the watershed drainage area shown on the upcoming topographic map and aerial photograph.
There are currently no county level stormwater detention ordinances, but the county is interested in evaluating how much increased runoff would occur because of the proposed development.
EFH-2 Basic Input/Output

29. Demo #1
The developer has been considering this project for a number of years and, using EFH-2, previously determined the runoff curve number and time of concentration as shown on the following slide.
Determine the runoff volume and peak discharge for the current (existing) watershed conditions.
This development has been planned for a number of years and the developer previously utilized manual EFH-2 to estimate a runoff curve number and time of concentration for the current conditions. That data is shown on the following slides.
The first step in making this analysis is to determine the runoff volume and peak discharges for the existing watershed conditions.
(Later we’ll look at revising those values for the proposed development, but for now, we want to determine the current condition.)
EFH-2 Basic Input/Output

30. Demo #1 Drainage Area 24.5 acres Runoff Curve Number 74
Watershed Length
3500 feet
Watershed Slope
21.5 %
Adams County, Nebraska
This topographic map shows the delineated watershed boundary. The blue line shows the stream channel running from the watershed outlet to a county road downstream. We’ll take a further look at what’s happening at that county road when we get into modeling multiple sub-areas later in the training.
EFH-2 Basic Input/Output

31. Demo #1 Drainage Area 24.5 acres Runoff Curve Number 74
Watershed Length
3500 feet
Watershed Slope
21.5 %
Adams County, Nebraska
This is the same watershed area shown on an aerial photograph.
The drainage area for this watershed is 24.5 acres.
The runoff curve number was computed to be 74; and the time of concentration computed to be hours.
The watershed is located in Williamson County, Illinois.
EFH-2 Basic Input/Output

32. EFH-2 Main Window
Since this is a single sub-area watershed and complete data are given for this problem (on the previous slide), you may enter this information directly onto the EFH-2 Introduction tab - Main Window.
EFH-2 Basic Input/Output

33. Basic data Window
EFH-2 Basic Input/Output

34. Basic data Window
EFH-2 Basic Input/Output

35. Basic data Window
Since this is a single sub-area watershed and complete data are given for this problem (on the previous slide), you may enter this information directly onto the EFH-2 Main Window.
Here is the Client, State, select County, Practice, and By.
EFH-2 Basic Input/Output

36. Basic data Window  The Drainage Area is expressed in acres.
Since this is a single sub-area watershed and complete data are given for this problem (on the previous slide), you may enter this information directly onto the EFH-2 Main Window.
 The Drainage Area is expressed in acres.
 Enter the Runoff Curve Number or use the “RCN” tab.
The Watershed Length is feet.
The Watershed Slope is in percent or use the “Slope Calculator”
The Time of Concentration in hours.
EFH-2 Basic Input/Output

37. Rainfall/Discharge Window
 Click on the “Rainfall/Discharge data” tab to select the rainfall distribution types and view the results.
EFH-2 Basic Input/Output

38. Rainfall/Discharge Window
Select “Rainfall – Type” from the dropdown.
View the results after selecting the Rainfall types (example: Type I, Type IA, Type II, Type III and DMV)
EFH-2 Basic Input/Output

39. Results
Find the peak discharge and runoff volumes for the 10-year and 100-year storm events.
Peak Discharge
Runoff Volume
10-year
38 cfs
1.71 in
25-year
50 cfs
2.21 in
50-year
66 cfs
2.85 in
100-year
76 cfs
3.27 in
Take a few moments now to determine the runoff volumes for the 10-year and the 100-year storm events.
(Give the students a few moments to scroll through the data and find the output.)
 The results you should have gotten are shown here. Did anyone get anything different?
EFH-2 Basic Input/Output

40. Save an EFH-2 Data File Click the button
(or File-Save from the main window menu bar)
Specify location
Specify file name
Click Save button
Let’s save the file before moving on.
 To save a file, click the Save Button (or File-Save menu item) to open the Save a EFH-2 data file window.
 Use the drop-down menu to select in which directory you wish to save the file.
 Enter an appropriate filename.
 And click the Save button to save the file and return to the main window.
EFH-2 Basic Input/Output

41. Print Output The objectives for this lesson are for you to be able to:
Start EFH-2 and navigate through the various windows;
Develop input data for single sub-area watersheds and understand what minimum data requirements are needed to complete a run;
Input the data into the program;
Run the program; and
Interpret the output.
EFH-2 Basic Input/Output

42. Summary
Start the EFH-2 program and navigate through the various windows
Input sub-area data into EFH-2
Run EFH-2
Interpret Output
The objectives for this lesson are for you to be able to:
Start EFH-2 and navigate through the various windows;
Develop input data for single sub-area watersheds and understand what minimum data requirements are needed to complete a run;
Input the data into the program;
Run the program; and
Interpret the output.
EFH-2 Basic Input/Output

43. Questions ?
Summary