Hec Ras Geometric Data Editor
15
ENTERING GEOMETRIC DATA IN HECRAS SAROJ KARKI (MSc in Water Resources Engineering,IOE, Pulchowk Campus) [email protected] ENTERING THE GEOMETRIC DATA Click Enter/Edit the geometric data. A new window will be displayed. Click the River Reach.
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Transcript of Hec Ras Geometric Data Editor
ENTERING GEOMETRIC DATA IN HECRAS SAROJ KARKI (MSc in Water Resources Engineering,IOE, Pulchowk Campus)
ENTERING THE GEOMETRIC DATA
Click Enter/Edit the geometric data.
A new window will be displayed.
Click the River Reach.
ENTERING GEOMETRIC DATA IN HECRAS SAROJ KARKI (MSc in Water Resources Engineering,IOE, Pulchowk Campus)
A pen will be displayed on the window as shown below and just sketch the river schematically
After finishing drawing the river double click on the window.
ENTERING GEOMETRIC DATA IN HECRAS SAROJ KARKI (MSc in Water Resources Engineering,IOE, Pulchowk Campus)
After you double click, A new Dialog Box will appear prompting you to Give the River name and Reach name .Enter
the River and Reach name of your River.
A river and reach will be formed as shown below.
ENTERING GEOMETRIC DATA IN HECRAS SAROJ KARKI (MSc in Water Resources Engineering,IOE, Pulchowk Campus)
ENTERING THE CROSS SECTION DATA
Click Cross Section.
ENTERING GEOMETRIC DATA IN HECRAS SAROJ KARKI (MSc in Water Resources Engineering,IOE, Pulchowk Campus)
A new window will be displayed as shown below
Go to Options Menu in Cross section Data.
Add a new Cross Section.
ENTERING GEOMETRIC DATA IN HECRAS SAROJ KARKI (MSc in Water Resources Engineering,IOE, Pulchowk Campus)
A dialog Box will appear asking you to enter the river Station. (You need to enter a chain age, eg. 10 or
10.6, etc. for your cross section station starting from the most U/S cross section and decreasing
downstream).
Highlight (or select) cross section data entry table (cross sections coordinates) by left click and drag on the
station and elevation.
ENTERING GEOMETRIC DATA IN HECRAS SAROJ KARKI (MSc in Water Resources Engineering,IOE, Pulchowk Campus)
Copy the cross section data from excel sheet or other text file and paste ( Ctrl+V) it on the highlighted
portion.
After you paste the copied cross section data it will be displayed as shown below.
ENTERING GEOMETRIC DATA IN HECRAS SAROJ KARKI (MSc in Water Resources Engineering,IOE, Pulchowk Campus)
Click apply data tab to see you cross section.
Downstream reach lengths.
LOB: Distance from this cross section to the next cross section D/S in the left overbank.
Channel: Distance from the centre line of this cross section to the next cross section in the main
channel
ROB: Distance from this cross section to the next cross section D/S in the Right overbank.
ENTERING GEOMETRIC DATA IN HECRAS SAROJ KARKI (MSc in Water Resources Engineering,IOE, Pulchowk Campus)
Main Channel Bank Stations
Click.
A new window will be displayed as below.
Click .
A cursor ( ) as shown above will be displayed on the cross section graph.
Select the point where you desire to fix your main channel bank station.
TO return to the cross section data click
ENTERING GEOMETRIC DATA IN HECRAS SAROJ KARKI (MSc in Water Resources Engineering,IOE, Pulchowk Campus)
You will get back to the cross section data as shown below.
Now to add a new cross section immediately D/S of this cross section, Go to Options tab as above
and Click add a new cross section.
And proceed as above.
ENTERING GEOMETRIC DATA IN HECRAS SAROJ KARKI (MSc in Water Resources Engineering,IOE, Pulchowk Campus)
After you finish adding the cross section data you need to enter the Manning’s n value.
You can either give the Manning’s n value individually for each cross section or you can give globally
to all cross sections at once.
The procedure is mentioned below.
To enter individually for each cross section, Enter the value here. For Left overbank (LOB), Channel,
Right overbank (ROB).
To Enter the Manning’s n value globally i.e. applied to every cross sections at once.
Go to HECRAS main menu,
Click enter/edit Geometric data .
ENTERING GEOMETRIC DATA IN HECRAS SAROJ KARKI (MSc in Water Resources Engineering,IOE, Pulchowk Campus)
Click Tables –Manning’s n or k values
ENTERING GEOMETRIC DATA IN HECRAS SAROJ KARKI (MSc in Water Resources Engineering,IOE, Pulchowk Campus)
A Manning’s n value editor will appear.
Select a column. n#1 is for LOB,n#2 is for the channel and n#3 is for ROB.
ENTERING GEOMETRIC DATA IN HECRAS SAROJ KARKI (MSc in Water Resources Engineering,IOE, Pulchowk Campus)
Select a column n#1 for LOB
Click Set values
ENTERING GEOMETRIC DATA IN HECRAS SAROJ KARKI (MSc in Water Resources Engineering,IOE, Pulchowk Campus)
A new dialog box will appear prompting you to give the manning’s n value for LOB,
Enter the value.
Let’s give 0.04.Ok
The column n#1 will have values equal to 0.04 as we have assigned.
Similarly we can do for Channel and ROB as well.
After assigning the values for the LOB, Channel and ROB,Click Ok.
So in this way we can complete the cross section data input in the HECRAS.
