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Table Of Contents
Calculating Routing Values for Detention Basins
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2 Save the file with a .hdc extension in the c:\Land Projects R2\<project
name>\hd folder.
Creating an .sdc File to Use in Calculations
For calculating pond routing with the Storage Indication Method, a stage-
discharge file (.sdc) or a rating curve file (.rtc) is required. From the Hydrology
menu, you can create a stage-discharge curve or a rating curve file using the
Outflow Editor ä By Pond command (using the Plot button to create the
.sdc or .rtc file).
Or, you can use the following method to manually create the .sdc file.
To create a stage discharge curve data file for use in routing calculations
1 Open a text editor and create an ASCII text file using the following format:
n
Format the first line by starting the
line with #Units=.
n
Delimit the file data with commas
(e.g. 0.1,1.05).
n
Precede comment lines with a pound
(#) sign (e.g.
#Units=Time,hrs,Flowrate, cms).
#Units=Elevation,m,Flowrate,cms
#Stage-Discharge Curve Data
#Stage - m Discharge - cms
#------------------------------
0.00000000,0.00000000
0.25000000,0.28303000
0.40000000,0.56606000
0.55000000,0.84909000
1.95000000,5.66060000
2.05000000,6.22666000
2.15000000,6.50969000
2.25000000,7.07575000
2 Save the file with a .sdc extension in the c:\Land Projects R2\<project
name>\hd folder.
Calculating the Routing Values for a Reservoir or
Storage Facility
You can create the routed hydrograph for the detention pond by using the
Storage Indication Method.
Calculating the routed hydrograph is an iterative process of trial and error. For
example, you may have to return to the Pond Outflow Design dialog box and
design different inflow and outflow structures and possibly redesign the pond,
and then recalculate the outflow hydrograph in order to achieve the results you
want.
TIP
You should use the Pond Outflow Design dialog box to design the outflow
structures for the pond before using this command.
To calculate the routing values for a reservoir or storage facility
1 Create the necessary input files:
n
Post-development hydrograph file (.hdc). For more information, see
Creating an .hdc File to Use in Calculations in this chapter.
n
Stage-storage curve file (.ssc). For more information, see Creating an .ssc File
to Use in Calculations in this chapter.