2.0

Chapter 2 Working with Ponds
146
Displaying Multiple Hydrographs
To compare pre- and post-development hydrographs with the routed
hydrograph, use the Multi-Hydrographs option.
To display multiple hydrographs used in the calculations
1 From the Storage Indication Method dialog box, click Multi-Hydrographs to
display the Multi-Hydrographs dialog box.
NOTE
If you do not see a graph, be sure you have specified the curves to use in
the calculations.
2 Do one of the following:
If you want to} Then click}
change the hydrographs settings Settings.
plot the data on a graph and insert the
graph in your drawing
Plot.
output the data to an ASCII or .wk1 file Output.
3 Click OK to close the Multi-Hydrographs dialog box.
Adding and Editing Outlet Structures for Ponds
Use the Outflow Editor commands on the Hydrology menu to attach inflow
and/or outflow structures to a defined pond. You can attach these structures to
a defined pond in one of two ways: by specifying a defined pond and by
specifying a stage-storage curve data file. You can also directly open a file
previously saved through the Pond Outflow Design dialog box using the
Outflow Editor ä Editor command.
Use the Outflow Editor commands to save the stage-discharge data as a stage-
storage curve (sdc file) or as a rating curve (.rtc file). You can use these files to
calculate pond routing when using the Storage Indication Method command or
the Detention Basin Storage command.
Adding and Editing Outlet Structures to a
Pond - By Pond
You can use the Outflow Editor commands to design multiple stage inflow and
outflow structures for detention ponds, thus providing the tools required for
attenuating different frequency storms. This process is typically one of trial and
error. You can begin with approximate sizes of the inflow and outflow
structures, and then refine your design by changing the structures dimensions
or by modifying the shape of the pond.