Create or edit Time Series objects.
|
Icon |
Command |
Shortcut Key |
Toolbar |
|
|
STORMSWMMEDITTIMESERIES |
|
|
Time Series objects are used to describe how certain object properties vary with time. Time series can be used to describe:
Temperature data.
Evaporation data.
Rainfall data.
Water stage at outfall nodes.
External inflow hydrographs at drainage system nodes.
External inflow pollutographs at drainage system nodes.
Each time series must be given a unique name and can be assigned any number of time-value data pairs. Time can be specified either as hours from the start of a simulation, or as an absolute date and time-of-day.
For rainfall time series, it is only necessary to enter periods with non-zero rainfall amounts. SWMM interprets the rainfall value as a constant value lasting over the recording interval specified for the rain gauge that utilises the time series. For all other types of time series, SWMM uses interpolation to estimate values at times that fall in between the recorded values.
For times that fall outside the range of the time series, SWMM uses a value of 0 for rainfall and external inflow time series, and either the first or last series value for temperature, evaporation, and water stage time series.
Procedure
The Time Series Editor displays.
|
Element
|
Description |
|
Time Series Name |
User-assigned time series name. |
|
Time Series Selector |
Select the time series to edit. |
|
Add |
Click to add a new time series to the project. |
|
Delete |
Click to delete a time series from the project. |
|
Description |
An optional comment or description of the time series. |
|
Time Series |
Date - As calendar date/time of day. Elapsed Time - As elapsed hours since the start of the simulation. |
|
Start Increments on Date |
Select a date to start the time increments on, for the Date option. |
|
Start Increments on Time |
Select a time to start the time increments on, for the Date option. Start time is always 0:00 for the Elapsed Time option. |
|
End Increments on Date |
Select a date to end the time increments on, for the Date option. |
|
End Increments on Time |
Select a time to end the time increments on, for both options. |
|
Elapsed Days |
Enter number of days for the duration of the time series for the Elapsed Time option. Elapsed days is used in conjunction with the end time. |
|
Increment Step |
The time increment that the time series must be generated on. |
|
Days |
Select the Days option and enter a number of days if the time increment must be larger than 23 hours and 59 minutes. |
|
Array |
Table of time increments versus time series numerical values. |
|
Generate |
Click to generate the time series. The time increments display in the Time column for the Elapsed Time option, and the Date column is greyed out. |
|
View |
Click to view a graphical plot of the data in the array page. |
|
Load |
Click to load in a time series that was previously saved to file (See Time Series Files for the format of such files). |
|
Save |
Click to save the current time series to a file. |
|
OK Button |
Click to accept the current entries. |
|
Cancel Button |
Click to cancel the function. |