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Santa Barbara Urban Hydrograph
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UK Unit Hydrographs
Sub-catchments may be entered in the form of a Time/Area spreadsheet. The hydrograph is calculated by combining the rainfall profile with the time area input. The Time / Area diagram accounts for the effect the time of flow into the stormwater control has on the inflow hydrograph.
Spreadsheet
Enter the area that enters the storage structure for each timestep.
<= Time
The time area diagram may be specified at a user defined set of time steps.
Area
The area that enters for the given time period, that is from the time entered to the time below.
Import and Export
These allow the current Time Area Diagram details to be imported from and export to file so that the details can be reused.
Clear
The clear button clears the contents of the table.
The rainfall profile and the time area diagram are combined with the volumetric runoff coefficient in the following way:
Q1 = (I1 x A1) x 2.78 x Cv
Q2 = (I1 x A2 + I2 x A1) x 2.78 x Cv
Q3 = (I1 x A3 + I2 x A2 + I3 x A1) x 2.78 x Cv
And so on…
Section Pages
Workflow - What's next...?
Inflows connect to either Junctions or Stormwater controls via Inlets. Specify an Outlet on these objects then choose to connect to another Junction or Stormwater Control.
Previous:
Santa Barbara Urban Hydrograph
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UK Unit Hydrographs