RPA Report View

The Return Period Analysis report calculates the return period for events causing surcharging and flooding within a particular system. The return period is the average period between occurrences of an event greater than or equal to a given value. The report lists the results of simulations produced using design storms.

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For each conduit, the grid shows the following values:

Upstream Node ID	Upstream node
Link Suffix	Used with the Upstream Node ID to identify a specific link
Min RP Surcharge	Minimum return period to cause surcharge in conduit
Min RP Flood	Minimum return period to cause flood at upstream node
Critical Duration	Length of storm in minutes that caused the greatest flooding at the upstream node
Critical Duration Flood/Lost Volume	This is the total flood volume, or total volume lost, at the node in a storm of the critical duration and the minimum return period that causes flooding
RPA	The RPA table displays the minimum return periods that caused surcharging and flooding. The entries in the table are in the format: Min RP Surcharge - Min RP Flood An asterisk (*) after the surcharging return period signifies surcharging by flow. A return period may be replaced by an x under the following conditions: Return period has a value greater than the maximum Return Period value chosen in the RPA Grid Report Dialog. Minimum return period that caused flooding cannot be determined because flooding did not occur during any of the simulations selected (in the RPA Grid Report Dialog) for use in producing the report. For example, an RPA value of 5-x means that a return period of 5 years caused surcharging in the link, and a return period of more than the maximum caused flooding at the upstream node (or the return period causing flooding at the upstream node could not be determined from selected simulations).

For further details on the Return Period Analysis report, and instructions on how to generate a report, see Grid Reports.

Grid Reports

Return Period Analysis Grid Report Dialog