There was a change in EPA SWMM 5.1 to better represent Weekend vs Weekday
Hourly flow patterns
1. Scenario Name
2. Junction ID for the node that receives the DWF
3. The item – either FLOW, MASS or Concentration (Use Blockedit to just
set this at Flow for all Rows) and you should fix your problem.
4. Value – the flow in the units defined in the Run Manager
5. Pattern1 – Can be Weekend, Hourly (Weekday only), Monthly or Daily
patterns. They can be in any order but Hourly only applies Monday to
Friday.
6. Pattern2 – Can be Weekend, Hourly (Weekday only), Monthly or Daily
patterns. They can be in any order but Hourly only applies Monday to Friday.
7. Pattern3 – Can be Weekend, Hourly (Weekday only), Monthly or Daily
patterns. They can be in any order but Hourly only applies Monday to Friday.
8. Pattern4 – Can be Weekend, Hourly (Weekday only), Monthly or Daily
patterns. They can be in any order but Weekend only applies to Saturday and
Sunday.
9. Alloc Code which is a tag from the DWF Allocator
It used to be that the two hourly patterns were applies as
… the week end flows are generated in the model by
multiplying Node DWF x Hourly x Weekend x Daily x Monthly.
But now
… the week end flows (Saturday and Sunday) are generated in
the model by multiplying Node DWF x Weekend x Daily x Monthly.
… the daily flows (Monday to Friday) flows are generated in
the model by multiplying Node DWF x Hourly x Daily x Monthly.
