Thiessen polygon+Inflow(Run-off)

Question

Hi 
 In a santary Network, I have some loads for some manholes as Dry weather load, Also I should add 10 lit/day/m2 as runoff inflow and run the netwrok as steady st 
 I have provided a shape file from Thiessen polygon. 
 How can I establish inflow from =10 lit/day/m2 x Contributed area of each manhole (Thiessen polygon) and assign to manholes. 
 
 Thanks 
 
 Hamid

Jesse Dringoli · Accepted Answer

I haven't heard of this approach before, but if I understand correctly, one possible way to do it would be to use the Projection by Land Use method in Loadbuilder, selecting your Thiessen polygon as both the service area layer and land use layer. Set the load density unit to L/m^2/day and enter 10 for each one. If there are too many manholes in the list, you could create a separate, single polygon surrounding the whole model and use that for the land use type. To do this in the standalone version, add the thiessen polygon as a background layer, lay out a catchment that overlaps the boundary, then export it to shapefile using the button in the upper-left corner of the catchment flextable. 
 
This will multiply the area (in m^2) of each thiessen polygon times 10 and express in L/day as a load on the associated manhole. 
 
You may also want to look into the RTK method for RDII. You can read about that in the Help or in the Wastewater Collection Systems Modeling and Design Book: 
 
http://www.bentley.com/en-US/Training/Products/Resources/Books/WCSM.htm

Jesse Dringoli · Answer

Wastewater Collection System Modeling and Design, Chapter 7.6, starting page 254. Chapter 9.3 (starting page 309) also talks about RDII.