While calculating Spread it is necessary to provide road cross slope, Gutter slope and longitudinal slope in catch basin flex table and road cross slope and gutter cross slope in gutter flex table twice or it is sufficient if we only provide in catch basin table?
Please find the following attachment.
There is a property "Same as Start Node" in the gutter properties which defines that the geometry would be same as the Start Inlet. In such a case the road cross slope, gutter slope and longitudinal slope provided a the inlet would be used. If the geometries differ you can specify these fields independently. Here is an article which explains this in detail;
Why does the gutter need to be defined in both the catch basin and gutter element?
Hope this helps.
Bentley Technical Support
Thank you so much for the information.Is the length of the gutter matters the spread results?
Also, does this program look for the pipe invert and catch basin invert (weather matched or not) while calculating spread? Because my pipes invert and catch basin inverts are flying though it is calculating spreads (However, I assigned correct parameters like rim elevation and all slopes whatever needed for spread calcs).
Hari Dhungel said:.Is the length of the gutter matters the spread results?
The length is considered because we are also specifying the longitudinal slope of the gutter which is factored in the calculation of spread.
Hari Dhungel said:does this program look for the pipe invert and catch basin invert (weather matched or not) while calculating spread?
Are you designing the inlets? If so then the design alternative will size the length of the inlet in order to meet a minimum inlet efficiency or capture percentage. The longitudinal slope is calculated from the invert levels at the upstream and the downstream catch-basins and the length of the gutter. In the spread calculations longitudinal slope is factored in. The program will not consider the connection or matching of the pipe invert and catch-basin invert as the spread calculations are dependent on the gutter hydraulics and not the pipe / conduit hydraulics.
Answer Verified By: Sushma Choure
Thank you so much.
Great help for me.