The newer option for SWMM5 culverts uses three culvert classifications and associated equations to compute the inletcontrolled flow into a culvert using the FHWA (1985) equations. The culvert code in the culvert.c code of SWMM5 uses:
High and Low Estimates of ICM Subcatchment Dimension for SWMM Hydrology
These are the estimates for both SWMM 5, InfoSWMM and ICM SWMM Hydrology, the low estimate is 0.2*SQRT(Area in Feet) and the High Estimate is 5*SQRT(Area in Feet), Figure 1. You can use higher or lower numbers to calibrate … Read the rest
The three Run manager parameters, Maximum Number of Segments, Minimum Travel Distance and the Minimum Travel Distance in InfoSewer and H2OMAP Sewer affect the shape and flowattenuation of the flow in a link. The effect of using the flowattenuation is to reduce the peak … Read the rest
The Junction Graph variables for 2D Depth, 2D Speed, 2D Froude Number, 2D Unit Flow, 2D Inflow, 2D Volume and 2D Angle for a InfoSWMM2D simulation for up to 1000 years can be plotted in the Report Manager of InfoSWMM. This is an image … Read the rest
Subject: How are NegativeTransectElevationsUsed in SWMM5?
You can have negativeelevations in the Transects of SWMM 5 as the elevations are transformed internally to relative depths above the node inverts in the SWMM 5 engine (Figure 1). The slope of the link is calculated from the … Read the rest
Subject: How is CapillarySuctionHeadUsed in SWMM5Green–Ampt?
How sensitive is the infiltration loss and rate to the capillarysuctionhead parameter in the SWMM5Green–Ampt infiltration method. Figure 1 shows how the total infiltration loss and total loss rate vary … Read the rest
Subject: How is the SoilSaturatedConductivityUsed in SWMM5Green–Ampt?
How sensitive is the infiltration loss and rate to the SoilSaturatedConductivity parameter in the SWMM5Green–Ampt infiltration method. Figure 2 shows how the total infiltration loss and total loss rate … Read the rest
If you are using the SWMM5 Rainfall Dependent Infiltration and Inflow(RDII) feature you can also use the RDIIstorage parameters to change the RDII runoff by simulating the storage in the Sewershed. The code in RDII.C … Read the rest