ICPR Culvert Routing

[Hfreeman]

I am analyzing a SW management plan done in ICPR and I the outlet rating curve for a box culvert is not matching up with a reating table I computed using Culvert Master. (The ICPR flows are significantly higher for all stages >10% higher)

I have doubled checked all input parameters and everthing is consistent between the 2 models (ICPR and Culvert master). Mannings N, inverts, length, entrance and exit losses, wingwall shape and angle, bevels, etc....

Anyone know what methods ICPR uses to determine culvert rating curves? I need to know where these numbers are coming from.

I'm not saying that anything is wrong, just trying to verify the info before issuing a response to a client.

 

[TerryScan]

1)How is tailwater established in Culvert Master and how does that tailwater compare with tailwater in the ICPR model?

2)What are your ICPR settings for Entrance Loss Coef and Exit Loss Coef?

It is my understanding that Culvert Master uses FHWA HDS-5 methodology.

ICPR uses conservation of mass equations to establish volume (and elvation) at each node in the network for each time step. Dependant on the elevations in the end nodes, flows through links are computed on flow regimes established by the end nodes including open channel, partially full flow, pressure flow, and high submergence conditions. Inlet and outlet control conditions are considered. Entrance, exit and manhole losses are included.

I can see the potential for different calculations being performed.

If you don't get any answers here, you may want to contact Streamline Technologies (ICPR).