AutoCAD Civil 3D General

New Member
Posts: 2
Registered: ‎03-13-2014
Message 1 of 3 (181 Views)
Accepted Solution

Hydraflow Storm Sewer System Outfall Q

181 Views, 2 Replies
03-13-2014 06:04 AM

I am using the Hydraflow Storm Sewers Extension 2012 and I keep getting different Q's at the outfall depending on the calclulation option I choose.  It seems like I need to toggle "Analysis w/Design" and then toggle "Reset Pipe Sizes" to get the system outfall Q.  If I only toggle "Analysis w/ Design" the Q drops drastically.  Does anyone know the proper Calculation option to get a system Q at the outfall for a given event if you only want to analyze the system without making changes?  Thanks!!

*Expert Elite*
Posts: 2,749
Registered: ‎04-27-2005
Message 2 of 3 (169 Views)

Re: Hydraflow Storm Sewer System Outfall Q

03-13-2014 08:15 AM in reply to: bjohnson14

Do you have any surcharged structures? The flow will pond at that point until it can continue to flow through the system reducing your max Q.


Alternatively, that flow might be lost from the system, off the top of my head, I can't remember which.

New Member
Posts: 2
Registered: ‎03-13-2014
Message 3 of 3 (164 Views)

Re: Hydraflow Storm Sewer System Outfall Q

03-13-2014 08:23 AM in reply to: BrianHailey
Thanks for the response. I just figured out what it was. I did not have flow in an inlet and that was messing with the whole system. It now computes correctly. Thanks again.

You are not logged in.

Log into access your profile, ask and answer questions, share ideas and more. Haven't signed up yet? Register

Are you familiar with the Autodesk Expert Elites? The Expert Elite program is made up of customers that help other customers by sharing knowledge and exemplifying an engaging style of collaboration. To learn more, please visit our Expert Elite website.

Need installation help?

Start with some of our most frequented solutions to get help installing your software.

Ask the Community

Civil 3D Exchange Apps

Created by the community for the community, Autodesk Exchange Apps for AutoCAD Civil 3D helps you achieve greater speed, accuracy, and automation from concept to manufacturing.

Connect with Civil 3D