AutoCAD Civil 3D - Stormwater

Active Contributor
Posts: 37
Registered: ‎10-25-2011
Message 1 of 1 (109 Views)

Sweeper Inlet Length

109 Views, 0 Replies
02-20-2012 09:14 AM

Using AutoCAD 2012 with SSA, FHWA HEC-22 Generic inlet.


When I put in a sweeper inlet with a curb opening length less than the grate length, the amount of flow captured is greater than just grate. Does this mean that the curb opening length is just the extra distance.


Ex. 2' grate with 4' curb opening (2' above the grate, 2' upstream)


Flow of grate = 2cfs

Flow with 1' grate =2.1cfs

Flow with 2' grate = 2.5 cfs

Flow with 4' grate = 3 cfs.


I thought HEC-22 was to ignore any curb opening placed over the grate, but this does not appear to be the case. Or am I missing something.





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