Plumbing Forum - Professional & DIY Plumbing Forum > General Plumbing Discussion > Plumbing Products > Floor drain calculations



Reply
 
Thread Tools Display Modes
Old 03-17-2014, 02:42 PM   #1
britkath
Junior Member
 
Join Date: Oct 2013
Posts: 27
Liked 2 Times on 1 Posts

Default Floor drain calculations

To calculate the GPM capacity of a floor drain, I found the following equation:
Q = 448.2 Cd A 2gh where Q = Flow Rate (Gallons per Minute)
Cd = Discharge Coefficient (Typically 0.6)
A = Open Area of Grate (ft2)
g = Acceleration (32.2 ft/s2)
h = Head Above the Floor (ft)

What is meant by head above the floor for h? the floor drain is flush with the floor.


britkath is offline  
 
Reply With Quote
Old 03-17-2014, 11:14 PM   #2
IFIXH20
HERE TO HELP
 
Join Date: Mar 2012
Posts: 948
Liked 236 Times on 187 Posts
Likes Given: 165

Default

If I'm not mistaken the head above the floor is the amount of water buildup on the floor. Engineering mumbo jumbo.
IFIXH20 is offline  
 
Reply With Quote
Old 10-11-2014, 03:23 PM   #3
wyrickmech
Junior Member
 
Join Date: Oct 2014
Posts: 5
Default

Get a code book,each size has a dfu (drainage fixtures units)which is how you size it.
wyrickmech is offline  
 
Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Field line options and calculations Zanne Septic Tanks 16 04-12-2013 01:07 AM
Garage Floor Drain jpm6621 General Plumbing Help 4 09-12-2012 04:13 PM
Floor drain backing up Swenny Drain and Sewer Cleaning 3 02-13-2012 05:07 PM
Floor drain to shower drain conversion gooch43 General Plumbing Help 1 11-22-2011 12:51 AM
What's up with this floor drain? josh4377 General Plumbing Help 9 06-04-2011 08:16 PM

Newest Threads

LATEST SPONSOR DEALS