Indoor Water Use Reduction Calculator v4.0

Dung Bui

LEEDuser Basic Member

0 thumbs up

Project location :

Vietnam

September 5, 2019

Hi everyone,

I'm currently working on the credit Indoor Water Use Reduction (Calculator 4.0 excel sheet) and have a question concerning fixture's design flow rate.

The fixtures used are showerhead (5.0 lpm) and shower mixer (6.1 lpm).

What should I input here in the Design Flow Rate? (5.0 or 6.1)

Is there any part in LEED v4.0 that mentions which to choose?

Thank you so much!

Post a reply

emily reese moody

Sustainability Director, Certifications & Compliance

Jacobs

LEEDuser Expert

469 thumbs up

Fri, 09/20/2019 - 01:56

I encourage others to speak up here, but in my experience, the rates are based on the showerhead, itself, since that is what ultimately restricts the flow. So you would use the 5.0 value.

David Posada

Integrated Design & LEED Specialist

SERA Architects

LEEDuser Expert

1361 thumbs up

Tue, 09/24/2019 - 19:18

I would agree.

Gregory Mason

LEEDuser Basic Member

1 thumbs up

Fri, 10/16/2020 - 00:14

A bit late to the game, but what about the other way around (showerhead 7.5 L/min; mixer rated at 6.0 L/min). Would we be allowed to use the lower mixer rated water use?

emily reese moody

Sustainability Director, Certifications & Compliance

Jacobs

LEEDuser Expert

469 thumbs up

Mon, 10/17/2022 - 16:50

Hmm...if you have the cutsheet for the mixer, and it restricts the water before it reaches the showerhead, I would think you could use the lower value. I have had projects have flow restrictors directly on the line and be fine - this happened when the wrong lav was installed and the project had to fix the issue after the fact, but couldn't alter the faucet, itself. Just be sure to explain this with a narrative that goes with your calculator, likely in the Special Circumstances box on the form.