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FAQs about WEc1 :

Can non-potable well water that is used for irrigation contribute to potable water reduction?

Can surface water, such as water from an irrigation ditch or a local creek, be used as nonpotable water?

Do interior planters count in the calculation?

We are using non-potable water for irrigation. For drought conditions, can we hook up to a potable water source for backup and still earn this credit?

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NC-2009 WEc1:Water Efficient Landscaping

Efficienty of permanent hose irrigation

We've posted this question here a few times before but no response... Does anyone know which efficiency should we consider for landscape that will be irrigated manually, by hose? Reference Guide only provides efficiency for sprinklers (0.625) and drip (0.90), and neither fit our case. We know a hose is not a very efficent irrigation system but we are using native/adapted plants and they require little water. But even so, sometimes they will require some water and to do so the project will use a hose. Any thoughts on how to approach that? Any numbers for the hose irrigation efficieny? Thanks!

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Kathryn West
LEED AP BD+C, O+M, Green Globes Professional
JLL
LEEDuser Basic Member
112 thumbs up

Tue, 05/07/2013 - 15:34

The reference guide says "hose bibs are not considered permanent irrigation and can be used for temporary irrigation during periods of drought" (pg 183) You may want to search the LEED Interpretations database for the word "hose" to make sure there isn't anything specifically disallowing the way you plan to water. Theoretically, if your plants are native/adapted and well suited for the environment they shouldn't need watering unless there is a drought. It's a bit tricky. Maybe you could supply this limited amount of water using harvested rainwater. That would be a more clear cut way to meet the intent of the credit. Also, maybe look at amending the soil so that you only need to water under drought conditions.
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Simon Sue
SL+A INTERNATIONAL ASIA INC.
LEEDuser Premium Member
305 thumbs up

Mon, 01/20/2014 - 03:00

I know that you've posted this question many times, and unfortunately I have no answers... but we are working on international projects where manual watering is the normal condition as well. I was just wondering if you might be able to share any more information you have learned? Did you submit your project and receive any further guidance from the reviewers? Thanks!

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