Average water demands 2

[ALeahy]

When using standard unit demand figures to calculate annual commercial/industrial water demand (ie. xxx gpd/square foot or xxx gpd/acre), should these figures only be multiplied times the estimated number of days the business will be open, or do the unit demands reflect a value that has been averaged over a 365 day year? I have never seen any qualifying statement that says how these numbers should be used. Any informed opinions out there?

 

[chicopee]

My opinion; I would base my calculations when the commercial and industrial sectors are opened for business.

 

[bimr]

You have to use some judgement as some businesses only operate 8 hours per day, 5 days per week and some other businesses may operate 24 hours per day, 365 days per week.

 

[TGLG]

You might try comparing your water demand numbers to your wastewater generation numbers. Typically the volume of potable water going into a building is approximately equal to the wastewater coming out of it.

And don't forget to include water used for irrigation/lawn sprinklers when computing your water demand.

 

[waterpipe]

Could you please explain why you want to reach yearly amount from gpd/square foot? If you want to design the water supply system, then you should look to your system peak flow (daily, hourly) rather than the total amount of water needed yearly. If you are up to do a water resource management, then look to your water system design and ask for the annual Average Day Demand.

Anyhow, when you say gpd/square foot, is it gallon per day per square foot? Then why you should be concern of the working hours? you've already have it in day so multiply it with 365 days to get the yearly amount.

what do you think?

 

[waterpipe]

And of course some businesses run 5day per week. It's up to your judgment to consider it 5 or 7 days a week. IMO, we are all going to work 7 days to pay the debts, or wait; may be there would be no working at all!