Has anyone found a good spreadsheet/website that calculates the approximate size of a rainwater tank needed for a given roof area and water usage?

If a project treats 100% wastewater and reuses it for irrigation except the treatment in done through local govt utilities service provider, can the project claim point under Innovative Waste water

We are working on a large scale City Garage project targeting LEED Silver certification. We are considering rainwater harvesting and using it to meet the demands of truck washing.

Our building is on a college campus and we plan to route all condensate to the campus grey water system. Does this qualify even though it is not being used on-site?

Under the Bird's Eye View here for WEc2, there is a citation of LEED Interpretation #10012 made on 05/09/2011 which states "projects may only count future infrastructure such as reclaimed water sys

LEED template use the flush fixture water which calculated based on occupant usage.

We are trying to pursue this credit, by using municipal 'brackish' water for irrigation and toilet flushing.

Can anyone who submitted a CIR for Option 2 regarding a campus situation post your results?

I am finding it hard to locate a 1.0 or a dual flush 1.6/.8 toilet and flushometer. Where did the data come from in the sample calculations? Lyn