Mr. Brian Raison, 
Ohio State University Extension,

Dear Mr. Raison,

Thanks for the following links provided:

http://ohioline.osu.edu/ws-fact/0001.html 

Yes these links are useful, as far as looking at the whole area covered by an industrial infrastructures, as an integrated watershed. But consider that many industrial plants need potable water, sanitary water, fire fighting water, plant water, cooling water, cooling tower make-ups, demineralized water used for boiler feed water, etc. Consider if a segregated sewage system is spared only for rainwater, all over an industrial plant, collecting all rain water therefrom, and combining all other harvested rainwater from different sections of the industrial watershed, such as landscape, office buildings, and the like; a good quantity of rain water could be collected to satisfy a very good supply for services like cooling tower make-ups, boiler feed-water conditioning units, etc., considering that rain water is almost pure with less than 10 mg/L of TDS. As such, treating rainwater to be used for boiler feed water, and the like will be much much cheaper in comparison to other sources of water supply. That is the main target which will compensate any investment on the rainwater harvesting on industrial sites.

These are the issues that I have in mind and am wondering if they are already considered anywhere.

Best regards,
Mashallah Ali-Ahyaie

Hello Frank,

    Thanks for your kind positive stance. You are right  more have been done on rainwater harvesting on homes and commercial buildings, here and there around the world, to certain extents, to be used  mostly for as gardening water, washing purposes, potable water and the like, but it looks like industrial sites are lagging behind. 

    If not exaggerating, every drop of water is as precious as a pearl grain. But there are a great ignorance worldwide regarding rainwater harvesting. Hopefully all communities, sooner or later, consider the planet earth as a gargantuan bucket, with many many small buckets inside, for harvesting rainfalls in a clean manner, before causing so much problems as uncontrolled run-offs; serving humanity as the rainwater deserves.

    I wonder if appropriate buckets are there, on the industrial sites, around the world, in which much more potentials are therein for using rainwater in higher values. 

    On the priority basis, harvested rainwater should be first used where a softer and purer water is most needed. That is where on the industrial sites usages for the harvested rainwater, there are two very good candidates, among other ones; feeding the water demineralization 

units and cooling towers make-up.

Best regards,
Mashallah

Hello Frank,

    I referred thereto, to the negligence. Yes, the humanity has been trapped very badly, in negligence regarding the values of rain drops which are valuable as pearl grains. They ignorantly let them becoming runoff streams, becoming polluted and running further into floods; devastating our cities. On the other hand, industries highly proliferate the underground waters, and more strangely put a lot of efforts, use a lot of energy and chemicals, with so much investment on the related processes, to make it a softer and purer water, as rainwater was before, when originally dropped; for using in their industrial plants sites.

Best regards,

Mashallah