by Slick470 » Sun Nov 03, 2013 1:43 pm
Olaf, most of it comes down to liability, but in practice, nothing in the rainwater collection system is listed for use in potable water systems except the copper piping that actually supplies the urinal. From the roofing materials, the black steel roof drains and rain leaders, to the plastic holding tank. The biggest offenders are the roofing materials and plastic holding tanks. Both are most likely made of materials that will leach chemicals into the water. Plus the urban enviroment isn't the best natural filter for rainwater runoff.
The irony of it is, the water that would normally be going to that urinal is supplied by the same piping system that supplies the sinks and drinking fountains in the building. Meaning that the toilet water would normally be potable. A large portion of the world has drinking water that we Americans wouldn't touch, but we'll take a shit in water that they would love to have.
The rainwater collection system in use in OM's office is one of the technologies that the "green building" industry that the US has listed as a way to conserve resources. In practice they save water, but they require separate piping systems and due to their dedicated pumping systems, they increase energy usage in the building. So, by themselves I'm not sure if they actually save energy, but when used in conjuction with other energy saving methods, the idea is that you end up with a building that is better for the enviroment as a whole.
Andy
I can't complain but sometimes I still do...