Rainfall harvesting

I consulted in China in a rainfall harvesting project and back home, in 2001 (?) I wrote an article in the local Water Engineers Journal. I received many calls from interested persons and also an architect interested in green buildings visited me. Later I consulted to Lior, a local entrepreneur who sold some 25 grey water reuse machines but they were not working. I tried but could not improve his design. Now I have this mikweh project (in fact, I dont have it yet) with a ritual need for rainwater. The field is very interesting, and I could become a guru in this interesting area. A note for myself.