I have designed many  ...

I have designed many  systems. Flood control/drainage are within my prevue.  We will have to discuss which you prefer. All inclusive or a new cutting edge technology.  Just as an example. The average size tree has the respiration rate of 300 gallons of water a day.  Calculate amount of flood waters in a drainage zone and then plant trees sufficient for a 10 year, 50 year or a 100 year flood.  To reduce the cost of the program plant hard wood trees with nuts like pecan, walnut and others.   Many other equally simple and economically beneficial examples.  You may use skype to communicate.   guy_mcgowen   Hope this helps.  If you live in Netherlands you may want to look at the new accelerated poder building technology.    Wees Voorzichtig. (Take care).