Pump calculator Applet

Above is the java pump calculator applet, which demonstrates how to calculate the yield  from your pulser pump site. You simply input the height of your dam,   the flow of water in your stream, the height that you are pumping to and click calculate. Its easy!
I have put in the details in half meter increments because the system is nonlinear. The numbers are based on my own experimental results. (Mostly with a small pulser pump optimized for pumping to about 4 meters).
I am confident that you can beat these results (I erred on the conservative side when doing the calculations).
Please give me feedback on this.   It was a big deal to learn that much java!
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Brian White 5th November 00