RE: water pump
D.K.V. you could use an automotive windshield washer pump which shoots a good volume of water. You can get them from any automotive wrecking yard or automotove parts store. Watch that you don't get one that goes in the washer fluid tank, you want one that mounts on the fender, separate from the tank. Of course these pumps will run on 12 volts, so depending on what voltage you are running your boat on, you may have to put a second battery in the boat to run the pump, or special order a 6 volt pump from an automotive parts supplier. You can also have you uptake tube mounted behind you propeller. The faster you go, the more water it will push up the tube. As long as your propeller is turn, it will push water up the tube.