I need to buy a submersible water pump for a pondless waterfall. How large of a pump should I buy?

There is 18 to 20 ft of head pressure and I want to pump about 1200 gallons per hour.I need to buy a submersible water pump for a pondless waterfall. How large of a pump should I buy?There are several website that where you can buy a pump. I suggest you try one of these.



http://www.watergarden.com/



http://www.pondliner.com



http://www.thepondguy.com



Buy a mag-drive pump, they are usually the best choice.



These sites also sell weir boxes that help provide a smooth flow of water at the start of the water fall and are rated for various flow rates. This way if you have an idea how wide you want the fall to be, you can control it by the weir box you purchase.I need to buy a submersible water pump for a pondless waterfall. How large of a pump should I buy?WHP=Qxh/3960

For 20 gallons per minute and 20 ft head you need a pump of 0.101 hp=75.3 watt.I need to buy a submersible water pump for a pondless waterfall. How large of a pump should I buy?If this is for a home water feature project check your local building supply and get the biggest pond pump you can afford, otherwise you will be disappointed with the flow. It takes a lot more than you think to look good.