FarmHack Projects: Paddlewheel-Powered Pump

drawing of a Wirtz pump
drawing of a Wirtz pump

Here is a great video made by Jeremy Smith of a water pump built by Cappie of Pangea Farm in Spearfish, SD. The pump, which is a “Wirtz pump”, uses a coil of hose and a scoop which are turned by a waterwheel in an irrigation ditch, pumping water 30′ or more vertically into a holding tank, from where it can then gravity-feed into livestock tanks, drip irrigation, etc.  This version pumps about 1 gallon per minute, depending on the flow of water through the irrigation ditch.

Passive Water Pump from Jeremy Smith on Vimeo.

Wirtz pumps have been around for a few hundred years, but haven’t been used much since steam powered pumps came along. Click here for a great resource about Wirtz pumps and the science behind them, as well as further details about the pump that was built at the Windfarm Museum in New Hampshire. Their pump uses “6 foot diameter wheel with 160 feet of 1-1/4 inch inside diameter flexible polyethylene pipe is able to pump 3,900 gallons of water per day to a 40 foot head with a peripheral speed of 3 feet per second.”

They also ran experiments that confirm that these pumps work quite well regardless of how quickly the water source (stream/irrigation ditch) is moving. The amount of water pumped increases pretty linearly with the water speed, but even at very slow speed the pump still operates at about the same overall efficiency.

Materials used in the Pangea Farm version (total cost = ~$250)

For the paddle wheel:
– Heavy cable spool (from local utility company junk pile) for the wheel;
– Cedar 1″ thick boards for paddles;
– Paddle wheel axle, either very heavy gauge tube, or 2″ solid stock, machined at end to accept inlet of the main coil;
– Pillow block bearings to hold the axle (worth the extra cost for their durability and ability to absorb lateral force if axle is out of square with mounts).

For the scoop and coil:
– 4″ pvc scoop with wire mesh screen and reducer fittings, to scoop water into the main coil;
– Check valve between scoop and main coil, so water doesn’t flow backwards;
– Compressed air port at scoop end of coil (for blowing water out coil for winter storage);
– 100′ of 1″ poly hose, coiled on paddle wheel
– Waterproof swivel joint, joining rotating axle to the stationary pipe carrying water to holding tank.

For the storage tank and outlets:
– Reclaimed telephone poles to hold the tank up high;
– Water tank (500 gal, fills in ~8 hours);
– 1″ water line and filter from tank to irrigation system;
– Overflow line to return water to ditch when tank is full.

Lots of possibility for modification for other uses!

Farm Hack Tools: Barrel Water Collector

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This project comes from:

Make: Projects @http://makeprojects.com/Project/Barrel-Water-Collector/275/1

From the authors: Chris and Michri Barnes

Title:

Barrel Water Collector

Who the project is for:

Small Scale Farmers & anyone with an interest in sustainability

Range of how much it might cost to build:

probably less than $85

What skills are necessary to complete it:

You will need to use a drill, otherwise the directions should get you through everything else.

Summary of the project:

Many people let the rainwater that falls on their roof run off, then they use drinking water piped in from afar for washing floors and watering plants. Here’s a handy, mosquito-proof rain barrel we put together that stores 55 gallons of recycled water and adds a handsome accent to our yard. It’s especially valuable during droughts, and if you’re in a rural area with wells and electric pumps, it also means being able to flush the toilet when the power goes out.

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