Bicycle Powered Water Pump for Rainwater Harvesting Systems

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Making Community Gardens Sustainable is an ongoing theme of this blog and of the work I do during the time when I am not blogging. My most recent project was to devise a human powered water pump using a bicycle. I have already worked with an engineering intern to design a treadle pump for the same purpose. A blog post describes that effort.

                                    Prototype drill pump on a bike blender

I felt this was a good solution but that creating a pump that worked with a bicycle might be even better for a number of reasons. Most people have a bicycle available to them and there are many used bicycles available for little or no cost. Bicycles and riding a bicycle are also more familiar to most people than a treadle pump. The bicycle could be used as a method of transport when not being used to pump water. Much like the treadle pump, using the bicycle to pump water would also be a form of exercise – a side benefit of this project.

                                   Bike pump using bicycle trainer set up

There are some notable efforts at devising human powered machines. In most cases these efforts are being done in developing nations by international aid organizations or students. A very interesting group is Maya Pedal in Guatemala. They have devised many pedal power machines including corn grinders, nut shellers and wood saws. Youtube has many videos of bicycle powered devices, most often showing ways to generate electricity using a bicycle. That was one direction to work on but I wanted to use the bicycle to drive a pump directly rather than to produce electricity to run the pump.

  Close up of the connection between the bike trainer and the drill pump

One idea I had was to use a drill pump. A small inexpensive device that can be attached to a power drill to pump out water in basements, swimming pools and other home uses. I just had to figure out a way to transfer the motion from a bicycle wheel  to the drill pump. My first attempt was to use a bicycle blender setup to turn the drill pump instead of a blender. I made a prototype which worked but seemed like too much power was lost doing it this way.

                        Set up showing connection to the rainwater tank

I then realized that the bicycle trainer that kept the rear wheel off the ground could be adapted to turn the drill pump directly. I made a video that explains how it is done.

With a little funding, hopefully several community gardens that can most use a bicycle water pump for their Rainwater Harvesting systems will get them this coming spring.

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