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Windmillprint-crop.jpg Yes it is possible to print a windmill with a 3D printer for a fraction of the cost of manufacturing one conventionaly. Learn more about open-source 3-D printing of open source appropriate technology for sustainable development.


Micro hydro scheme showing the power house, the penstock and the transmission lines
Microhydro power. Water power can be harnessed in many ways; tidal flows can be utilized to produce power by building a barrage across an estuary and releasing water in a controlled manner through a turbine; large dams hold water which can be used to provide large quantities of electricity; wave power is also harnessed in various ways. It is a technology that has been utilized throughout the world, by a diverse range of societies and cultures, for many centuries. Water can be harnessed on a large or a small scale. Micro-hydro power is the small-scale harnessing of energy from falling water; for example, harnessing enough water from a local river to power a small factory or village. This fact sheet will concentrate mainly at micro-hydro power.

In the UK, water mills are known to have been in use 900 years ago. Their numbers grew steadily and by the 19th century, there were over 20,000 in operation in England alone. In Europe, Asia and parts of Africa, water wheels were used to drive a variety of industrial machinery, such as mills and pumps. The first effective water turbines appeared in the mid 19th century and it was not long before they were replacing water wheels in many applications. In contrast to water wheels and the early turbines, modern turbines are compact, highly efficient and capable of turning at very high speed. Hydropower is a well-proven technology, relying on a non-polluting, renewable and indigenous resource, which can integrate easily with irrigation and water supply projects.

FBP Nutsy

Nutsy, the modified Universal Nut Sheller for home use.

Albert Einstein
Out of clutter, find simplicity. From discord, find harmony. In the middle of difficulty lies opportunity.

Albert EinsteinW
Planted cattails at Millcreek greywater
Greywater, sometimes also spelled as graywater, grey water or gray water, is all of the effluent water from a household, such as water discharged from lavatories (bathroom sinks), bathtubs, showers, clothes washers, and laundry trays. Greywater is not wastewater from a sink used for food preparation, or water closet (toilet) wastewater.

The water leaving our homes carries nutrients and value. It may also contain pathogens, and/or harsh chemicals and care should be taken with it. However, it is not a great risk compared to blackwater (sewage).

Redirecting the water we use for tasks such as showering allows us to reclaim some of that value to grow plants and recharge the water table. It may be necessary to choose our soaps and detergents more carefully, if we use the greywater for watering and fertilizing plants.

Main portal: Water
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HSU Chiapas Program 2010: Humboldt State University's 2010 summer immersion in Appropriate Technology and Spanish Language & Culture took place in San Cristóbal de las Casas, Chiapas, Mexico. In 2010, we worked with Otros Mundos and various community members in San Cristobal de las Casas and near Acteal to collaboratively build three improved cookstoves, three rainwater catchment systems, windbelt prototypes, microhydro power feasibility studies, and a biogas digestor.

Practivistas Chiapas 2010 Projects
HSU Chiapas improved cookstoves
Improved cookstoves at Otros Mundos and in a rural community
(en español)  
HSU Chiapas micro hydro feasibility study
Microhydro feasibility study in a few rural communities
(en español)  
HSU Chiapas Windbelt ASE
Windbelts at Otros Mundos
(en español)  
HSU Chiapas biodigester
Biodigester at a demo house in San Cristobal  
HSU Chiapas rainwater catchment
Rainwater catchment systems at a demo house and in a rural community
(en español)  

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