Quick Answer
To build a solar still for water collection, start by digging a shallow depression in the ground and creating a container to collect the condensed water. Place a small rock or object in the center of the depression, then add a small amount of impure water to the depression. Weigh down the center rock with additional rocks to create a slight depression.
Preparing the Site
Choose a spot for your solar still that receives direct sunlight for at least 6 hours a day. The location should be slightly elevated to prevent water from flowing away and ideally have a slight slope to allow for proper drainage. Mark out a 1-foot square area for your still and begin digging a shallow depression about 1-2 inches deep.
Building the Still
Place a shallow container, such as a plastic plate or tray, in the center of the depression. Add a small amount, about 1-2 cups, of impure water to the container. Create a slight depression in the center of the container by placing a small rock or object. Weigh down the center rock with additional rocks to ensure proper condensation.
Collecting Condensed Water
As the sun heats the water, it will evaporate and condense on the underside of any clear plastic sheeting, such as a plastic bag or a clear plastic container. Place the plastic sheeting over the container, weighing down the edges with rocks to prevent wind from disrupting the condensation process. The condensed water will drip down and collect in the container.
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