Quick Answer
A 10x20 foot tarp is a good starting point for a rain catchment system due to its balance between collection area and ease of handling. This size tarp will provide a decent amount of water without being too unwieldy. A larger tarp can be used but may require more support and additional labor.
Tarp Selection and Setup
When selecting a tarp for rain catchment, look for one with a waterproof coating and a sturdy material that can withstand wind and precipitation. The tarp should be at least 6 mils thick to prevent tears and punctures. A 10x20 foot tarp made of heavy-duty nylon or polyester is a good option.
Rainwater Collection and Containment
To maximize collection, position the tarp at a 45-degree angle to the wind direction to allow water to flow directly onto the tarp. Use rocks, sticks, or other natural materials to secure the tarp to the ground. Create a lip around the edges of the tarp by weighting down the corners with rocks or sandbags to prevent water from spilling over. Use leaf funnels or small gutters to direct water from the tarp into a collection container.
Improvising Collection Containers
To create a collection container, gather a large, waterproof container such as a plastic barrel or a hollowed-out log. If a container is not available, improvise one by digging a shallow depression in the ground and lining it with a waterproof material like a tarp or a plastic bag. Place a series of rocks or sticks in a funnel shape leading into the container to channel water in.
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