Quick Answer
A well-rigged tarp shelter can withstand heavy rain, but it depends on the tarp's material, size, and the quality of the rigging.
Choosing the Right Tarp
When selecting a tarp for heavy rain, look for a material with a waterproof rating of at least 10,000 mm. This typically means a nylon or polyester tarp with a silnylon or PU coating. A larger tarp (at least 9x12 feet) will provide more coverage and allow for a better pitched roof, reducing the likelihood of water running down the sides and into the shelter.
Rigging for Heavy Rain
To rig a tarp shelter for heavy rain, start by securing the tarp to two trees or anchor points, using a minimum of 6 feet of rope or cordage per anchor. Space the anchors about 8-10 feet apart to create a 30-40 degree pitch, which will allow water to run off easily. Use stakes or rocks to secure the tarp to the ground, and consider adding additional guy lines to keep the tarp tight and reduce flapping in strong winds. A minimum of 3-4 guy lines per side will provide sufficient stability.
Additional Tips and Considerations
When setting up a tarp shelter in heavy rain, consider the direction of the wind and the location of the tarp to minimize exposure. A south-facing tarp will allow for natural light during the day, while a north-facing tarp will reduce the risk of wind-driven rain. Additionally, consider using a tarp with a reinforced seam or a built-in fly to provide extra protection from heavy rain.
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