Quick Answer
A good drainage system for outdoor shelters involves creating a slope to direct water away from the structure, using materials that allow for water to pass through, and ensuring the ground around the shelter is free of debris.
Sloping the Shelter Base
When building a shelter, it’s essential to create a slope to direct water away from the structure. Aim for a 1:20 to 1:25 slope ratio, which means for every foot of length, the ground should drop at least 4 to 5 inches. This slope will help prevent water from accumulating around the shelter and ensure it flows away from the structure.
Choosing Drainage-Friendly Materials
For the shelter’s base and drainage system, use materials that allow water to pass through, such as gravel, sand, or a porous tarp. These materials will help to absorb excess water and prevent it from accumulating around the shelter. A tarp or plastic sheeting can also be used to cover the ground and direct water away from the shelter.
Waterproof Roofing and Overhangs
To prevent water from entering the shelter, ensure the roofing material is waterproof and has an overhang of at least 12 inches on all sides. This overhang will help to direct water away from the shelter’s walls and prevent it from seeping in through gaps or openings. Use a tarp or plastic sheeting with a waterproof coating and secure it with rocks or weights to prevent it from shifting in the wind.
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