Drip line (rainfly)
Overview
The drip line of a rainfly is the outer edge where water naturally runs off and falls to the ground. Its position influences how well a tent or shelter protects against rain and splashback.
Key points
- Marks where water leaves the fly fabric under typical conditions.
- Ideally falls a sufficient distance away from the inner tent or sleeping area.
- Pitching angle and tension can change the effective drip line.
- Ground conditions and distance from the drip line affect splashback.
- Understanding the drip line helps with site selection and shelter setup.
Details
When rain hits a tent rainfly or tarp, water flows downward along the fabric and eventually drips off at the edge. The line along which this occurs is known as the drip line. For effective weather protection, the drip line often fall far enough outside the sleeping area that water does not run under or onto the inner tent or sleeper.
Shelter design and pitching technique both influence the drip line. Steeper pitches often bring the drip line closer to the ground and nearer to the base of the shelter, while shallower angles can move it outward. Adequate tension reduces sagging, which might otherwise cause water to drip in unwanted locations.
Ground conditions around the drip line matter as well. Hard surfaces, rock, or compacted soil may promote splashback, where raindrops hitting the ground bounce onto lower parts of the shelter or inner tent. Some hikers place gear or use slightly wider pitches to moderate this effect.
By paying attention to where the drip line falls during setup, hikers can improve overall rain protection and reduce incidental moisture reaching sleeping gear.
Related topics
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