How to ensure proper drainage in a snow cave sleeping area?

Snow Cave Drainage Basics

When building a snow cave, it’s essential to consider the natural water flow and drainage patterns of the surrounding area. Ideally, the entrance of the cave should be situated on a slight incline or at the highest point of the snowbank, allowing water to flow away from the cave. If the entrance is not naturally on an incline, create a slight gradient using snow blocks or by digging a shallow trench.

Creating a Drainage Trench

To create a drainage trench, dig a shallow channel (about 6-12 inches deep and 2-3 feet wide) along the perimeter of the cave, starting from the entrance and working your way around the sleeping area. This trench should be positioned to direct water away from the cave. Use a shovel or a snow saw to remove snow and create a smooth, even surface.

Snow Sump and Inclined Sleeping Area

If a drainage trench is not feasible, create a snow sump by digging a small pit (about 2-3 feet deep and 1-2 feet wide) near the entrance of the cave. This sump will collect and redirect water away from the sleeping area. To ensure proper drainage, create a slight incline in the sleeping area by digging one side of the cave slightly lower than the other. This will allow water to flow away from the sleeping area and towards the sump.