The survival Principle of Three states that in extreme weather, you have about three hours to find shelter; that does not mean you drop dead in three hours, but it means your chances for survival start diminishing exponentially.
Building this type of shelter ensures you will stay relatively dry while being able to trap body heat, which helps increase your chances.
Survival in wet weather is never a picnic and always fraught with negative consequences.
The longer you are exposed, the more likely it is that your body heat diminishes to a dangerously low point, which begins a slow slide to death if not averted or addressed.
How would you improve upon this shelter? Let us know below.