Household water reserve
Estimate a chosen water reserve with a contingency allowance.
How it is calculated
Base = people × days × daily allowance. Total = base × (1 + contingency ÷ 100).
Assumptions & limits
Choose the allowance for your climate, activity and intended uses. This does not establish drinking-water quality or treatment needs. Defaults are illustrative planning inputs, not recommended minimums or a guarantee of safety.
Planning estimates only. Defaults are illustrative, not personalized recommendations. Do not use these calculations as medical, structural, electrical installation or other safety certification. For informational and educational purposes only. CivArk is not medical, legal, engineering or other professional advice. Verify information with qualified professionals and current local authorities. Estimates and preparedness plans cannot guarantee safety or survival.