Quick Answer
Sizing a cistern for vegetable gardening requires calculating the water needs of your garden, considering factors like climate, soil type, and crop selection. You'll also need to determine the cistern's capacity, taking into account space constraints and local regulations. A general rule of thumb is to size the cistern to hold at least 10,000 gallons of water per acre of garden.
Determining Water Needs
To size your cistern, start by calculating the water needs of your garden. A good rule of thumb is to assume 1-2 inches of rainfall per week, which translates to 0.04-0.08 inches of water per day. For a 1,000 square foot garden, this means 12,000-24,000 gallons of water per year. Consider the water requirements of specific crops: tomatoes, for example, need about 20 gallons of water per week, while lettuce needs about 1 gallon per week.
Calculating Cistern Capacity
Next, calculate the cistern’s capacity based on the water needs of your garden. A general rule of thumb is to size the cistern to hold at least 10,000 gallons of water per acre of garden. For a 1,000 square foot garden, this means a cistern with a capacity of at least 10,000 gallons. However, if you live in a dry climate or have a large garden, you may need to size the cistern for more water storage. Consider factors like evaporation rates, infiltration rates, and potential water loss due to leaks or overflows.
Cistern Sizing Considerations
When sizing your cistern, also consider space constraints and local regulations. Cisterns can be installed above or below ground, and their size will depend on available space and local building codes. Make sure to check with your local authorities for specific regulations regarding cistern size, material, and installation. Additionally, consider factors like access, maintenance, and potential water quality issues when designing and installing your cistern.
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