Quick Answer
Livestock need access to 1-2% of their body weight in water per day, typically around 5-10 gallons for a 500-pound cow. A cistern size to meet these needs should be calculated based on the number of animals and their water requirements. Storage capacity should also account for evaporation, leakage, and rainfall.
Calculating Water Needs
To determine the required water storage capacity, calculate the total water needs of your livestock based on their body weight, number of animals, and water requirements. For example, a 500-pound cow needs about 5-10 gallons of water per day. Multiply the total number of animals by their daily water needs to get the total daily water requirement. For a 10-head cattle herd, the daily water requirement would be 50-100 gallons.
Cistern Sizing Considerations
When sizing a cistern for livestock water storage, consider the following factors: evaporation (0.2-0.5 gallons per day per square foot), leakage (0.5-1 gallon per day per foot of pipe), and rainfall (assuming 1-2 inches of rainfall per month). A general rule of thumb for cistern sizing is to provide 2-4 months of water storage capacity for livestock.
Storage Capacity Examples
For a small farm with 10 head of cattle, a cistern with a storage capacity of 10,000-20,000 gallons would be sufficient to meet their water needs for 2-4 months. For a larger farm with 50 head of cattle, a cistern with a storage capacity of 50,000-100,000 gallons would be required. These numbers assume an average water requirement of 5-10 gallons per cow per day.
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