- Students will be able to calculate annual water needs for the Lab.
Teach the Teacher
Tools & Materials
- Scratch pad and pencil for each student to make calculations
One of the challenges in using rainfall as the Lab’s water supply is that the frequency of the rain is not sufficient to meet the demands given the storage potential of the rain harvesting system.
In Buffalo, we have a 214-gallon system. Assuming we used that much each month, the ideal situation would be a rainfall sufficient to fill our system every 30 days. We might run low but never run out.
Mother Nature doesn’t work that way so there is a need to store excess capacity to serve the needs of the Lab systems when the rains just don’t come.
Calculate the water needs for the Lab for the entire year. Working with your system’s collection potential determine the amount of rainfall needed to yield enough for your demand.
What would be the perfect frequency for an average rainfall to keep your system charged and meet demands? Consider the monthly average rainfall and calculate the storage capacity you would need to meet the demand when rainfall is not sufficient to meet your needs.
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