What is depicted in the photograph below? Explain how the use of this system helps conserve water. 
Definitions:
Laws of Expected Value
Mathematical rules that describe the properties of the expected value, highlighting how it behaves with respect to various operations like addition and multiplication.
Probability Distribution
A mathematical description of the likelihood of various outcomes from a random process.
Number of Horses
The total count of horses in a given scenario or study, often used in statistical analysis related to equine studies.
Probability Distribution
A function that describes the likelihood of obtaining the possible values that a random variable can assume.
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