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How did the Exedra of Herodes Atticus supply drinking water to Olympia?

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Map of southeastern Europe highlighting Greece and marking the location of Olympia with a red star, indicating its status as a World Heritage Site. Olympia is shown in the western part of the Peloponnese peninsula, surrounded by neighboring countries and nearby seas including the Ionian, Aegean, and Mediterranean. — Olympia Olympia was declared a UNESCO World Heritage site in 1989.

The Exedra of Herodes Atticus at Olympia functioned as a large, decorative fountain that stored drinking water for the site. This water was supplied to the structure via an aqueduct that spanned 2 miles (3.2 km) in length.1