Aku was born in Plateau State and qualified as a water engineer.
"I'm not a water engineer," he told a reporter.
The Hospital's water engineer, Charles Swainson, is the head of the project.
"They did the evaluation in 1994," said Joseph Marcogliese, regional water engineer for the department.
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He was working as a water engineer in Afghanistan and travelling with local colleagues when their car was stopped by unknown armed men.
No plans of its construction survive, although one of the locks was documented by a visiting water engineer in 1699.
He retired in 1896 but continued to work as a water engineer.
A spokesman said: 'Our water engineer's prayers have been answered.
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