Patrick Kielty's journey to find the truth about William Mulholland, the man who provided water for Los Angeles. Patrick's family are water men - from his great-grandfather to his father, they all worked for the water company in Northern Ireland. Water runs in his veins, along with gin on a Sunday night. Nowadays his second home is Los Angeles, so he was surprised to discover that the man who gave LA its water, and hence made the city we know today possible, was from Belfast. That man was William Mulholland, and this is Patrick's journey to find out why no-one has really heard of him.