Seeing that pic of the reservoir reminded me of something I saw on TV last week... might have been on Modern Marvels.
There was a segment on the underground reservoir that is being put in up in the NW corner of Griffith Park... I was amazed... an underground reservoir is a totally foreign concept to me.
A KABC news segment I just found:
Reservoir construction frustrates residents | abc7.com
It's only relevant here because I think I remember reading here that most of the racing scenes in "King of the Mountain" were filmed in Griffith Park.