Catskill water access-hole covers

You're familiar, perhaps, with "farm to table."

Here, you might say, are two signs of a "lake to table" movement that were set in place nearly a century ago to ensure a steady supply of Catskill water for the city. The jocular-sounding engineering jargon (below) is a bonus.

"Catskill water by-pass" and "Catskill water blowoff"
Access-hole covers (detail) on Dekalb Ave. near Cumberland St., Fort Greene, Brooklyn