Cold hard $$ down drain in B’klyn

Thirsty Park Slope residents are paying a pretty penny for freeze-resistant water fountains in Prospect Park.

Locals voted to spend $175,000 on five drinking fountains that will flow whether or not the mercury dips — even though meteorologists say such days are few and far between.

Brooklyn City Councilman Brad Lander included the fountains in his 2016 participatory budgeting, which lets residents decide how to allocate $1 million among various projects.

Lander and Prospect Park Alli- ance President Sue Donoghue (both at right) took bows during a Thanksgiving Day activation of the first “frost resistant” drinking fountains — but some gave the sipping spots an icy reception.

“It’s disgraceful and wasteful,” fumed state Conservative Party Chairman Mike Long. “They don’t care how they spend people’s money.”

Carol Brooks, of nearby Carroll Gardens, slammed the fountains in online comments, calling them “an outrageous and ridiculous expenditure.”

Lander defended the $35,000- apiece fountains, whose waterlines are buried deep enough to avoid icing over in winter.

“People who use the park in the winter — for exercise, for their kids to play, for fresh air, for mental health — definitely believe these five new freezeresistant drinking fountains are worth $175,000 of their shared tax funds,” he said.

There were 12 days in 2016 when the temperature was at or below freezing and 18 such days in 2017, according to the National Weather Service.