In retrospect, it should have been obvious . . .
Flash floods can happen here!

This photo was taken by an Asahi Pentax 6 X 7 medium format film camera and Super-Takumar/6X7 1:2.4/105mm lens with a Zenza Bronica 67mm SO56•2C(YA3) filter using Ilford HP5 Plus 400 film, the negative scanned by an Epson Perfection V600 and digitally rendered with Photoshop.