I work at the Monterey Business Center in Yucca Valley, California, which is about 250,000 square feet of flat roofs and cement parking lot. I’d been wondering what all that would look like in a rain event and on August 29, 2013 I found out.

Monterey Business Center arial from Google Maps

Monterey Business Center arial from Google Maps

Jackie is not as excited about the rain as I am.

Roof water pours onto the sidewalk and into the parking lot

The parking lots have channels to direct water to the street

Onto the street

Down the street

Off the end of the street

Into a gully. (The blue-topped pipe in the gully says “water” on it. I thought that was hilarious.)

Down the gully

Flash flood in Yucca Valley on Make A Gif

And through the desert

pkvKsi on Make A Gif, Animated Gifs

Until it hits the berm of a road

Until it breaks through onto the road

And starts to flow down the road

This is where it ran out of steam. The water puddled up here and then mostly evaporated, “To rain again on someone else, east of us,” as Buck from Transition JT says. If there had been more water, it would have poured down this road and into a slightly more intentional gully at the end of it:

It would eventually hit the big wash in front of those mountains in the distance and flow east to the dry lake bed that is just west of Copper Mountain, maybe 18 miles away. That’s the lowest point in our watershed.

dry lake

Copper Mountain, Sunfair lake bed in front.

[animated gifs made at MakeAGif]
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