Pictures showing an old river/creek that would pass under Buck's/Comet and Deal Middle School http://archive.is/sOtDg

The old map is from 1913 and you can see where Broad Branch used to be. Maybe someone with better photo editing skills can overlay the images.

Original credit to skippingirl who found it but for some reason it was never picked up.

https://voat.co/v/pizzagate/1458012

https://archive.is/U1RSb

She also posted this article showing urban under ground water ways

Someone helped with the overlay. Thanks Anon!