Just a drainage ditch... nobody seems concerned(except the neighbors who complained about the road not draining during winter) even here in kalifornia.
A drainage ditch cost us $50K after the EPA got through with us when some silt left a retention pond and ended up in a ditch that drained into a 15" pipe under another contractors equipment yard, EPA claimed it was a "Water Way of the United States". In addition to the "water way" violation we had a "stained" silt fencing violation, not failed silt fencing just stained and an "inadequate" construction entrance.
The inadequate construction entrance fine went like this - the night before the spot inspection by the EPA alongside ADEM (Alabama dept of Enviro management) after it rained several inches and no-one was onsite on a dirt moving site for obvious reasons. Said state vehicle drove onto the muddy site via the construction entrance then went back out across construction entrance to the main road where they stopped to take pictures of
their muddy tires on the asphalt and wrote us up for it. No BS embellishment that's exactly how they wrote it up.
We and the high priced lawyer went to that big federal building in Atlanta to plead our case only to be told by the EPA lawyer that they did not agree with our pleadings/argument/presentation and that's what court is for...
FWIW we put up some cheap Tractor Supply gates on both construction entrances and kept them locked to keep the State and Federal gov't from fining us by violating their own regulations..