culvert

"After the heavy rain, the river was flooding the nearby town. "

"The plants in the garden needed rainwater because it hadn't rained for a week. "

"The dry-stone wall used a large, flat through to support the top stones. "

"Walk down the street until you see a hotel on the right."

"I brush my teeth regularly to prevent them from turning yellow."

"The railway allows people to travel quickly between cities. "

"The water coming out of the waterwheel created a standing wave in the channel."

"Rivers flow from springs and lakes."

"The fallen tree lay as a dangerous transverse across the road, blocking all traffic. "

"Construction is underway on the new bridge."

"The stream ran alongside the school playground. "

"The clogged sink drained slowly."