Hypothesis: We believed that when the water hit the litter, the water will pick up some of the litter and carry it downstream, and then just flow around the stuff to heavy for it to carry.
Test: First we threw a bunch of random stuff on top of the sand/gravel. Then we poured some water on the top of the slope. From there we just observed what happened next.
Observations: The water picked up some trash and flowed around the rest of it.
Conclusion: The water picked up some trash and carried it down the slope. The water picked up mostly paper items and flowed around everything else.
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