systems of trees hold in place soil that, ifwashed away by heavy rains, would flow into streams and rivers, making themshallower and allowing flood waters to overflow protective banks.
(systems of trees; hold; L:in place; soil that, ifwashed away by heavy rains) (soil; ifwashed; away)
systems of trees soil
hold ifwashed
L:in place soil that, ifwashed away by heavy rains
away