 The result is a stream system in which streams consist mainly of straight line segments with right angle bends and tributaries join larger streams at right angles.
<fluency>  The result is a stream system in which streams consist mainly of straight line segments with right angle bends and tributaries join larger streams at right angles.
 The result is a stream system in which streams consist mainly of straight line segments with right-angle bends and tributaries join larger streams at right angles.