The easiest way to do it (without getting your feet wet) is go to the edge of the stream where it is fairly straight, find a spot directly across from your location and mark it in you mind, Pace along your side of the stream looking back, until the marked spot is 45 degrees back from your line of travel. The stream is the same width as the distance you have walked from your starting point.
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appropriate unit to measure the width of a textbook = ce ntimeters
with a tape measure. the CSA
A tape measure
length times width length times width
METERS!!!The unit of measurement you would use to measure the width of your classroom is meters.