Depends what you're measuring, flow rate, volume, depth, width, length etc
Probably none because a stream does not have a capacity but a rate of flow.
a waterway is a large stream
A large natural stream, which may be a waterway.
The measure of the largest particles a stream can carry is capacity.
To measure the slope of a stream, you can use the formula: slope = (change in elevation) / (horizontal distance). First, determine the elevation difference between two points along the stream using a level or GPS. Then, measure the horizontal distance between those points on a map or with a measuring tool. The resulting slope will provide a ratio that indicates the steepness of the stream's gradient.
tributary
Litres. (L)
A very large balance
Miles or Kilometers
I would use a large, graduated measuring jug for this.I would use a large, graduated measuring jug for this.
if large,pints if small,ounces if medium,cups
Square metres.