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# Methodology the best way to find a rivers velocity is to calculate the average speed of the stream. But the question still remains, where can I measure the average velocity of the river?

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Introduction

Methodology River Discharge: The amount of water flowing in a stream is called its discharge, which is the volume of water moving in a stream during a given time interval, usually seconds. River discharge = cross-sectional area x velocity of the river. The cross-sectional area = width of the stream x mean depth. This means, to calculate river discharge, we need to calculate the channel depth and width which leads to the cross sectional area; and channel velocity. Firstly am going to calculate river velocity. Average Velocity (speed): River velocity differs in different parts of the river. Due to the friction of the roughness of the bed material, the flow of the water is slowest at the bottom and fastest at the top. ...read more.

Middle

Then we will drop float in the river and count how long it will take to get the whole ten meters using a stopwatch. However we have to repeat this process three times: the left side of the river, middle and right side of the river. The reason for this is so that we have the average speed as the current flows swiftly on the outside of a river, where it goes. Load particle size: To find the load particle size of a river, in the first place, we had to collect a reasonable amount of load from the river bed and measure each stone from the longest side for a fair examination. Channel Width: The channel width will increase as you move down stream. ...read more.

Conclusion

Some pebbles may be too small to measure. As you pick up twelve pebbles try and pick up larger than smaller pebbles for easier measurements. Powers Index of Roundness and Sphericity: The length of pebbles will increase as you move down stream; the roundness of the pebbles will increase as you move down stream. Picked ten random pebbles out of the river, measured the roundness of them in miller meters. Some pebbles may be too small to measure the roundness or some may have ridged or sharp edges. Pick up several large pebbles that are fairly round with no sharp ends. Discharge- is the amount of water you have, and how much of it will pass through a certain point. I presume will decrease due to less water availability downstream. Hydraulic Radius- will become more efficient due to less water touching the banks as well as the depth increasing as the two are linked. ...read more.

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