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A comparison of two rivers in the Brecon Beacons National Park.

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G.C.S.E. Geography Coursework. Chapter 1: Introduction. This is my G.C.S.E. coursework project. It is a comparison of two rivers in the Brecon Beacons National Park. The first river measured was near the source (Cwm Haffes) whilst the second was further downstream (Craig-y-nos). See maps. Before I measured anything I thought that the following would happen as the water flowed downstream: - 1. The river would get wider because more water was being added from other sources, (the amount of water multiplying each time a new tributary joins the main river). 2. The river would also become deeper, again, because there is more water flowing through the river. 3. The river speed will increase because more water will provide more of a force against the lands resistance. 4. The river gradient could increase because it is coming out if the mountains but I'm not really sure about this idea at present. I then went to collect my data to find out whether my predictions are correct or incorrect. Chapter 2: Method. During our day out in the Brecon Beacons (11th July, 2006), the class split up into groups and went off to measure two different rivers. ...read more.


I thought this was very reliable because it was easy and simple to read. Depth. To measure the depth, we divided the width into four equal sections. We did this so that the depth would be spread out and taken in unbiased locations. We then took a metre ruler and placed it side on to the tape measure. We did this side on so that the water from the river does not rise, if it rises it could affect the accuracy of the result. We then ensured that the bottom of the ruler was flat on the bottom of the river. Then, we read off the number where the river surface marked the ruler. I think that this is not very reiable because of stones or rocks placed at the bottom of the river. However, is this method reliable for different sized rivers? The reliability for small rivers is higher than the reliability for larger rivers. This is because the gaps in smaller rivers have smaller distances then the gaps in bigger rivers. ...read more.


My group and I did not use this technique. However, I assume that if we did use this technique, then we would have found some faults. I assume that these faults would include: * An object getting in the way, * If there was a current then it might carry the object we are using in another direction therefore resulting in inaccurate results. Gradient. Finally, we measured the gradient. To do this we kept 10m of tape measure along the riverbank, and then used a clinometre. One person from the group went down to the far end of the 10m. Next I put the clinometre to my eye and looked into the other person's eye. I then waited for the wheel on the clinometre to stop spinning and then read off the number that it stopped on. I think this is not very reliable because you need two persons of the same height at either end of the 10m otherwise the result can be effected. After we ad measured the first river, my group and I then went to Cwm Haffes and repeated the same techniques. We measured both rivers on the same day so that we could fairly compare our results to allow us to complete our coursework. ...read more.

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