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Geography Rivers


            
             I have found out my hypothesis, "how the river is affected the further downstream it is-. I found that the further downstream the river becomes a lot bigger this is because it is nearer to the sea. The land where the river lays to "further downstream- is flatter this is because the R.Barle starts at pinkery pond which is high up on the moors, the river travels through the high grounds as a stream for example lanaker bridge which is closer to the source of the river it is a stream which becomes a mature river as it reaches towards the R.Exe for example Dulverton then the river is on flatter land closer to sea level.
             The width of the river gets wider the further down stream for example ash pool had a average of 3 meters wide and brushford weir had a massive 7 meters average indicating the river got wider. This is the same cause as it is maturing closer to sea but this does not relate to the depth of the river as I found that the river didn't matter where you were to on the river as I found the river got shallower downstream for e.g. ash pool which was the highest upstream had an average depth of 4 meters, as brushford weir which was the furthest downstream had an average of 2 meters indicating that ash pool was deeper, this is down to factors such as the river is narrower and a sharper edge to the river bank which means a deeper v.shape valley.
             The speed of the river I found got slower the further downstream for example ash pool was a fast flowing section which took the bottle 10 seconds to cross the 10 meter section where as brushford weir took 150 seconds this is probably because the ground at ash pool is steeper and it has a little water fall but at brushford weir the river is very still and calm just before the weir and is wide stretching the current.
             I also found out that the high and low tides do not affect the river Barle much because I found the river didn't change during my testing, this is because the river Barle is a part of a tributary which joins the river Exe so it is not close to the sea.


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