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River Darent: Data

Three examples of typical data collected by students are given below:

Site Number: One
Stream width: 8.4 metres
Stream depth (recorded every metre):
0.18m 0.23m 0.21m 0.20m 0.23m 0.15m 0.16m 0.17m blank blank blank blank
Velocity (recorded a quarter, half-way and three-quarters of the way across the stream):
0.98m/sec
0.83m/sec
0.67m/sec
Bedload size and angularity (sample of six pebbles):
40mm
30mm
20mm
25mm
15mm
32mm
3
5
3
3
4
4
Comments: Natural banks with vegetation, no obstructions in the stream, stream bed very stony all the way across with little evidence of mud or sand.


Site Number: Two
Stream width: 13.6 metres
Stream depth (recorded every metre):
0.31m 0.29m 0.28m 0.23m 0.18m 0.20m 0.18m 0.17m 0.16m 0.22m 0.23m 0.19m
Velocity (recorded a quarter, half-way and three-quarters of the way across the stream):
0.44m/sec
0.42m/sec
0.27m/sec
Bedload size and angularity (sample of six pebbles):
90mm
45mm
40mm
42mm
45mm
36mm
6
3
4
4
4
4
Comments:Artificial banks with some vegetation, no obstructions in the stream, stream bed full of large stones and some pieces of brick.


Site Number: Three
Stream width: 10.2 metres
Stream depth (recorded every metre):
0.25m 0.22m 0.17m 0.20m 0.17m 0.13m 0.09m 0.05m 0.10m 0.32m blank blank
Velocity (recorded a quarter, half-way and three-quarters of the way across the stream):
0.70m/sec
0.54m/sec
0.60m/sec
Bedload size and angularity (sample of six pebbles):
20mm
35mm
40mm
45mm
30mm
26mm
5
3
4
2
5
2
Comments:Some branches fallen into the stream, natural banks with vegetation, just after a meander, bedload of different sizes.



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