GeoResources - Geography website: River Darent


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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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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.