Map Reading Exercise on River Basin

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Presentation transcript:

Map Reading Exercise on River Basin

Find the average gradient of the river.

Gradient= Height difference / Total length Height difference=? (600-0)m Total length = ? 21cm Scale = 1:50,000 1cm = 50,000cm = 500m (21X500)m=10,500m

differences in fluvial processes between X and Y.

differences in fluvial processes between X and Y. There is more erosion in X than Y. The main fluvial process at X is erosion but at Y is deposition. There is mainly vertical erosion at X but lateral erosion at Y. There are more transportation and deposition at Y than at X.

difference in average velocity between X and Y The velocity at X is low. The average velocity at X is lower than Y Because the discharge at X is smaller than Y. The roughness at X is greater than Y. The friction at X is higher than Y. More energy at X is used to overcome the roughness.

Hydrograph after hillfire Time Discharge(m3/s)

The living of the farmers My living is affected. The production is affected. My fields/farm and house will be drowned. There will be crop failure because there is not enough water for irrigation. The crop production will drop. There will be loss of life and properties.

83 Scale 1:20,000

3 Sections of a River 224834 to 220830 220830 to 215826 Grid Reference Gradient River Course 224834 to 220830 220830 to 215826 215826 to 208825 Upper course middelecourse Lower course 1 in 2.26 1 in 5.91 1 in 60