FLOODPLAIN MANAGEMENT EXAM 2025 QUESTIONS AND ANSWERS

FLOODPLAIN MANAGEMENT
EXAM 2025 QUESTIONS AND
ANSWERS


Erosion - ....ANSWER ...-wearing away of something


Types of erosion - ....ANSWER ...-Abrasion

Attrition

Corrosion

Hydraulic action




( Audrey Always Calls Her mum)

Abrasion - ....ANSWER ...-Wearing away of bed/bank by load

carried by river




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,Attrition - ....ANSWER ...-Load carried by river wearing

away/pieces break off

Corrosion - ....ANSWER ...-Chemical ions cause rocks to dissolve


Hydraulic Action - ....ANSWER ...-force of air + water making

sides of rivers crack

Factors affecting erosion - ....ANSWER ...-- load (large load=

more erosion)

- velocity/discharge (fast)

- gradient (steep)

- geology (soft rocks)

- pH (more acidic)

- human impact (dams, deforestation)

Erosion Landforms - ....ANSWER ...-- waterfalls

- oxbow lakes




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, Types of Transportation (5) - ....ANSWER ...-- Suspension (small

particles in water flow)

- Saltation (heavy particles bound/bump along bed)

- Solution (dissolved in water)

- Traction (heaviest material dragged/rolled)

- Flotation (surface of the water)

Formation of Oxbow Lakes - ....ANSWER ...-- Result of erosion

+ deposition

- from meanders

- water force is strong around outside bank of meander

- this means banks slowly erode and river breaks through leaving bow

shape of meander open

- in time this shape closes due to deposition and forms oxbow lake

Formation of Waterfall - ....ANSWER ...-- layer of soft rock +

layer of hard rock

- soft rock cut by hydraulic action + abrasion


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