Page 8 - Water Pollution Management - Silty Water - Environmental Impact
P. 8
Factors affecting erosion
Slope
The steeper the slope the faster the water will run-off, giving less time for it
to soak into the ground
Soil
The more permeable the ground the greater the percentage of the storm
water that will soak in, reducing volumes available to run-off. Fine grained
soils (fine silts and clays) have poor settling characteristics, making them
more difficult to recover.
Vegetation
Helps slow water velocities, encouraging it to soak into the ground and
bind the soil together. Erosion rates are greater on exposed (bare soil) Erosion = exposed soil X overland flow of water
Annual rainfall
The greater the rainfall the greater the amount of run-off which will be
generated
Drainage Area
The greater the area drained, the larger the volume of water which will
be generated.
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