CSLB C-27 Landscaping ContractorSite Preparation and DrainageMedium
A landscape contractor is planning a new planting bed on a site with a moderate slope. To prevent soil erosion and create level planting areas, which of the following practices is most appropriate?
- AInstalling a series of terraces
- BApplying a thick layer of sand
- CConstructing a single, large berm at the top of the slope
- DDeep ripping the entire slope
Show answer & explanationAnswer & explanation
Correct answer: A. Installing a series of terraces
Terracing involves creating a series of level or gently sloping steps along a contour, effectively reducing the overall slope length, slowing water runoff, and creating stable planting areas, which is ideal for preventing erosion on moderate slopes.
Why the other options are wrong
- B. Applying a thick layer of sand to a slope generally does not prevent erosion effectively; sand is highly erodible itself.
- C. A single large berm at the top might divert some water but wouldn't create level planting areas or adequately control erosion across the entire slope.
- D. Deep ripping can disturb the soil extensively and may increase erosion on a slope if not followed by immediate stabilization.
Terracing for Slope Erosion Control
Terracing involves creating a series of level or gently sloping platforms along a contour to reduce slope length, slow water runoff, prevent erosion, and create stable planting areas.
- Reduces effective slope length.
- Slows water velocity, minimizing erosion.
- Creates flat areas suitable for planting.
- Requires careful design and construction.
Memory trick: Terraces are like steps for water, slowing its race.