Washington State Department of Ecology

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Techniques

General Compatibility of Drainage Control
Techniques in Different Areas of a Slope

Compatibility

Drainage Goals:

Slope Crest
Modifications

Slope Face
Modifications

Slope Toe
Modifications

Increases Slope Stability: Less water in/on slope
Decreases Slope Erosion
Environment Impact: Potential improvement in water quality
Environment Impact: Potential degradation in water quality
Environment Impact: Significant ground surface disturbance
Relative low-cost construction
Relative low-impact construction
Reduces slope toe undercutting by waves

Drainage Systems:

Slope Crest
Modifications

Slope Face
Modifications

Slope Toe
Modifications

Teaching Systems: Installation with heavy equipment
Relief Drains: Groundwater control
Strip Drains: Seepage control
Swales and Tightlines: Surface and ground water control
Contour Wattling: Surface water control
Revegetation: Surface water control
Drainage Source Control: Avoidance of flow concentrations
Additional Drainage Control Techniques

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