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Questions and Answers
What is the inclination of the base's upstream face?
What is the inclination of the base's upstream face?
How far should the wings enter into the sides of the bed?
How far should the wings enter into the sides of the bed?
What is the minimum diameter of each drainage hole?
What is the minimum diameter of each drainage hole?
What is the gradient of the aqueduct and drainage holes?
What is the gradient of the aqueduct and drainage holes?
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What is the inclination of the downstream face of the dam?
What is the inclination of the downstream face of the dam?
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What is the purpose of the wing walls?
What is the purpose of the wing walls?
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What is the angle between the wing and wing wall?
What is the angle between the wing and wing wall?
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What type of masonry work is used for the counter-dam?
What type of masonry work is used for the counter-dam?
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What should the stones used in constructing masonry check dams be?
What should the stones used in constructing masonry check dams be?
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What is the purpose of filling the space behind the dam?
What is the purpose of filling the space behind the dam?
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Study Notes
Design of a Check Dam (PAES 614:2016)
- Specifies the minimum design requirements and procedures for a check dam for streamflow and/or runoff harvesting.
Definitions
- Check dam: a small barrier built across the direction of water flow on shallow rivers and streams to convey runoff during peak flow and slow and hold surface water long enough for sediment to deposit.
- Gabion: stones wrapped in wire fence meshes for added stability and strength.
Classification of Check Dams
- Classified based on the type of material used for construction:
- Brushwood Check Dam
- Log Check Dam
- Loose Stone Check Dam
- Boulder Check Dam
- Masonry Check Dam
- Gabion Check Dam
Site Selection
- The length of the river or stream should be sufficient with adequate volume of stored water.
- A drainage system should exist for effective water blocking.
- The site should be accessible for construction, operation, and maintenance.
Design Procedure
- Estimate maximum discharge (Q) using flood discharge analysis.
- Calculate spillway dimensions: Q = CLD3/2, where C = coefficient, L = length of spillway, and D = depth of spillway.
- Check the stability of the check dam.
Gabion Check Dam
- If the total height of the gabion check dam is < 3 m, use box gabions of specific dimensions.
- If the total height of the gabion check dam is 3 m to 5 m, use the formula: k = 0.4H, d = 0.6H, and f = 0.3H, where k = thickness of the dam's crest, d = thickness of the dam's base, and f = depth of foundation.
- Stones should be hard, non-disintegrating, and resistant to weathering, and packed inside the boxes.
- Use specific procedures for placing ties, lids, and constructing the dam.
Masonry Check Dam
- The stones used should be hard, non-disintegrating, and resistant to weathering.
- A counter-dam should be constructed in front of the first masonry check dam.
- The construction of wing walls should be dry rock work.
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Description
Test your knowledge on the design requirements and procedures for a check dam, as specified in the Philippine Agricultural Engineering Standard PAES 614:2016. Learn about the purpose and definitions of check dams, and more!
