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Harmonica Type Horizontal Drain
FromSpe Industry
HHDR(Harmonica type horizontal drain) is a fully filtered, prefabricated subsoil drainage system widelyused around world. It consists of aplastic inner Harmonica core overwrapped withageotextiles filter fabric. HHDR isplacedunder the surcharge to receive the flow fromthe vertical drains and conduct it laterally to discharge points at the edge of the surcharge. In most cases the installation of HHDR is less expensive than a aggregate or sanddrainageblanket.
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- Substitution for Sand Mat
- Pore water drainage of banking
- Spring pore water drainage from existing ground.
- Rain water drainage from ground surface.
- Use as Horizontal Drain on Slopes.
- Drainage of Retaining Walls
1.Low cost
- Installation and material cost is half than gravel or sands
- Easy to store and transport.
2.High Drainage efficiency
- Structure of core provides multiple channels for vertical and horizontal water flow.
- Filter fabric permits high volume entry of water into core while restraining soil particles.
3.Workability
- Lightweight, flexibility easy-to-handle
- No heavy equipments or skilled laborers are required.
4.Confidence
- Uniform properties and quality assure predictable drain performance.