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HHD

Horizontal drain

HHD100, HHD200, HHD300, HHDR100, HHDR200, HHDR300

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Introduction


HHD(Harmonica type horizontal drain) is a fully filtered, prefabricated subsoil drainage system widely used around world. It consists of a plastic inner Harmonica core overwrapped withageotextiles filter fabric. HHD is placed under the surcharge to receive the flow from the 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 sand drainageblanket.




Shape and type





Comparison of horizontal drainage method






Benefit


Low cost

- Installation and material cost is half than gravel or sands

- Easy to store and transport.


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.


Workability

- Lightweight, flexibility easy-to-handle

- No heavy equipments or skilled laborers are required.


Confidence

- Uniform properties and quality assure predictable drain performance.




Application








Substitution for sand mat



The improvement of soft ground

Road construction

Sand mat                                                                               HHD



Road construction

Ditch

Filter, Crush stone, High pressure, Perforated pipe

Collecting well




Method of installation




Horizontal drain
Vertical drain
PCD
S-PBD / Biodegradable PBD
Vacuum consolidation