Drainage - Drainage Contractors
Napa Valley, Napa, County, San Francisco North Bay, Ca. USA

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Drainage is the natural or artificial removal of surface and sub-surface

water from a given area. Many agricultural soils need drainage to improve production or to manage water supplies.

Modern drainage systems incorporate geotextile filters that retain and prevent fine grains of soil from passing into and clogging the drain. Geotextiles are synthetic textile fabrics specially manufactured for civil and environmental engineering applications. Geotextiles are designed to retain fine soil particles while allowing water to pass through. In a typical drainage system they would be laid along a trench which would then be filled with coarse granular material: gravel, sea shells, stone or rock. The geotextile is then folded over the top of the stone and the trench is then covered by soil. Groundwater seeps through the geotextile and flows within the stone to an outfall. In high groundwater conditions a perforated plastic (PVC or PE) pipe is laid along the base of the drain to increase the volume of water transported in the drain.

 

 

 

 

 

 

 

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Alphabetical Listings

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Dixon's Backhoe & Engineering
1950 Twin Creeks Ct, Napa, CA 707 257-2016

Forster Pump & Engineering Inc 
56 Woodland Ave, San Rafael, CA 415 459-4770

Morrison Construction
7325 Silverado Trl, Napa, CA 707 944-0307

 
 
  Alternatively prefabricated plastic drainage systems, often incorporating geotextile, coco fiber or rag filters can be considered. The use of these materials has become increasingly more common due to their ease of use which eliminates the need for transporting and laying stone drainage aggregate which is invariably more expensive than a synthetic drain.

Over the past 30 years geotextile and PVC filters have become the most commonly used soil filter media. They are cheap to produce and easy to lay, with factory controlled properties that ensure long term filtration performance even in fine silty soil conditions..


Drainage in Construction
The civil engineer or site engineer is responsible for drainage in construction projects. They set out from the plans all the roads, drainage, culverts and sewers involved in construction operations. During the construction of the work on site he/she will set out all the necessary levels for each of the previously mentioned factors.

Site engineers work alongside architects and construction managers, supervisors, planners, quantity surveyors, the general workforce, as well as subcontractors.
 
 
 
 
 

 

 
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