HORIZONTAL WELLS
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HORIZONTAL WELLS
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HORIZONTAL PIPES
• On sloping ground surfaces small-diameter horizontal holes can be drilled by the rotary method .perforated pipes placed in these holes tap groundwater that would otherwise be discharged by seepage or from small spring. Two examples are shown in fig:. Such horizontal pipes provide sanitary and low cost water, and in addition, enable flow to be controlled by valves at the discharge ends. The same technique has also been widely employed to drain side slopes, such as in highway cuts, in order to reduce the possibility of landslides.
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INFILTRATION GALLERIES
• Infiltration galleries may be used to supplement a storm sewer, by directing storm runoff from non-road areas.
• While the catchbasins under sewer grates work well on swift-flowing surfaces like asphalt and concrete, heavy storm water flow on grass lawns or other open areas will pool in low areas if there is no outlet. An infiltration gallery serves this purpose in two ways.
• Primarily, upright plastic pipes capped with simple grates are placed every 5-8 metres along the low point of a slope, to handle heavy surface runoff. The pipes proceed straight down, about two metres, to a horizontal cross-pipe; this pipe is the secondary system.
• The horizontal pipe is then perforated slightly (about 10% of its surface area) and surrounded by gravel. Initially, runoff will exit the pipe and infiltrate the gravel to the soil beyond, dissipating naturally. As flow increases, the water will eventually fill the pipe and need to be dissipated more quickly. Thus, a catchbasin is placed at the lowest point of the sloping ground, which is connected to the storm sewer system at large.
• Such galleries are a relatively new development in urban planning, and are thus found in newer housing developments.[1]
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COLLECTOR WELLS
RANNEY® COLLECTOR WELLS How to maximize yields from your groundwater supply
As an alternative to conventional vertical wells, Layne Christensen Company also constructs radial collector wells through its Ranney Collector Wells group. These wells are generally comprised of a vertical reinforced concrete shaft with horizontal lateral well screens projected out into the aquifer to collect and filter the groundwater.
Typically installed in alluvial aquifers close to a dependable surface water source, these wells take advantage of a natural filtering process referred to as Riverbank Filtration (RBF). This natural filtration can simplify treatment and ensure the owner of high quality and high capacity water production.
The RBF collector well installed for the Louisville Water Company is typical of these applications, developing a reliable supply of over 15 million gallons per day of naturally filtered river water (pictured at right).
Ranney Collector Wells can also be used for developing moderate to high capacity groundwater supplies. We also construct infiltration galleries and surface water intakes at sites nationwide and overseas.
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