Wetting agents

the area around a well by law to prevent contamination.

well house or wellhead A protective enclosure over a water well.

wellpoint Perforated vertical pipes in the ground for pumping out groundwater in lowering a water table or removing any unwanted water.

well-point system Several wellpoints connected to a main pipe that is attached to a pump. It is often used to temporarily lower a water table in an area, usually so work below the water level can take place without flooding excavations.

welt 1. A seam in sheet metal where two edges are folded together and pressed flat. 2. A strip of wood over a wood seam to increase strength.

west elevation 1. A drawing, usually to scale, showing the west-facing portion of a structure or element as it would be seen standing to the west of it and looking east to view it. 2. The elevation of a portion of ground, paving, or structure situated east of the remainder of it.

western elevation See west elevation.

western exposure 1. A slope that from top to bottom slopes downward toward the west. 2. The west-facing portion of a structure. 3. The area to the west of any nearly vertical surface that has a changed microclimate effected by it with regard to heat or cold, or brightness of sunlight or shadow.

western hemlock A whitish-brown or yellowish-brown, fairly low density softwood used for general construction and plywood.

western larch A reddish-brown, moderately strong, heavy softwood, used in general construction as timbers and flooring.

western red cedar A durable, moderately low density wood, especially for shingles and shakes.

wet-bulb temperature The temperature of a wick that is kept moist.

wet-bulb thermometer The thermometer with a bulb that is kept moist in a psychrometer.

wetland An area that is inundated or saturated by surface or groundwater at a frequency, duration, and depth sufficient to support predominance of emergent plant species (cattails, etc.) adapted to growth in saturated soil conditions.

wetland mitigation Methods of eliminating potential damage or destruction to wetlands, or creation of wetlands from uplands to offset the loss of protected wetlands.

wetland mitigation bank A preserved, restored, constructed, or enhanced wetland that has been set aside to provide compensation for losses of wetland functions caused by human activities as approved by regulatory agencies.

wetland treatment system A wetland that has been designed for reducing concentrations of one or more pollutants in water.

wet rot Decay in timber caused by fungi with a high moisture content.

wet sprinkler system A sprinkler system with its pipes under water pressure, allowing immediate use upon activation.

wettable powder A formulation of pesticide mixed with a finely ground clay to hold the pesticide in suspension when agitated with water.

wetted perimeter The distance of a stream bottom measured from the surface of one side of the stream at a point in time to the surface of the stream on the other side at the same point in time.

wetting agents A chemical in dry or wet form, also known as a surfactant. It assists water in penetrating soil more easily or causing such elements as ground bark or peat moss to absorb water faster. It seems to make water wetter.

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