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Many modern land drains are created utilising rigid or flexible plastic pipes pierced with holes, laid in pea gravel. (The pea gravel is pea-sized pebbles without sharp points to damage the pipe.) Geotextile material can surround the gravel to keep out silt. This can be installed in an excavated trench.
The Drainage anti-slide pile (DASP) is a reinforced concrete structure with a hollow upper section and a solid lower section, designed to resist slope deformation. [2] [3] The hollow part is filled with compacted, high-permeability gravels and can drain water via a vertical drain-pipe or sub-horizontal pipes connected to the slope surface. [2] [3]
Modern French drain systems are made of perforated pipe, for example weeping tile surrounded by sand or gravel, and geotextile or landscaping textile. Landscaping textiles prevent migration of the drainage material and prevent soil and roots from entering and clogging the pipe. The perforated pipe provides a minor subterranean volume of storage ...
Infill treatment depends on the contained materials: concrete for ponds and reservoirs; gravel for landfill drainage and leachates, vegetated infill for landscape rehabilitation. Concrete work is efficient and controlled as CCS functions as ready-made forms; CCS with concrete forms a flexible slab that accommodates minor subgrade movement and ...
[21]: 147, 149 A flexible fitting may be preferred to connect a shower or heavy tub to the drainage system without transmitting slight movements or stresses, which could eventually cause cracking. [21]: 159 Flexible fittings may also be used to reduce the transmission of vibration into the DWV system.
3 ⁄ 4-14NPSH designates female hose ends that mate a hose to a tapered pipe thread without a spigot. The US standard was defined by NFPA 1963, "Standard for Fire Hose Connections", [ 2 ] then later by ANSI-ASME B1.20.7, [ 3 ] which specifies 1 + 1 ⁄ 16 inches (27 mm) diameter straight (non-tapered) thread with a pitch of 11.5 threads per ...
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