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A gully in Kharkiv oblast, Ukraine. Gullied landscape in Somalia.. A gully is a landform created by running water, mass movement, or commonly a combination of both eroding sharply into soil or other relatively erodible material, typically on a hillside or in river floodplains or terraces.
These models have addressed both gully and sheet erosion. Earliest models were a simple set of linked equations which could be employed by manual calculation. By the 1970s the models had expanded to complex computer models addressing nonpoint source pollution with thousands of lines of computer code. [ 5 ]
Also, there are check dams that are constructed with rockfill or wooden boards. These dams are usually implemented only in small, open channels that drain 10 acres (0.04 km 2) or less; and usually do not exceed 2 ft (0.61 m) high. [16] Woven wire can be used to construct check dams in order to hold fine material in a gully.
A sewer pipe is normally at neutral air pressure compared to the surrounding atmosphere.When a column of waste water flows through a pipe, it compresses air ahead of it in the system, creating a positive pressure that must be released so it does not push back on the waste stream and downstream traps, slow drainage, and induce potential clogs.
Source areas and the hillslope areas associated with channels are differentiated by source areas draining through the channel head, while the associated hillslope areas drain into the rest of the stream. [3] According to Strahler’s stream ordering system, all source areas drain into a primary channel, by the definition of a primary channel. [4]
the design drain spacing (L) can be found from the equation in dependence of the drain depth (Dd) and drain radius (r). Drainage criteria One would not want the water table to be too shallow to avoid crop yield depression nor too deep to avoid drought conditions. This is a subject of drainage research.
Cross Sectional Diagram of a Two Stage Drainage Ditch . A drainage ditch is a depression in the land created to channel water.Drainage ditches are typically formed around low-lying areas, roadsides or fields proximate to a water body or created to channel water from a more distant water source for the purpose of plant irrigation.
The drain was commented on by the geologist Laurence Cussen in 1893 as the outflow had recently eroded a gully 70 ft deep where it flowed into the Waikato river. [8] During the time the drain was being dug the settlers came into conflict with local Māori when they attempted to drain land south of the Aukati or confiscation line, [ 9 ] a farm ...