Drainage Area


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Related to Drainage Area: drainage basin

drainage area

[′drān·ij ‚er·ē·ə]
(hydrology)

Drainage Area

 

(also hydrographical basin), a land surface, bounded by a divide, whose discharge goes into a basin. The structure of the drainage area (terrain, the presence of lakes and swamps, and the type of vegetation) considerably influences the discharge of water. The nature of the terrain of a drainage area determines the hydraulic gradient and the density of the river and valley network—that is, the speed of runoff on slopes and the rate of water flow in channels. The presence of various closed depressions causes some surface water to be held in these depressions, to be lost to evaporation and seepage, and to begin to flow into a channel only after it has filled the depressions.

drainage area

An area having a drainage channel beneath the surface.
References in periodicals archive ?
As stated by Costa (1987), the number of flood events greatly reduces as a function of drainage area A and drainage density [D.
An ordinance provides policies for drainage district, coordinated drainage areas, drainage projects, and drainage basin utility districts.
Our hypothesis is that estimates of the slope as well as drainage area are influenced by resolution, especially on relatively flat ground, like a peat land.
Explanatory variables included in the procedure were feedlot drainage area (ha), vegetative filter strip:drainage area ratio, vegetative filter strip age (years), vegetative filter strip slope (%), total annual (1998) rainfall depth at each site (mm), total site rainfall depth over study period (mm), event rainfall depth (mm), and estimated vegetative filter strip inflow volume ([m.
We described the landscape position of each sampling site using size of the drainage basin above the sampling site (henceforth referred to as drainage area); increasing drainage area indicates a movement from headwaters to downstream reaches.
The stream and a nearby watershed - water drainage area - could be poisoned if a radiation leak ever occurred.
When gradients steepen, a river can expand and capture a larger drainage area.
In the evaluated area, vertical wells -- all completed (perforated and stimulated) in a variety of ways -- averaged ultimate recoveries of 20-30,000 bbls of oil, which translates to a drainage area of 15 acres or less.
The pilot project is part of a larger project aimed at reducing dissolved minerals like salt and selenium in the Grassland Drainage Area.
A team of approximately 15 Lane County Search and Rescue volunteers along with sheriff's office staff hiked down about 2,000 feet into a drainage area where Gray was located and pronounced dead.
to dig 46 linear trial trenches in the ridge and furrow fields/ Dugdale drainage area adjacent to the church from May 31 onwards.
The main issue with that site is that it's part of a large water drainage area for that section of the city,'' Deputy Superintendent Lori Ordway-Peck said.