If your pool is located on or near sloping ground, it may have natural drainage which is certainly more desirable than to be faced with the annual expense and labor of first pumping out the water and then scooping out all the debris.

The site has a 90, 000-square foot heated indoor practice facility, Three outdoor NFL natural turf football fields that feature an immediate gravity drainage system, and a complete kitchen and dining facilities for team meals.

This elevated region has a natural drainage pattern that rarely functions because of insufficient rainfall.

Much money has been spent for land amelioration projects involving the installation of drainage pipes, the straightening and deepening of natural streams, the digging of drainage ditches, and the construction of polder dams.

The National Research Council divides Thailand into six geographical regions, based on natural features including landforms and drainage, as well as human cultural patterns.

Irrigation is often studied together with drainage, which is the natural or artificial removal of surface and sub-surface water from a given area.

In the fields of physical geography, ecology, biogeography, zoogeography, and environmental geography, regions tend to be based on natural features such as ecosystems or biotopes, biomes, drainage basins, natural regions, mountain ranges, soil types.

The amount, location, and timing of water reaching a drainage channel from natural precipitation and controlled or uncontrolled reservoir releases determines the flow at downstream locations.

The southern part of the county has better natural drainage, and this area was first cleared for agriculture.

Much of the rest of the county tended to be swampy due to the level ground and lack of sufficient natural waterways, so drainage channels had to be dug to make the land suitable for farming.

Because Champaign County is situated on a large and very flat plateau, it had virtually no natural drainage, so that much of the County consisted of wetlands until drainage ditches were built, beginning in the 1870s.

The ice sheet closed the natural drainage from the Vale of Pickering, the Humber and The Wash so that a lake of a complex shape formed in the Vale of Pickering, the Yorkshire Ouse valley, the lower Trent valley and the Fenland basin.

:” It is likely that natural contamination adversely affected water quality and fish habitat in the Alamosa River long before and will continue to have adverse effects even when acid drainage from Summitville is remediated.

The river provided water supply, power, and drainage and it bequeathed a natural beauty as it flowed at the base of hills that marched away on either side.

Other significant waterways in the city are Isaac Verot Coulee, Coulee Mine, Coulee des Poches and Coulee Ile des Cannes, which are natural drainage canals that lead to the Vermilion River.

Developers created a modern system of canals for drainage purposes and irrigation as early as 1901, but it interfered with the natural processes of the wetlands.

They are called wetering (" drainage waterway ") and are amalgamations of natural streams gradually channelised from the 18th century onwards and specifically dug canals

As the water had no natural drainage, it was calculated that probably 1000 million tons would have to be raised by mechanical means.

The natural history of this area coupled with the widespread drainage of spring runoff, has created a perfect storm scenario.

The development of the borough has interrupted the natural drainage systems present in the Epler Formation.

All of the natural drainage ways, including the Killinger, Quittapahilla, Spring and Swatara Creeks, lie outside the borough ’ s municipal borders.

" Only an eleven-minute ride from Center Square in York, it featured high ground with perfect natural drainage, cement walks and curbs, macadamized streets, pure filtered water, electric lights, and a complete sewer system.

Environment-current issues: government water control projects have drained most of the inhabited marsh areas east of An Nasiriyah by drying up or diverting the feeder streams and rivers ; a once sizable population of Shi ' a Muslims, who have inhabited these areas for thousands of years, has been displaced ; furthermore, the destruction of the natural habitat poses serious threats to the area's wildlife populations ; inadequate supplies of potable water ; development of Tigris-Euphrates Rivers system contingent upon agreements with upstream riparian Turkey ; air and water pollution ; soil degradation ( salination ) and erosion ; and desertification.

The river is heavily managed in its lower course and water that was previously lost to the sea is now pumped upstream to increase the natural flow, recharge the Llobregat Delta wetlands and control seawater incursion.

Allosteric regulations are a natural example of control loops, such as feedback from downstream products or feedforward from upstream substrates.

For example, about one mile ( 2 km ) upstream of Upper Barton Spring, an intermittent spring fills a popular natural swimming hole.

Because of poor logging practices in the upstream watershed, the historically silty Salween has become many times as turbid as its natural state.

Dams constructed upstream on the Ruby and Beaverhead rivers store surplus water from spring runoff which is released to augment natural flows during the summer irrigation season.

The river 250 metres upstream of the current bridge was passable except at times of flood via a natural rock ford.

Kootenai Falls, which drops some within a run of a few hundred meters, forms a natural boundary between fishes of the upper and lower river, but Libby Dam, several kilometres upstream, is an even more formidable barrier.

Window Cliff, a formation that includes several natural arches overlooking a waterfall, lies along a bend of Cane Creek just upstream from its confluence with the Falling Water River.

The waters were released from this natural dam on September 20, when a concrete bridge broke upstream and tore through the mudslide.

* upstream ( exploration, development and production of crude oil or natural gas )

The group is engaged in a wide spectrum of petroleum activities, including upstream exploration and production of oil and gas to downstream oil refining ; marketing and distribution of petroleum products ; trading ; gas processing and liquefaction ; gas transmission pipeline network operations ; marketing of liquefied natural gas ; petrochemical manufacturing and marketing ; shipping ; automotive engineering ; and property investment.

The project known as a flood water attenuation scheme involved identifying a field immediately upstream of the urban area, this was then excavated below natural ground level to a depth of around 6 feet.

Its primary purpose is flood control and it is the downstream element of the Santa Ana River's flood control system, which is a natural constriction about upstream from the ocean.

The Sundarbans along the Bay of Bengal has evolved over the millennia through natural deposition of upstream sediments accompanied by intertidal segregation.

This secluded 2, 000 acre ( 8 km² ) park is in a natural pocket of the Appalachian Mountain chain, on an upstream tributary of Lake Guntersville.

The word ‘ poros ’ in Greek means ‘ ford ’ or ‘ crossing ’ and where the Vohinas enters the sea is the only natural crossing point, although two bridges now cross the river further upstream where the Vohinas exits the impressive Poros gorge, an 80-metre deep rugged ravine which, until a road was cut through to Skala around 1996, was the only land route out of Poros.

The Canadian Association of Petroleum Producers ( CAPP ) is an advocacy group that provides a public voice for many of the corporations involved in the upstream Canadian oil and natural gas industry.

Lake Pepin's natural flora are threatened by the increased rates of sedimentation from upstream sources, leading The Lake Pepin Legacy Alliance to call the phenomenon a " wet desert.

The river's natural confluence with the Little Tennessee River is located approximately downstream, although the Tellico Reservoir, which covers most of the lower Little Tennessee, is connected to Fort Loudoun Lake via canal which empties into the lake upstream from the dam.

A natural inland waterway connects Choctawhatchee Bay to Pensacola Bay, making it possible for keelboats and later steamboats to navigate between Pensacola, Florida and Geneva, Alabama, and as far upstream as Newton.

It is a natural swimming pool 20 meters width, 40 meters in length and about 3 to 4 meters deep at the center, crystal-clear water and free flowing from upstream to the shallow end, going down the famous Bugang River.

The Big Western Line, a possible element of the South – North Water Transfer Project, is a proposal for diverting water from the upstream sections of six rivers in southwestern China, including the Mekong, the Yarlung Tsangpo and the Salween, to the dry areas of northern China through a system of reservoirs, tunnels and natural rivers.

The upstream oil sector is a term commonly used to refer to the searching for and the recovery and production of crude oil and natural gas.