A nullah or nala (Hindustani or "nallah" in Punjabi) is an 'arm of the sea', stream, or watercourse, a steep narrow valley. Like the wadi of the Arabs, the nullah is characteristic of mountainous or hilly country where there is little rainfall.
In the drier parts of India and Pakistan, and in many parts of Australia, there are small steep-sided valleys penetrating the hills, clothed with rough brushwood or small trees growing in the stony soil. During occasional heavy rains, torrents rush down the nullahs and quickly disappear. There is little local action upon the sides, while the bed is lowered, and consequently these valleys are narrow and steep. In cities on the Delhi plain in India, nullahs are concrete or brick-lined ditches about 3 metres (10 ft) deep and 6 metres (20 ft) wide, used to divert monsoon rain away from the cities.
Encroachment into nullahs is a significant problem in many South Asian cities, since it hampers the drainage of stormwater and can exacerbate floods. [1] [2] [3]
In East Asia, a nullah (Chinese :明渠; pinyin :míngqú; Wade–Giles :ming2-chʻü2; Jyutping :ming4 keoi4; lit.'open ditch ') refers to an open, usually concrete-lined flood control channel designed to allow rapid drainage of stormwater or a sewerage channel for industrial wastewater from high ground, to prevent flooding or stagnation in urbanised coastal areas, [4] and basically is an often dry canal used as a reserve drain. One such example is the Kai Tak Nullah in Hong Kong.[ citation needed ]
Central Plaza is a 78-storey, 374 m (1,227 ft) skyscraper at 18 Harbour Road, in Wan Chai on Hong Kong Island in Hong Kong. Completed in August 1992, it is the third tallest tower in the city after 2 International Finance Centre in Central and the International Commerce Centre in West Kowloon. It was the tallest building in Asia from 1992 to 1996, until the Shun Hing Square was built in Shenzhen, a neighbouring city. Central Plaza surpassed the Bank of China Tower as the tallest building in Hong Kong until the completion of 2 IFC.
The Hong Kong Special Administrative Region (HKSAR), can be divided into three geographical regions: Hong Kong Island, Kowloon, and the New Territories. Hong Kong is a coastal city, bordering Guangdong Province through the city of Shenzhen to the north and the South China Sea to the east, south, and west. Hong Kong and its 260 nearby islands and peninsulas are located at the mouth of the Pearl River Delta. The area of Hong Kong is distinct from mainland China, but is considered a part of "Greater China".
A levee, dike, dyke, embankment, floodbank, or stop bank is an elevated ridge, natural or artificial, alongside the banks of a river, often intended to protect against flooding of the area adjoining the river. It is usually earthen and often runs parallel to the course of a river in its floodplain or along low-lying coastlines.
The Brahmaputra is a trans-boundary river which flows through Southwestern China, Northeastern India, and Bangladesh. It is known as Brahmaputra or Luit in Assamese, Yarlung Tsangpo in Tibetan, the Siang/Dihang River in Arunachali, and Jamuna River in Bengali. By itself, it is the 9th largest river in the world by discharge, and the 15th longest.
The ecology of Hong Kong is mostly affected by the results of climatic changes. Hong Kong's climate is seasonal due to alternating wind direction between winter and summer.
The Shing Mun River or Shing Mun River Channel is a river in Sha Tin, Hong Kong.
An arroyo, from Spanish arroyo, also called a wash, is a dry watercourse that temporarily or seasonally fills and flows after sufficient rain. Flash floods are common in arroyos following thunderstorms. It's akin to the Catalan rambla, which stems from the Arabic rámla, "dry river".
A balancing lake is a term used in the U.K. describing a retention basin used to control flooding by temporarily storing flood waters. The term balancing pond is also used, though typically for smaller storage facilities for streams and brooks.
Castle Peak or Pui To Shan (杯渡山) is a 583-metre (1,913-feet)-high peak in western New Territories, Hong Kong. It is also the highest granitic hill in Hong Kong.
The Stormwater Management And Road Tunnel, E38, is a storm drainage and road structure in Kuala Lumpur, Malaysia, and a major national project in the country. The 9.7 km (6.0 mi) tunnel is the longest stormwater drainage tunnel in Southeast Asia and second longest in Asia.
Sustainable drainage systems are a collection of water management practices that aim to align modern drainage systems with natural water processes and are part of a larger green infrastructure strategy. SuDS efforts make urban drainage systems more compatible with components of the natural water cycle such as storm surge overflows, soil percolation, and bio-filtration. These efforts hope to mitigate the effect human development has had or may have on the natural water cycle, particularly surface runoff and water pollution trends.
Ladakh is an administrative territory of India that has been under its control since 1947. The geographical region of Ladakh union territory is the highest altitude plateau region in India, incorporating parts of the Himalayan and Karakoram mountain ranges and the upper Indus River and valley.
Stone Nullah Lane is a one-way street in Wan Chai, Hong Kong Island, Hong Kong. Named after the water channel that until 1959 ran down its middle, it stretches from Lung On Street to Queen's Road East. The street is noted for its historical landmarks, most notably the Blue House and Wan Chai Pak Tai Temple.
A check dam is a small, sometimes temporary, dam constructed across a swale, drainage ditch, or waterway to counteract erosion by reducing water flow velocity. Check dams themselves are not a type of new technology; rather, they are an ancient technique dating from the second century AD. Check dams are typically, though not always, implemented in a system of several dams situated at regular intervals across the area of interest.
The Central and Western District located on northwestern part of Hong Kong Island is one of the 18 administrative districts of Hong Kong. It had a population of 243,266 in 2016. The district has the most educated residents with the second highest income and the third lowest population due to its relatively small size.
The Kai Tak Nullah is a nullah or watercourse that collects water from the rivers and streams flowing from the hills in northern New Kowloon. It empties into a narrow channel leading into the Kwun Tong Typhoon Shelter. Part of the nullah is covered by roads and other facilities.
The Adyar River, which originates near the Chembarambakkam Lake in the Kanchipuram district, is one of the three rivers that winds through Chennai, Tamil Nadu, India, and joins the Bay of Bengal at the Adyar estuary. The 42.5-kilometre (26.4 mi) long river contributes to the estuarine ecosystem of Chennai. Despite the high pollution levels, boating and fishing take place in this river. The river collects surplus water from about 200 tanks and lakes, small streams and the rainwater drains in the city, with a combined catchment area of 860 square kilometres (331 sq mi). Most of the waste from the city is drained into this river and the Cooum.
Buddha Nullah or Buddha Nala is a seasonal water stream, which runs through the Malwa region of Punjab, India, and after passing through highly populated Ludhiana district, Punjab, India, it drains into Sutlej River, a tributary of the Indus River. Today, it has also become a major source of pollution in the region as well the main Sutlej river, as it gets polluted after entering the highly populated and industrialized Ludhiana city, turning it into an open drain. Also, since large area in south-western Punjab solely depend on the canal water for irrigation, and water from Buddha Nullah enters various canals after Harike waterworks near Firozpur, thus affecting far-reaching areas such as Malout, Zira, upper Lambi, while the areas being fed by Sirhind feeder, are the most-affected by its pollution.
The Drainage Services Department (DSD) is a department of the Hong Kong Government responsible for drainage and sewerage. Since 2007 it has been subordinate to the Development Bureau.
Sydenham Pit & Drainage Pumping Station 1 is a heritage-listed pumping station and stormwater drain in Garden Street, Marrickville, Inner West Council, Sydney, New South Wales, Australia. The facility is located adjacent to the railway line running between Sydenham railway station and St Peters railway station. It was designed by the NSW Public Works Department, which built the project from 1935 to 1941. It is also known as Sydenham Stormwater Basin and Drainage Pumping Station (DPS1). The property is owned by Sydney Water. It was added to the New South Wales State Heritage Register on 15 November 2002.