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Hiyoshi Dam
is a concrete gravity dam in Nantan, Kyoto Prefecture, Japan. Constructed from 1992 to 1996, the dam has a height of 67.4 m and a length of 438 m. It creates the artificial lake , with an area of 2.74 km2. Initial planning for its construction started in 1961, as a measure to protect downstream area from frequent floods by the Katsura river. Hiyoshi Dam is used for three main purposes: flood control, river maintenance and water supply. The dam temporarily stores surges in river water during floods, regulating the flow and avoiding damage to downstream areas. The dam is designed for 100-year floods (floods estimated to occur once every 100 years). The maximum release of water during flood control operations in normal situations is 150 m3 per second. However, if not enough, the dam is able to discharge more water when the level in the reservoir surpass the surcharge water level. One such situations occurred in September 2013, when heavy rain from Typhoon 18 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nantan, Kyoto
260px, Rurikei Prefectural Natural Park is a city located in Kyoto Prefecture, Japan. , the city had an estimated population of 30,744 in 14406 households and a population density of 50 persons per km². The total area of the city is . Geography Nantan is located in the southern part of the Tamba region in central Kyoto Prefecture. Neighbouring municipalities Kyoto Prefecture * Kyoto * Ayabe * Kameoka * Kyōtamba Fukui Prefecture * Ōi Shiga Prefecture * Takashima Osaka Prefecture * Nose Hyōgo Prefecture * Tamba-Sasayama Climate Nantan has a Humid climate (Köppen ''Cfa'') characterized by warm, wet summers and cold winters with heavy snowfall. The average annual temperature in Nantan is . The average annual rainfall is with July as the wettest month. The temperatures are highest on average in August, at around , and lowest in January, at around . Its record high is , reached on 21 August 2020, and its record low is , reached on 28 February 1981. Demographics P ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Japan
Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north toward the East China Sea, Philippine Sea, and Taiwan in the south. Japan is a part of the Ring of Fire, and spans Japanese archipelago, an archipelago of List of islands of Japan, 6852 islands covering ; the five main islands are Hokkaido, Honshu (the "mainland"), Shikoku, Kyushu, and Okinawa Island, Okinawa. Tokyo is the Capital of Japan, nation's capital and largest city, followed by Yokohama, Osaka, Nagoya, Sapporo, Fukuoka, Kobe, and Kyoto. Japan is the List of countries and dependencies by population, eleventh most populous country in the world, as well as one of the List of countries and dependencies by population density, most densely populated and Urbanization by country, urbanized. About three-fourths of Geography of Japan, the c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gravity Dam
A gravity dam is a dam constructed from concrete or stone masonry and designed to hold back water by using only the weight of the material and its resistance against the foundation to oppose the horizontal pressure of water pushing against it. Gravity dams are designed so that each section of the dam is stable and independent of any other dam section. Characteristics Gravity dams generally require stiff rock foundations of high bearing strength (slightly weathered to fresh), although in rare cases, they have been built on soil foundations. The bearing strength of the foundation limits the allowable position of the resultant force, influencing the overall stability. Also, the stiff nature of the gravity dam structure is unforgiving to differential foundation settlement, which can induce cracking of the dam structure. Gravity dams provide some advantages over embankment dams, the main advantage being that they can tolerate minor over-topping flows without damage, as the concre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flood Control
Flood control methods are used to reduce or prevent the detrimental effects of flood waters."Flood Control", MSN Encarta, 2008 (see below: Further reading). Flood relief methods are used to reduce the effects of flood waters or high water levels. Flooding can be caused by a mix of both natural processes, such as extreme weather upstream, and human changes to waterbodies and runoff. Though building hard infrastructure to prevent flooding, such as flood walls, can be effective at managing flooding, increased best practice within landscape engineering is to rely more on soft infrastructure and natural systems, such as marshes and flood plains, for handling the increase in water. For flooding on coasts, coastal management practices have to not only handle changes water flow, but also natural processes like tides. Flood control and relief is a particularly important part of climate change adaptation and climate resilience, both sea level rise and changes in the weather (climate cha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Water Supply
Water supply is the provision of water by public utilities, commercial organisations, community endeavors or by individuals, usually via a system of pumps and pipes. Public water supply systems are crucial to properly functioning societies. These systems are what supply drinking water to populations around the globe. Aspects of service quality include continuity of supply, water quality and water pressure. The institutional responsibility for water supply is arranged differently in different countries and regions (urban versus rural). It usually includes issues surrounding policy and regulation, service provision and standardization. The cost of supplying water consists, to a very large extent, of fixed costs (capital costs and personnel costs) and only to a small extent of variable costs that depend on the amount of water consumed (mainly energy and chemicals). Almost all service providers in the world charge tariffs to recover part of their costs. Water supply is a separate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flood
A flood is an overflow of water ( or rarely other fluids) that submerges land that is usually dry. In the sense of "flowing water", the word may also be applied to the inflow of the tide. Floods are an area of study of the discipline hydrology and are of significant concern in agriculture, civil engineering and public health. Human changes to the environment often increase the intensity and frequency of flooding, for example land use changes such as deforestation and removal of wetlands, changes in waterway course or flood controls such as with levees, and larger environmental issues such as climate change and sea level rise. In particular climate change's increased rainfall and extreme weather events increases the severity of other causes for flooding, resulting in more intense floods and increased flood risk. Flooding may occur as an overflow of water from water bodies, such as a river, lake, or ocean, in which the water overtops or breaks levees, resulting ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Typhoon Man-yi (2013)
Typhoon Man-yi was a very severe storm that brought very strong winds and flash floods to Japan during mid-September. The third typhoon of the 2013 Pacific typhoon season, Man-yi was identified on September 10. It became a storm on September 12 and reached peak intensity on September 15. Japan was then experiencing winds above 30 knots. Typhoon Man-yi became extratropical on September 16 and fully dissipated late on September 20 in the Kamchatka Peninsula region, bringing strong winds until September 25. Meteorological history A large disturbance formed near the Northern Mariana Islands late on September 9. Late on September 11, the JMA reported that the disturbance intensified to a tropical depression had developed about to the northeast of Saipan, in the Northern Mariana Islands. It was designated as ''16W'' by the JTWC and JMA upgraded to a tropical storm naming it ''Man-yi'' on September 13, moving north then west on September 13. Man-yi still started intensifying and g ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spillway
A spillway is a structure used to provide the controlled release of water downstream from a dam or levee, typically into the riverbed of the dammed river itself. In the United Kingdom, they may be known as overflow channels. Spillways ensure that water does not damage parts of the structure not designed to convey water. Spillways can include floodgates and fuse plugs to regulate water flow and reservoir level. Such features enable a spillway to regulate downstream flow—by releasing water in a controlled manner before the reservoir is full, operators can prevent an unacceptably large release later. Other uses of the term "spillway" include bypasses of dams and outlets of channels used during high water, and outlet channels carved through natural dams such as moraines. Water normally flows over a spillway only during flood periods, when the reservoir has reached its capacity and water continues entering faster than it can be released. In contrast, an intake tower is a structure ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Osaka Prefecture
is a Prefectures of Japan, prefecture of Japan located in the Kansai region of Honshu. Osaka Prefecture has a population of 8,778,035 () and has a geographic area of . Osaka Prefecture borders Hyōgo Prefecture to the northwest, Kyoto Prefecture to the north, Nara Prefecture to the southeast, and Wakayama Prefecture to the south. Osaka is the capital and largest city of Osaka Prefecture, and the List of cities in Japan, third-largest city in Japan, with other major cities including Sakai, Higashiōsaka, and Hirakata. Osaka Prefecture is the third-most-populous prefecture, but by geographic area the second-smallest; at it is the second-most densely populated, below only Tokyo. Osaka Prefecture is one of Japan's two "Fu (country subdivision), urban prefectures" using the designation ''fu'' (府) rather than the standard ''Prefectures of Japan#Types of prefecture, ken'' for prefectures, along with Kyoto Prefecture. Osaka Prefecture forms the center of the Keihanshin metropolitan ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Dams And Reservoirs In Japan
As a nation of islands and narrow, steep valleys, dams play a vital role in Japanese society as they are constructed primarily to control floods, supply water and generate hydroelectric power. The tallest dam in Japan is the high Kurobe Dam. The largest dam by structural volume in the country is the Tokuyama Dam ''(pictured)'' with of rock-fill. Tokuyama also creates Japan's largest reservoir with a water volume of . The dams are arranged by prefecture in the list below. Chubu region * Aichi * Fukui * Gifu * Ishikawa * Nagano * Niigata * Shizuoka * Toyama * Yamanashi Chugoku region * Hiroshima * Okayama * Shimane * Tottori * Yamaguchi Kansai region * Hyogo * Kyoto * Mie * Nara * Osaka * Shiga * Wakayama Kanto region * Chiba * Gunma * Ibaraki * Kanagawa * Saitama * Tochigi * Tokyo Kyushu region * Fukuoka * Kagoshima * Kumamoto * Miyazaki * Nagasaki * Okinawa * Oita * Saga Hokkaido region * Hokkaido Shikoku region * Ehime * Kagawa * Kochi * Tokushima Tohoku re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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