Dajia River () is the fifth-longest river in

Taiwan Taiwan, officially the Republic of China (ROC), is a country in East Asia, at the junction of the East and South China Seas in the northwestern Pacific Ocean, with the People's Republic of China (PRC) to the northwest, Japan to the nort ...

located in the north-central of the island. It flows through

Taichung City Taichung (, Wade–Giles: ''Tʻai²-chung¹'', pinyin: ''Táizhōng''), officially Taichung City, is a special municipality located in central Taiwan. Taichung has approximately 2.8 million residents and is the second most populous city of Taiw ...

for 142 km. The sources of the Dajia are:

Hsuehshan Xueshan, formerly known as and by other names, is a mountain in the Heping District of Taichung, Taiwan. It is the 2nd-highest mountain in Taiwan and in East Asia, at above sea level. It is located in the Shei-Pa National Park and is visi ...

and

Nanhu Mountain Mount Nanhu () is a mountain in Taroko National Park, Heping District, Taichung, Taiwan with an elevation of 3,742 m (12,277 ft). It is the 5th highest mountain in Taiwan. Nanhu Salamander ('' Hynobius glacialis'') is a rare salamander that ...

in the

Central Mountain Range The Central Mountain Range is the principal mountain range on the island of Taiwan. It runs from the north of the island to the south. Due to this separation, connecting between the west and east is not very convenient. The tallest peak of th ...

. The Dajia River flows through the Taichung City districts of Heping, Xinshe, Dongshi,

Shigang Shigang District () is a rural district in Taichung City, Taiwan. Geography It has a population total of 15,405 and an area of 18.2105 square kilometres. Administrative divisions Shigang, Wanan, Jiufang, Jinxing, Longxing, Wanxing, Meizi, T ...

Fengyuan Fengyuan District () is a district located in north-central Taichung, Taiwan on the south bank of the Dajia River. Fengyuan district is the third most populated district among former Taichung County, ranking after Dali and Taiping district. Feng ...

, Houli, Shengang, Waipu, Dajia, Qingshui, and Da'an before emptying into the

Taiwan Strait The Taiwan Strait is a -wide strait separating the island of Taiwan and continental Asia. The strait is part of the South China Sea and connects to the East China Sea to the north. The narrowest part is wide. The Taiwan Strait is itself a s ...

. The Deji Reservoir (), formed by

Techi Dam Techi Dam () is a concrete thin arch dam on the Dajia River in Heping District, Taichung, Taiwan. Forming the Techi Reservoir (德基水庫), the dam is built in the Tachien Gorge in Heping District, providing hydroelectric power, irrigation wat ...

, is a 592-hectare reservoir in Dajia District. The reservoir provides municipal water, generates hydroelectric power, is used for recreation and prevents flooding. Techi and a cascade of five other dams on the Dajia produce up to 1,100

megawatt The watt (symbol: W) is the unit of Power (physics), power or radiant flux in the International System of Units, International System of Units (SI), equal to 1 joule per second or 1 kg⋅m2⋅s−3. It is used to quantification (science), ...

s of hydroelectric power and generate more than 2.4 billion

KWh A kilowatt-hour (unit symbol: kW⋅h or kW h; commonly written as kWh) is a unit of energy: one kilowatt of power for one hour. In terms of SI derived units with special names, it equals 3.6 megajoules (MJ). Kilowatt-hours are a common bil ...

per year. The other five dams in sequence from top hill are

Qingshan Dam Qingshan Dam () is a concrete gravity forebay dam on the Dajia River in Heping District, Taichung, Taiwan. The dam is the second in a cascade of hydroelectric power plants along the Dajia River, and is located directly below the Techi Dam and u ...

Kukuan Dam Kukuan Dam () is a concrete thin arch dam on the Dajia River in Heping District, Taichung, Taiwan. The dam serves for hydroelectric power generation and flood control, and is the third in a cascade of hydroelectric dams on the Dajia River, being ...

Tienlun Dam Tienlun Dam () is a concrete gravity dam on the Dajia River in Heping District, Taichung, Taiwan. Built from 1952 to 1956, the dam is the fourth in a cascade of hydroelectric dams along the Dajia River, located upstream from the Ma'an Dam and d ...

Ma'an Dam The Ma'an Dam (, 'Saddle Dam') is a concrete gravity barrage dam on the Dajia River in Heping District, Taichung, Taiwan. The dam is the final stage of a cascade of hydroelectric power plants along the Dajia River and is located below the Tienlun ...

and

Shigang Dam Shihgang Dam () is a concrete gravity barrage dam across the Dajia River in Shigang District and Dongshi District of Taichung, Taiwan, located near Fengyuan District. The dam was built from 1974 to 1977 for flood control and irrigation purposes, ...

. Taiwan's

Central Cross-Island Highway The Central Cross-Island Highway () or Provincial Highway 8 is one of three highway systems that connect the west coast with the east of Taiwan. Construction The construction of the Central Cross-Island Highway began on July 7, 1956 and was ...

runs along the Dajia River from Heping to Dongshih. The Taichung Beltway begins in Fongyuan and follows the Dajia through into Cingshuei.

Incidents

The Dajia experiences frequent

earthflow An earthflow (earth flow) is a downslope viscous flow of fine-grained materials that have been saturated with water and moves under the pull of gravity. It is an intermediate type of mass wasting that is between downhill creep and mudflow. The ty ...

s during

typhoons A typhoon is a mature tropical cyclone that develops between 180° and 100°E in the Northern Hemisphere. This region is referred to as the Northwestern Pacific Basin, and is the most active tropical cyclone basin on Earth, accounting for a ...

and heavy

rain Rain is water droplets that have condensed from atmospheric water vapor and then fall under gravity. Rain is a major component of the water cycle and is responsible for depositing most of the fresh water on the Earth. It provides water f ...

, damaging homes and breaking up roads, sometimes permanently. In September 2008, rains from Typhoon Sinlaku resulted in storm-swollen waters which washed away supports for a section of Houfeng Bridge (which links Houli Township and Fengyuan City), leaving six people dead. In June 2010, the bridge finally reopened to vehicular traffic after over

NT$ The New Taiwan dollar (code: TWD; symbol: NT$, also abbreviated as NT) is the official currency of Taiwan. The New Taiwan dollar has been the currency of Taiwan since 1949, when it replaced the Old Taiwan dollar, at a rate of 40,000 old dollars ...

1.4 billion of reconstruction work.

References

Landforms of Taichung Rivers of Taiwan {{Taiwan-river-stub

Incidents

See also

References