Topographic Features
Topography and Landforms
Changchun covers a total area of 24,744 square kilometers. Most of the region lies within the Songliao Plain, characterized by relatively flat terrain. The average elevation is 202 meters, with the highest point reaching 711 meters and the lowest point at 137.5 meters.
Climate Conditions
Situated in the mid-latitude region of the Eurasian continent, Changchun has a temperate continental monsoon climate. Based on data from the Changchun Meteorological Station over the past 30 years, the city receives an average annual precipitation of 564.1 mm and has an average annual temperature of 6°C. The average summer temperature is 22.3°C, while the average winter temperature is -15.7°C. Extreme minimum temperatures can fall below -30°C.
The Second Songhua River
Originating from “Sky Pool” of Changbai Mountain, It runs 849 kilometers and covers a total water area of 78180 square kilometers, which is known as the largest river within the territory of Changchun and the largest tributary of Songhua River. The Changchun section of the Second Songhua River runs 188.2 kilometers covers a total water area of 1499.6 square kilometers, with an average depth of 2.5 meters and width between 250 and 280 meter. During flood season, the width may range between 600 and 1, 500 meters, and occasionally even 760 and 3, 500 meters. The annual runoff reaches 16 billion cubic meters. Winding through the wide alluvial plains, the Second Songhua River section is of great importance to the local corn and rice production.
Yinma River
As the first-level tributary of Songhua River, it is also one of the most important rivers in Changchun area.
The river runs 386.8 kilometers and covers a total water area of 18, 247 square kilometers. Changchun section records 293.6 kilometers and covers a total water area of 11122.9 square kilometers. The annual runoff, ranking after Songhua River and Lalin River, amounts to 1.6 billion cubic meters. Its irrigation area has been increased to 11, 500 hectares, increased by 57 times, from 200 hectares before 1949.
Established in 1959, Shentoumen Reservoir supplies 13, 300 and 4, 000 cubic meters respectively for agricultural irrigation and drinking water annually. It also plays an important role in electricity generating, fishery and so on.
Yitong River
It is the largest tributary of Yinma River and one of the major rivers in Changchun area. Originating from the northern part of Qingding Mountain, Yitong County, it winds through Changchun and Dehui, and into Yinma River in Nongan County.
Yitong River runs 342.5 kilometers and covers a total water area of 8, 440 square kilometers. Changchun section records 286.9 kilometers and covers 5412.9 square kilometers. During the flood season, the width ranges from 70 to 100 meters, occasionally, from 110 to 3000 meters. The surrounding areas have relatively developed agricultural economy.
Yitong River ever contributed a lot to the establishment and development of Changchun City. In earlier days, the local residents could transport grains and woods, and expand business relations with neighboring areas, thereby facilitating the local economy. During the late Qing Dynasty, however, it lost its waterway functions because of the hydrological changes and was substituted by railway transportation.
