【Name of township】Dung
Chiu、Shi Chiu、Jung Chiu、Nan Chiu、Bei Chiu、Shituen Chiu、Beituen
Chiu、Nantuen Chiu
【Types of terrain】basin
【Description of terrain】
Taichung Basin is bounded by Dajia Stream, Jhuoshuei Stream, a plateau,
and mountains and hills, in the north, south, west, and east,
respectively. It is a narrow south-north oriented alluvial basin, as low
as 25 meters above sea level at the opening of the basin, where Wu
Stream passes through. Near Feng-yuan-zih Woods, located in the
northeastern corner of the basin is 260 meters above sea level; and it
is 160 meters high at the southern corner near Mingjiam, which makes the
lowest point of basin in the middle. It encompasses Dung, Shi, Jung,
Nan, and Bei Chius, and part of Shituen, Beituen, and Nantuen Chius.
【Types of geology】clay、sandy soil、gravel
【Geological description】
Taichung Basin is largely composed of gravels expect for thick layers of clay and sandstone at the surface level in some areas. In terms of distribution of various components of earth, there are discontinuous clay layers in the southwest, northwest, and east sides of Taichung City, averaging 1.4 meters. Under the ground between 15 and 25 meters deep is a continuous gravel layer. Gravel layer in the north area is thicker than 300 meters, primarily composed of large gravels. Largest gravels, sometimes longer than 1.5-1.6 meters in watermelon shape, can be found in Beituen Chiu.
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