Geographical environment of Meixian county

Meixian county belongs to the Weihe River system of the Yellow River Basin, with 19 rivers. The largest river in China is the east-west Weihe River, with a length of 25 kilometers and a water area of 79. 13 square kilometers. The eastern part of the river is wide, with many interbedded beaches, and the western part is narrow, with the narrowest point being only 100 m, the widest point being 1.5 km, the annual average flow rate being 124.2 m3/s, and the maximum flood peak flow rate. Taking five first-class tributaries of Weihe River, such as Shitou River and Wang Ba River, as statistical caliber, the total water area is 795.34 square kilometers, and the total flow length is 24 1. 15 kilometers, which flows into Weihe River from north to south.

Meixian county has a wide distribution of groundwater and abundant water. There are many leaks and discharges at the foot of the steep cliff of the flood alluvial plain and the first step of Weihe River. The most obvious ones are Hengqu Jiebei Village, east of Huaiya, Xishi Forest, Jinqu Jiao Fang, Hedi, Shoushan Beixing and Wu Hui Temple. , the exposure flow is between 10-70 cubic meters per hour. County Records of Qing Dynasty: There are dozens of fish Longquan, Yiwanquan and Huaiya Springs in the county. The water quality is sweet and has few impurities. In particular, Tangyu underground hot springs have a long reputation. It belongs to low salinity and weak alkaline sodium sulfide hot water, with water temperature as high as 50-70℃, average daily water output of 500-600 cubic meters and annual geothermal water output of 237,000 cubic meters. Rich in potassium, sodium, magnesium and other elements, it is a valuable geothermal water resource in this county.