Water-bearing and Water-resisting Layers

Buried Depth of Floor (m)

Minimum-maximum

Average

Pure Thickness (m)

Minimum-maximum

Average

Hydrogeological Characteristics

First aquifer

85.20 - 86.30

85.70

37.30 - 45.75

40.41

It is composed of clay, sandy clay and fine sand. It is recharged by atmospheric precipitation and surface water. It has medium water-rich property and multi-layer groundwater. Unit inflow 0.6396 L/s∙m, hydrochemical type SO₄∙Cl − K + Na, salinity 1.522 g/L.

First aquifer

136.10 - 138.30

136.87

44.80 - 48.20

46.23

Gray green, brown yellow clay, sandy clay, plastic index 17.1 - 24.8, water barrier performance is good.

The second aquifer

332.20 - 334.30

333.37

73.00 - 78.10

75.27

Medium and fine sand, clay, sandy clay composition. The sand layer is loose, with many layers but small single layer thickness and strong water-rich property.

The second waterproof layer

542.00 - 546.60

544.47

144.00 - 159.70

151.19

Clay, sandy clay, with columnar, tabular gypsum crystals, rich in montmorillonite, stable thickness, good water insulation performance.

The third aquifer

583.10 - 587.40

585.57

25.50 - 37.00

30.81

It is also called “bottom contains”. Coarse sand, medium sand, sand layer thickness changes greatly, poor continuity part of clay 2 - 4 layers. Unit inflow 0.0009 - 0.0152 L/s∙m, permeability 0.0028 - 0.0512 m/d, hydrochemical type SO₄ − K + Na∙Ca, salinity 2.216 - 2.844 g/L.