Introducing Groundwater by Michael Price (auth.)

By Michael Price (auth.)

Preface. Acknowledgements. advent. Water underground. Water in flow. Caverns and capillaries. Soil water. Groundwater in movement. extra approximately aquifers. Springs and rivers, deserts and droughts. Water wells. Measurements and versions. Water caliber. toxins and safeguard. Groundwater: good friend or foe? What is going down needs to arise. Epilogue. Index.

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It percolates slowly through the aquifers, at rates which under natural conditions may vary from more than a metre in a day to only a few millimetres in a year. The groundwater moves towards an outlet from the aquifer, which is usually a point where the water table intersects the ground surface. Where this occurs, water will seep or flow from the aquifer; in doing so, it will cease to be groundwater and will revert to being surface water, usually finding its way into a river channel. The water in rivers usually finds its way back to that primary store of the Earth's water, the sea, but there are some exceptions.

Plants grow on and in it, and land plants directly or indirectly provide most of our food and oxygen. The soil is a complicated mixture of organic and inorganic material, a curious blend oflife and decay. It consists essentially of mineral particles, dead organic matter, living organisms, water and air. The mineral particles are derived from the decomposition of rocks by the processes known collectively as weathering; the rock debris may stay more or less in place or be transported by ice, wind or water.

E. the meniscus is a hemisphere with the same radius as the capillary tube. 81 with hand r in metres, or h=12 r with hand r in millimetres. 5 X 10-5 r ---'1 1 C_A_V_E_R_N_S_A_N_D_C_A_P_I_L_L_A_R_I_E_S_ _ _ _ _ _ L -_ _ _ _ _ _ _ All this may seem a little remote from hydrogeology. Surely rocks do not have long thin cylindrical tubes running through them? They do not, but the interconnected pores in a granular material can behave as though they were bundles of capillary tubes. Let's go back to our substitute sandstone, the lump of sugar.

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