A geological inquiry respecting the water-bearing strata of the country around London, with reference especially to the water-supply of the metropolis |
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Page 12
... drift and by thick beds of gravel , but more usually it percolates readily through the sands , which form the hills and higher grounds , and is thrown out again , —either by the cen- tral beds of clay , subordinate to the Bagshot Sands ...
... drift and by thick beds of gravel , but more usually it percolates readily through the sands , which form the hills and higher grounds , and is thrown out again , —either by the cen- tral beds of clay , subordinate to the Bagshot Sands ...
Page 19
... drift . † Fourth . The general elevation of the country occupied by this outcrop above the levels of the district in which it is proposed to sink Artesian wells . Fifth . The quantity of rain which falls in the district under ...
... drift . † Fourth . The general elevation of the country occupied by this outcrop above the levels of the district in which it is proposed to sink Artesian wells . Fifth . The quantity of rain which falls in the district under ...
Page 31
... is bare , except in very heavy rains . It is only when covered by drift , clay , or gravel , that it becomes more apparent . development , which greatly restrict the breadth of the sur- OF WATER - BEARING STRATA . 31.
... is bare , except in very heavy rains . It is only when covered by drift , clay , or gravel , that it becomes more apparent . development , which greatly restrict the breadth of the sur- OF WATER - BEARING STRATA . 31.
Page 35
... drift , which protect the outcropping beds of b , and turn off a portion of the water falling upon them . The Drift differs considerably in its power of interference with the passage of the rain - water into the strata beneath . The ...
... drift , which protect the outcropping beds of b , and turn off a portion of the water falling upon them . The Drift differs considerably in its power of interference with the passage of the rain - water into the strata beneath . The ...
Page 36
... drift , as be- tween West Drayton and Uxbridge , the passage of the surface water into the underlying strata is intercepted . Sometimes the Drift is composed of Gravel mixed very irregularly with broken - up London clay ; and , although ...
... drift , as be- tween West Drayton and Uxbridge , the passage of the surface water into the underlying strata is intercepted . Sometimes the Drift is composed of Gravel mixed very irregularly with broken - up London clay ; and , although ...
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Common terms and phrases
alkaline appear arenaceous argillaceous Artesian average Bedfordshire beds beneath London bore Buckinghamshire calcareous Cambridgeshire carbonate of lime carbonic acid chalk marl considerable Cretaceous crop Degousée depth Devizes division Dorking drainage drift escarpment extent fall fault feet thick fissures flow formation France gallons of water Gault geological Godstone grains gravel green Grenelle ground Guildford height hills impermeable inches iron Kent lithological character London clay Lower Greensand Lower Tertiary sands Lower Tertiary strata mass Merstham mineral mottled clays nearly neighbourhood North Downs observations Oolite outcrop Oxfordshire Paris pass permeable portion probably proportion quantity of water rain rain-fall Reigate rise river rocks Saffron Walden salts sections siliceous soluble springs square miles subterranean sunk superficial area supply of water surface Surrey Tertiary district Thames tract traversed underground Upper Greensand valley varies water-bearing deposit water-bearing strata water-level water-supply Watford whilst
Popular passages
Page 164 - DEGREES OF HARDNESS AND DEGREES OF ALKALINITY EXPLAINED. Degrees of Hardness. — Each degree of hardness indicates as much hardness as would be produced by one grain of chalk per gallon held in solution in the form of bicarbonate of lime, free from any excess of carbonic acid. The degree of hardness caused by a lime salt depends, not on the state of combination of the calcium it contains, but on the quantity of the calcium.