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 6
... tracts of country . 8. If , instead of a few feet of gravel resting on impervious clay , there should exist a regularly stratified deposit of permeable strata , overlying others which are impermeable but not covered by any such beds ...
... tracts of country . 8. If , instead of a few feet of gravel resting on impervious clay , there should exist a regularly stratified deposit of permeable strata , overlying others which are impermeable but not covered by any such beds ...
Page 11
... tract of country , consist of the three following groups . * First . An upper group , composed chiefly of permeable , loose siliceous sands , from 300 to 400 feet thick , known as the Bagshot Sands . Second . A middle group of ...
... tract of country , consist of the three following groups . * First . An upper group , composed chiefly of permeable , loose siliceous sands , from 300 to 400 feet thick , known as the Bagshot Sands . Second . A middle group of ...
Page 12
... tract , composed , in the greater part , of sandy heaths . They are placed on too high a level to allow of very large permanent accumulations of water within their mass . The rain which falls on them is in places partly kept out by a ...
... tract , composed , in the greater part , of sandy heaths . They are placed on too high a level to allow of very large permanent accumulations of water within their mass . The rain which falls on them is in places partly kept out by a ...
Page 13
... tract of country in Kent and Surrey , passes beneath the Tertiary strata in the valley of the Thames at a depth of from 150 to 400 feet , and reap- pears in the hills of Hertfordshire , Buckinghamshire , and adjacent counties . In ...
... tract of country in Kent and Surrey , passes beneath the Tertiary strata in the valley of the Thames at a depth of from 150 to 400 feet , and reap- pears in the hills of Hertfordshire , Buckinghamshire , and adjacent counties . In ...
Page 19
... tracts , where the strata are impermeable . - Sixth . The disturbances which may affect the water- bearing strata and break their continuity , whereby the subterranean flow of water would be impeded or prevented . ‡ To proceed now to ...
... tracts , where the strata are impermeable . - Sixth . The disturbances which may affect the water- bearing strata and break their continuity , whereby the subterranean flow of water would be impeded or prevented . ‡ To proceed now to ...
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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.