The Designing and Construction of Storage ReservoirsD. Van Nostrand, 1888 - 137 Seiten |
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adopted amount ample ANTICLINAL ascer available rainfall bank bankment calculated carry catchment basin chalk cient climate of India cloth considerable course cubic foot culvert depth designed dimensions discharge districts drainage area drains earth earthen dam earthwork embankment engineer equal escape evaporation evident extent favorable feet float flood flow foundation freshet gathering grounds gauging geological gineering greensand height India inner inside irrigation Jacob laid layers length less masonry center wall masonry dam material ment mode of construction mortar necessary oolites Oxford clay passing percolation practice pressure of water probably proportion puddle wall quantity question rain Rainfall per Annum rectangular wall regard result rip-rapped rule shown in Fig side sider slope spill-way springs square miles stones storage reservoirs strata stream suffi sufficient supply surface SYNCLINAL syphon tain taken terial thickness tion valley valve vertical waste pit waste weir water-shed water-tight whole
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Seite 25 - Neither does much take place whenever the atmosphere is more than 15 deg. colder than the surface upon which it acts. Winds powerfully promote evaporation, because they bring the air into continual as well as into closer and more violent contact with the surface acted upon, and also, in the case of liquids, increase by the agitation which they occasion, the number of points of contact between the atmosphere and the liquid.
Seite 26 - Humboldt, from observations made in the passage across the Atlantic, found that in the torrid zone the quantity of vapour contained in the air, is much nearer to the point of saturation than in the temperate zone. The evaporation within the tropics is, on this account, less than might have been supposed from the increase of the temperature.
Seite 26 - Щ), with a mean temperature of 81.86 degrees, it was ascertained to be more than 100 inches in the course of the year ; at Guadaloupe, in the West Indies, it has been observed to amount to 97 inches. The degree of evaporation very much depends upon the difference...
Seite 83 - G, is connected with the reservoir, E, by a pipe, K, which supplies water to float the cylinder, D. Now, it is evident that the discharge from the reservoir will be regulated by the position of the lever, B, and this again will be controlled by the height of the float, D. To regulate this height the supply from the cistern, G, must be self-adjusting, or be regulated by the amount of water flowing away. The float, N, has attached to it a spindle, on which are fixed two double-beat valves that work...