Bulletin of the University of Wisconsin: Engineering series

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The University, 1911 - Water-supply - 192 pages
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Page 63 - ... (4) The effect of forests upon the run-off resulting from snowmelting is to concentrate it into brief periods and thereby increase the severity of freshets.
Page 194 - Its intensity or manner of occurrence. (e) The character of storms, including their direction, extent, and duration. 2. Temperature. (a) The variations of temperature on the area. (b) The relation of extreme temperatures to the occurrence of precipitation. (c) The accumulation of snow and ice, caused by low temperatures.
Page 519 - June 18, 1908, indicate what these tests showed. (1) The rate of delivery of water, and the air consumption per gallon, with fixed size of discharge pipe, are practically constant for all lifts, provided the ratio of lift to submergence is maintained constant. (2) With a discharge pipe of given diameter, the delivery decreases and the air consumption per gallon increases as the ratio of lift to submergence increases.
Page 195 - Nature of the Drainage Area Considered — (a) As to size, whether large or small. (b) As to shape, whether long and narrow, or short and broad. (c) The location of the area relative to prevailing winds. (d) The direction relative to the path of storms. 8. Character of the Stream and Its Tributaries — (a) As to slope or gradient, whether flat or inclined.
Page 575 - Price 35 cents. No. 9. The Problem of Economical Heat, Light, and Power Supply for Building Blocks, School Houses, Dwellings, Etc., by G. Adolph Gerdtzen, BS, Alumni Fellow in Engineering Pp.
Page 63 - ... situated. It acts as a reservoir moderating the run-off from showers and mitigating the severity of freshets, and promotes uniformity of flow at such periods. (2) The above action fails altogether in periods of prolonged and heavy precipitation, which alone produce great general floods. At such times the forest bed becomes thoroughly saturated, and water falling upon it flows off as readily as from the bare soil. Moreover, the forest storage, not being under control, flows out in swollen streams,...
Page 195 - As to whether the surface is level or inclined, and the degree of inclination. (b) As to character of area, whether smooth or rugged. 4. Geology of Drainage Area — (a) Whether pervious or impervious. (b) If pervious, whether such pervious deposits are (a) shallow or deep; (b) level or inclined; whether the outlet or point of discharge of the pervious deposits are (c) in the lower valley of the same river, or (d) in the valleys of other rivers, or in the sea.
Page 524 - ... remaining constant, the maximum efficiency is obtained at approximately 63 per cent submergence for all rates of input or discharge. 8. The lift remaining constant, the efficiency increases as the percentage of submergence increases, for all rates of input and all practical percentages of submergence. 9. With the same size and type of pump, the percentage of submergence remaining constant, the efficiency increased as the lift increased for the small lifts experimented on; that is, up to about...
Page 196 - As to the section of the stream, whether deep or shallow. (d) As to the arrangement of tributaries, whether joining the main stream at various points along its course or concentrated in a fanlike arrangement at a more or less common point of discharge.
Page 62 - In the following seven propositions the author sums up the arguments presented in the foregoing pages : (1) The bed of humus and debris that develops under forest cover retains precipitation during the summer season, or moderately dry periods at any time of the year, more effectively than do the soil and crops of deforested areas similarly situated. It acts as a reservoir moderating the run-off from showers and mitigating the severity of freshets, and promotes uniformity of flow at such periods....

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