Hydro-electric development on the Snake River at Oxen Bend, Oregon . b- ned trith the dan drawn to a scale of 1 inch equalto ten feet. Area sq. in. Vol. of Sect. Sect. Seetion (by planimeter) 1 ft. wide. 1 ft. tide #, () 1-7 9419. 561,500 2-7 1868 230,°00 3-7 1336 207,900 4-7 953 142,950 5-7 605 60,750 C-7 312 46,800 7 .93 93 13,9 50 -10- Xhe material of the dan which is granite was assumedto weigh 150 pounds per cubic foot. The forces sho^nin the fourth column represent the weights of the var-ious sections acting down through the centers of gra-vity
Hydro-electric development on the Snake River at Oxen Bend, Oregon . b- ned trith the dan drawn to a scale of 1 inch equalto ten feet. Area sq. in. Vol. of Sect. Sect. Seetion (by planimeter) 1 ft. wide. 1 ft. tide #, () 1-7 9419. 561,500 2-7 1868 230,°00 3-7 1336 207,900 4-7 953 142,950 5-7 605 60,750 C-7 312 46,800 7 .93 93 13,9 50 -10- Xhe material of the dan which is granite was assumedto weigh 150 pounds per cubic foot. The forces sho^nin the fourth column represent the weights of the var-ious sections acting down through the centers of gra-vity of the respective sections. It is now necessaryto obtain the force and the point of application ofthe force due to the ^ater. The center of pressure,Xc, was determined by the equationX = 2 hj - H-,3 h22 - hiThe force, E, due to the ^ater acting at Xc, wasdetermined by the equation 1J = I bhh^ rr is the reight of one cubic foot of water and isequal to ,b is the width of the section and <vastaken one foot. The remaining terms are explainedby figure Fig. II. -11- *a P 61 84,800 57. 8 76,100 56,700 36,700 97 .9 23,500 12,150 3,960 The following results were obtained. ^oct. hi ho X h 1-7 2-7 3-7 4-7 5-7 30 6-7 2^.6 7 By combining P acting horizontally thru C andtho weight of the dam acting vertically thru the cen-ter of gravity as previously determined, the resultantpressure nay be determined for each section. By con-necting the points where this pressure acts on thetoases of the respective sections, the line of result-ant pressures may be obtained. This line was found tobe very close to the center of the din. It is now necessary to determine the maximumpressure acting on the base of the dan. i— * f e 1 [ J J J 1 1 ii 1 1 1 l sr~ Fig. III. -18» Figure III represents fhe trapezoid of pressure on the base of the dan.
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Keywords: ., bookcentury1900, bookdecade1910, bookidhydroelectri, bookyear1910
