Side
af
764
Forrige
Næste
203
OF KNGINEEK1N« rORMULÆ.
Irrigation—continued.
Table showing the Acbeage Irkigated by Diffebbut
Sizes op Channel.
Number of Acres Irrigated. Area of Channel in Sq. Ft., with Velocities in Feet per Second =
2 2i 3 4 4 _ 6
sq. ft. sq. ft. sq. ft. sq,.- ft. sq. ft. sq. ft sq. ft.
100 1 •8 •66 •57 ■5 ■4 •3
200 2 1-6 1'3 1-1 1 •8 •7
300 3 2’4 2 1-7 1-5 1-2 1
-400 4 3’2 2-6 2-3 2 1’6 1’3
500 5 4'0 3-3 2*8 2*5 2 VI
60Ü 6 4-8 4'0 3-4 3 2-4 2
700 1 5'6 4-7 4 3-5 2-8 2-3
800 8 6-4 5-3 4-6 4 3-2 2'7
1000 10 8 6-7 5-7 5 4 3-3
2000 20 16 13’3 11 10 8 6’1
3000 30 24 20 17 15 12 10
4000 40 32 26‘V 23 20 16 13
5000 50 40 33 28 25 20 17
1 Sq. Mile. 6'4 5'12 4-26 3’66 3‘2 2 56 2-13
Table showing, approximately, Dimensions best adapted
FOK IRBIGATION CHANNELS IN NORTHERN INDIA.
(‘Min. Inst. Civ. Eng.,’ vol. xxvii., p. 479, Login.)
Discharge per Second. Calculated Sections. Proposed Sections. Side Slopes.
Mean Velo-i city per 1 Second. o fgd 'S . 11 I86 Ie . jd fl 1 Depth of 1 Water. Slope of Surfiice per Mile.
I Breadt: I Bottoi
feet. feet. feet. inches. feet. feet. inches.
60 2 2 24 4 15 2 <+ 16+ 1 to 1
100 2t 41 Ué 4 5i 16 1 ,, 1
250 2i 15 5 13i 13| 6* 1 ,, 1
500 2i 4i 27; 5i 13 25 6 1 1
1000 3 5 60 6 13 45 «1 1 ,1
2000 3i 6 m 1 13 70 U iH li , 1
3000 3i 7 95 8 12f 85 14 „ 1
4000 3; u 121f 81 12f 110 14 If „ 1
6000 3l 1471 8i 121 130 9| 13f U .. 1
6000 31 8 170 H 12| 150 »1 13f li „ 1