32 



BULLETIN 854, U. S. DEPARTMENT OE AGRICULTURE. 



Table 4. — Elements of experiments for concrete tile — Continued. 



12-INCH TILE. 



1 



Test No. 



2 



Depth 



of 

 flow. 



(d) 



3 



d 

 D 



4 



Area 



of 

 flow. 



(a) 



5 



a 

 A 



6 



Ho- 

 draulic 

 rsdius. 



7 



Die- 

 charge. 



(Q) 



8 



Ve- 

 locity. 



(TO 



9 

 Slope. 



10 



Kutter 

 coeffi- 

 cienl. 



(») 



11 



Chezy 

 coeffi- 

 cient. 



766 1 



Feet. 



0.953 

 .950 

 .880 

 .831 

 .774 

 .741 

 .680 

 .631 

 .581 

 .531 

 .471 

 .360 

 .259 



.960 

 .924 

 .844 

 .773 

 .728 

 .673 

 .634 

 .573 

 .527 

 .470 

 .352 

 .254 



.963 

 .932 

 .690 

 .606 

 .573 

 .526 

 .463 

 .371 

 .254 



.741 

 .641 

 .613 

 . 569 

 .534 

 .485 

 .391 

 .284 



.628 

 .530 

 .453 

 .375 

 .322 



.521 

 .520 

 .478 

 .359 

 .324 



.523 



.454 

 .354 

 .302 



.482 

 .399 

 .301 



0.96 

 .96 

 .89 

 .84 

 .78 

 .75 

 .69 

 .64 

 .59 

 .54 

 .47 

 .36 

 .26 



.97 

 .93 

 .85 

 .78 

 .73 

 .68 

 .64 

 .58 

 .53 

 .47 

 .36 

 .26 



.97 

 .94 

 .70 

 .61 

 .58 

 .53 

 .47 

 .37 

 .26 



.75 



.65 

 .62 

 .57 

 .54 

 .49 

 .39 

 .29 



.03 

 .53 

 .46 

 .38 

 .32 



.53 

 .52 

 .48 

 .36 

 .33 



.53 



.46 

 .36 

 .30 



.49 

 .40 

 .30 



Sq.ft. 



0. 7623 



.7610 



.7244 

 .6910 

 .6467 

 .6189 

 .5645 

 .5184 

 .4701 

 .4211 

 .3616 

 .2532 

 .1606 



.7647 

 .7492 

 .7003 

 .6459 

 .6077 

 .5580 

 .5213 

 .4623 

 .4170 

 .3606 

 .2456 

 .1563 



.7657 

 .7532 

 .5735 

 .4944 

 .4623 

 .4161 

 .3536 

 .2637 

 .1563 



.6189 

 . 5279 

 .5012 

 .4584 

 .4240 

 .3754 

 .2830 

 .1827 



.5156 

 .4200 

 .3437 

 .2675 

 .2174 



.4111 

 .4101 

 .3685 

 .2523 

 .2193 



.4131 



.3447 

 .2475 

 .1990 



.3725 

 .2908 

 .1981 



9.99 

 .99 

 .94 

 .90 

 .84 

 .80 

 .73 

 .67 

 .61 

 .55 

 .47 

 .33 

 .21 



.99 

 .97 

 .91 

 .84 

 .79 

 .72 

 .68 

 .60 

 .54 

 .47 

 .32 

 .20 



.99 

 .98 

 .74 

 .64 

 .60 

 .54 

 .46 

 .34 

 .20 



.80 

 .68 

 .65 

 .59 

 .55 

 .49 

 .37 

 .24 



.67 

 .54 

 .45 

 .35 

 .28 



.53 

 .53 

 .48 

 .33 

 .28 



.54 

 .45 

 .32 

 .26 



.48 

 .38 

 .26 



Feet. 

 0. 2801 

 .2812 

 .2974 

 .3013 

 .3012 

 .2989 

 .2919 

 .2828 

 .2720 

 .2585 

 .2397 

 .1974 

 .1509 



.2771 

 .2893 

 .3007 

 .3011 

 .2974 

 .2908 

 .2834 

 .2700 

 .2574 

 .2393 

 .1940 

 .1484 



.2757 

 .2872 

 .2932 

 . .2776 

 .2700 

 .2571 

 .2370 

 .2020 

 .1484 



.2988* 



.2849 



.2791 



.2690 



. 2594 



.2444 



.2102 



.1631 



.2822 

 .2582 

 .2335 

 .2036 

 .1808 



. 2556 

 .2553 

 .2420 

 .1970 

 .1817 



.2517 

 .2339 

 .1949 

 .1716 



.2433 

 .2133 

 .1711 



Cu.ft. 



per sec. 



1.3180 



1.2980 



1. 2460 



1. 1900 



1.0920 



1.0164 



.9312 



.8492 



.7255 



.6278 



.5114 



.3018 



.1443 



1.8400 



1. 7525 



1. 6575 



1. 5350 



1.41P0 



1. 2520 



1. 1300 



.9838 



.8364 



.6804 



.3820 



.1821 



2. 2470 



2. 1660 



1. 5180 



1.2800 



1. 1800 



1.0183 



.8172 



.5186 



.2333 



2. 2920 

 1.9170 

 1. 7800 

 1.57(0 

 1.3750 

 1. 1880 

 .7900 

 .4600 



1.9700 



1. 5900 



1.2320 



.8573 



.5954 



1.7150 



1. 7425 



1.4960 



.9040 



.6846 



2. 0080 



1. 5900 



1. 0420 



.8010 



1.9780 



1.4080 



.8510 



Feet 

 per sec. 

 1.729 

 1.706 

 1.720 

 1.722 

 1.689 

 1.642 

 1.650 

 1.638 

 1.543 

 1.491 

 1.414 

 1.192 

 .898 



2.406 

 2.339 

 2. 367 

 2.377 

 2.331 

 2.244 

 2. 168 

 2.128 

 2.006 

 1.887 

 1.556 

 1.165 



2. 935 

 2.876 

 2.647 

 2.589 



2. 552 

 2.448 

 2.311 

 1.967 

 1.493 



3.704 

 3.631 

 3.552 

 3.438 

 3.243 

 3. 165 

 2.792 

 2.518 



3.821 

 3. 786 

 3. 585 



3. 205 

 2.739 



4.172 

 4.249 

 4. 000 

 3. 584 

 3.123 



4.860 

 4.613 

 4.211 

 4.026 



5.310 

 4.843 



4.295 



0.0010 

 .0010 

 .0010 

 .0010 

 .0010 

 .0100 

 .0010 

 .0010 

 .0010 

 .0010 

 .0010 

 .0010 

 .0010 



.0020 

 .0020 

 .0020 

 .0020 

 .0020 

 .0020 

 .0020 

 .0020 

 .0020 

 .0020 

 .0020 

 .0020 



.0030 

 .0030 

 .0030 

 .0030 

 .0030 

 . 0030 

 .0030 

 .0030 

 .0030 



.0050 

 .0050 

 .01)50 

 . 0050 

 . 0050 

 .0050 

 .0050 

 .0050 



.0075 

 . 0075 

 . 0075 

 .0075 

 .0075 



.0100 

 . 0100 

 .0100 

 .0100 

 .0100 



.0125 

 .0125 

 .0125 

 .0125 



.0150 

 . 0150 

 .0150 



0. 0115 

 .0116 

 .0119 

 .0120 

 .0122 

 .0124 

 .0121 

 .0120 

 .0123 

 .0122 

 .0122 

 .0124 

 .0131 



.0116 



.0121 

 .0123 

 .0123 

 .0124 

 . 0126 

 .0128 

 .0126 

 .0129 

 .0128 

 .0132 

 .0139 



.0116 

 .0121 

 . 0130 

 .0128 

 .0129 

 .0128 

 .0128 

 .0132 

 .0134 



.0124 

 .0122 

 .0124 

 .0124 

 .0127 

 .0124 

 .0125 

 .0117 



.0138 

 .0131 

 .0129 

 .0129 

 .0136 



.0136 

 .0134 

 . 0134 

 . 0131 

 .0138 



.0130 

 .0130 

 .0125 

 .0120 



.0128 

 .0127 

 .0122 



103.3 



767 



101.7 



768 



99.8 



769 



99.2 



770 



97.3 



771 



95.0 



772 



96.6 



773 



97.4 



774 



93.6 



775 



92.7 



776 



91.4 



777 



84.8 



778 



73.1 



7791 



102.2 



780 



97.3 



781 



96.5 



782 



96.9 



783 



95.6 



784 



93.1 



785 



91.1 



786 



91.6 



787 



88.4 



788 



86.3 



789 



79.0 



790 



67.6 



7911 



102.1 



792 



98.0 



793 



89.3 



794 



89.7 



795 



89.7 



796 



88.2 



797 



86.7 



798 



79.9 



799 



70.8 



800 



95.8 



801 



96.2 



802 



95.1 



803 



93.8 



804 



90.1 



805 



90.5 



806 



86.1 



807 



88.2 



808 



83.1 



809 '. 



86.0 



810 



85.7 



811 



82.0 



812 



V 1 





82.5 



814 



84.1 





82.5 



816 



80.7 



817 



73.3 



818 



86.6 



819 



85.3 



820 



85.3 



821 



86.9 



822 



87.9 



823 



85.6 



824 



84.8 







1 Those tests used in deriving formulae 20 and 28. 



