FACTORS AND TABLES OF EQUIVALENTS USED IN FORESTRY 23 

 Table 39. — Discharge of water: conversion of second-feet into runoff in acre-feet 



Second-feet 



Period in days 



1 



5 



10 



15 



20 



28 



29 



30 



31 



61.5 

 123.0 

 184.5 

 246.0 

 307.4 

 368. 9 

 430.4 

 491.9 

 553.4 



1 



1.98 

 3.97 

 5.95 

 7.93 

 9.92 

 11.90 

 13.88 

 15.87 

 17.85 



9.92 

 19.84 

 29.75 

 39.67 

 49.58 

 59.' 50 

 69.40 

 79.35 

 89.25 



19.83 

 39.67 

 59.50 

 79.34 

 99.17 

 119.0 

 138.8 

 158.7 

 178.5 



29.75 

 59.50 

 89.25 

 119.01 

 148. 76 

 178. 50 

 208. 20 

 238. 05 

 267. 75 



39. 66 

 79.34 

 119.0 

 158. 68 

 198. 34 

 238.0 

 277. 60 

 317. 40 

 357.0 



55.5 

 111.1 

 166.6 

 222.1 

 277.7 

 333.2 

 388.8 

 444.3 

 499.8 



57.5 

 115.0 

 172.6 

 230.1 

 287.6 

 345. 1 

 402.6 

 460. 2 

 517.7 



59.5 

 119.0 

 178.5 

 238. 

 297.5 

 357.0 

 416.5 

 476.0 

 535.5 



2 .. 



3 



4 



5 



6 



7 



8 



9 





Table 40. — Discharge of water: conversion of second-feet per square mile into runoff 

 in depth in inches over the area 



Second-feet per 

 square mile 









Period in 



days 









1 



5 



10 



15 



28 



29 



30 



31 



1 



0. 03719 

 .07438 

 . 11157 

 . 14876 

 . 18595 

 .22314 

 . 26033 

 .29752 

 . 33471 



0. 18595 

 . 37190 

 . 55785 

 . 74380 

 . 92975 

 1.1157 

 1.3017 

 1. 4876 

 1. 67355 



0. 3719 

 .7438 

 1. 1157 

 1. 4876 

 1. 8595 

 2. 2314 

 2. 6033 



2. 9752 



3. 3471 



0. 5579 

 1. 1157 

 1. 6736 

 2.2314 



2. 7892 

 3. 3471 



3. 9049 

 4. 4628 

 5.0207 



1.041 

 2.083 

 3.124 

 4.165 

 5.207 

 6.248 

 7.289 

 8.331 

 9.372 



1.079 

 2.157 

 3.236 

 4.314 

 5.393 

 6.471 

 7.550 

 8.628 

 9.707 



1.116 

 2.231 

 3.347 

 4.463 

 5.579 

 6.694 

 7.810 

 8.926 

 10. 041 



1.153 

 2.306 

 3.459 

 4.612 

 5.764 

 6.917 

 8.070 

 9.223 

 10. 376 



2 



3 . . 



4 . - 



5 



6 





8 



9 





Table 41. — Inches depth in terms of approximate volume per unit area * 





Cubic 



Cubic 





Cubic 



Cubic 



Inches 



feet per 



yards per 



Inches 



feet per 



yards per 



depth 



acre 



square 

 mile 



depth 



acre 



square 

 mile 



0.01 



36 



860 



0.24 



871 



20, 651 



.02 



73 



1,721 



.25 



908 



21, 511 



.03 



109 



2,581 



.26 



944 



22, 372 



.04 



145 



3,442 



.27 



980 



23,232 



.05 



182 



4,302 



.28 



1,016 



24,092 



.06 



218 



5,163 



.29 



1,053 



24, 953 



.07 



254 



6,023 



.30 



1,089 



25,813 



.08 



290 



6,884 



.33 



1,198 



28, 395 



.09 



327 



7,744 



.35 



1,270 



30,115 



.10 



363 



8,604 



.40 



1,452 



34, 418 



.11 



399 



9, 465 



.45 



1,634 



38, 720 



.12 



436 



10, 325 



.50 



1,815 



43, 022 



.13 



472 



11,186 



.55 



1,996 



47, 324 



.14 



508 



12,046 



.60 



2,178 



51, 627 



.15 



545 



12, 907 



.65 



2,360 • 



55, 929 



.16 



581 



13, 767 



.70 



2,541 



60, 231 



.17 



617 



14, 628 



.75 



2,723 



64, 533 



.18 



653 



15, 488 



.80 



2.904 



68, 836 



.19 



690 



16, 348 



.85 



3,085 



73, 138 



.20 



726 



17, 209 



.90 



3,267 



77, 440 



.21 



762 



18, 069 



.95 



3,449 



81, 742 



.22 



799 



18, 930 



1.00 



3,630 



86, 044 



.23 



835 



19, 790 









1 Inches depth multiplied by 3,630 gives the number of cubic feet per acre to a depth of 1 inch: mulitplied 

 by 86,044.44 gives the number of cubic yards per square mile to a depth of 1 inch. 



