LAND DRAINAGE BY MEANS OF PUMPS. 
29 
Table 7. — Monthly rainfall and run-off, Louisa-Des Moines Drainage District No. 4. 
Month. 
January . 
February 
March.... 
April 
May 
June 
July 
1912 
1913 
Rain- 
Run- 
Rain- 
Run- 
fall. 
off. 
fall. 
off. 
Inches. 
Inches. 
Inches. 
Inches. 
0.59 
0.00 
1.55 
C 1 ) 
1.24 
.00 
2.06 
C 1 ) 
2.32 
1.27 
3.03 
2.01 
2.73 
6.48 
2.55 
4.05 
3.49 
3.71 
5.35 
2.58 
1.19 
2.07 
3.91 
2.53 
2.98 
.40 
.00 
.95 
Month. 
August 
September. 
October. .. 
November. 
December.. 
Total 
Rain- Run- 
fall, off. 
Inches. 
1.99 
1.86 
5.10 
.99 
1.19 
25.67 
Inches. 
0.56 
.67 
C 1 ) 
C 1 ) 
15.16 
1913 
Rain- 
fall. 
Inches. 
3.29 
1.92 
2.92 
.97 
.61 
28.16 
Run- 
off. 
Inches. 
C 1 ) 
( J ) 
0) 
C 1 ) 
C 1 ) 
12.12 
1 Drainage obtained by use of sluice gates. 
Tables 8, 9, and 10 show the monthly and yearly rainfall at Musca- 
tine, Peoria, and St. Louis. These are chosen, as they are located at 
the corners of a triangle which includes nearly all the area in which 
pumping is required. 
Table 8. — Monthly precipitation, in inches, Muscatine, Iowa. 
Ye 
ar. Jan. 
Feb. 
Mar. 
Apr. 
May. 
June. 
July. 
Aug. 
Sept. 
Oct. 
Nov. 
Dec. 
Annual 
1846 
... 2.80 
4.50 
2.10 
5.40 
3.40 
4.20 
1.30 
0.50 
5.50 
1.30 
1.80 
1.75 
34.55 
1847 
... .79 
1.11 
2.94 
3.30 
3.50 
4.60 
1.20 
3.30 
2.10 
1.21 
3.45 
1.00 
28.50 
1848 
... 1.20 
1.61 
2.31 
.70 
3.40 
2.50 
5.70 
9.10 
3.00 
4.30 
1.85 
3.95 
39.62 
1849 
... 3.15 
1.03 
2.51 
4.70 
4.70 
12.20 
1.40 
12.20 
5.00 
4.80 
6.60 
.87 
59.16 
1850 
... 4.62 
.80 
2.08 
3.32 
3.70 
3.50 
5.00 
13.00 
3.90 
2.70 
3.59 
2.87 
49.08 
1851 
... 1.55 
5.34 
3.03 
3.60 
12.60 
14.30 
8.60 
14.00 
3.50 
1.40 
3. 63 
2.95 
74.50 
1852 
... 2.52 
1.00 
8.60 
5.30 
6.50 
2.20 
3.70 
2.80 
8.30 
7.60 
5.76 
5.11 
59.39 
1853 
.40 
.90 
.90 
11.80 
4.60 
6.40 
6.60 
1.70 
6.20 
.20 
4.90 
.32 
44.92 
1854 
.40 
1.80 
1.23 
1.76 
6.21 
.66 
2.22 
3.33 
1.13 
4.22 
.19 
.51 
23.66 
1855 
... 3.25 
.71 
1.87 
2.55 
1.94 
4.75 
2.35 
3.51 
1.84 
2.81 
2.23 
3.32 
31.13 
1856 
... 1. 22 
5.54 
.61 
3.44 
4.39 
2.68 
2.74 
1.36 
2.45 
5.21 
4.35 
7.95 
41.94 
1857 
.61 
5.80 
3.34 
1.90 
2.75 
.90 
4.67 
6.60 
1.88 
1.95 
2.92 
1.53 
34.85 
1858 
... 1.60 
3.80 
2.20 
5.87 
8.40 
6.67 
7.30 
4.12 
6.10 
4.95 
4.54 
2.90 
58.45 
1859 
.44 
3.89 
5.01 
3.70 
7.49 
5.82 
2.93 
1.70 
1.80 
.85 
1.33 
1.00 
35.96 
1860 
... 1.17 
.43 
.55 
1.67 
1.42 
3.66 
4.03 
2.30 
2.76 
1.00 
2.09 
4.02 
25.10 
1861 
... 1.50 
2.87 
4.50 
3.93 
3.06 
1.72 
2.65 
2.80 
9.30 
7.20 
2.60 
2.10 
44.23 
1862 
... 4.00 
2.50 
9.20 
7.00 
2.65 
6.74 
3.45 
7.25 
4.50 
2.85 
1.32 
1.70 
53.16 
1863 
... 1.70 
1.50 
2.00 
1.52 
1 89 
.91 
.25 
4.15 
2.41 
3.54 
1.44 
5.52 
26.83 
1864 
... 1.05 
.25 
2.59 
3.43 
3.39 
5.75 
3.25 
2.31 
3.20 
3.11 
2.59 
1.85 
32.77 
1865 
.46 
2.90 
2.76 
6.02 
1.05 
3.69 
4.50 
4.25 
4.23 
3.53 
.20 
.62 
34.21 
1866 
... 3.38 
.58 
1.94 
3.91 
1.18 
2.82 
5.18 
3.36 
4.71 
1.94 
1.01 
2.85 
32.86 
1867 
... .75 
3.62 
1.93 
2.34 
5.77 
4.70 
3.24 
1.65 
3.44 
1.00 
2.85 
.95 
32.24 
1868 
.30 
.95 
5.55 
7.43 
7.07 
2.50 
4.59 
2.85 
5.18 
.94 
2.71 
.84 
40.91 
1869 
... 1.62 
1.63 
1.53 
2.64 
4.47 
9.15 
8.55 
5.35 
1.95 
1.59 
2.47 
2.41 
43.30 
1870 
... 2. 04 
.18 
3.37 
.38 
1.86 
.93 
1.05 
4.46 
4.59 
3.95 
.87 
.93 
24.61 
1871 
... 2. 15 
2.09 
1.88 
1.95 
1.93 
6.71 
3.28 
6.12 
1.07 
3.73 
2.30 
2.90 
36.11 
1872 
... .06 
1.30 
2.55 
3.92 
7.57 
5.17 
2.97 
5.84 
4.15 
.84 
1.30 
.74 
35.41 
1873 
... 8.49 
.35 
1.90 
1.45 
4.31 
1.91 
2.61 
1.30 
1.44 
1.18 
3.49 
28.43 
1874 
... 4.72 
2.88 
2.39 
2.93 
1.51 
3.70 
2.26 
'"3.'54* 
6.58 
.90 
2.49 
.88 
34.78 
1875 
.65 
1.50 
1.99 
.90 
2.65 
4.97 
6.72 
2.56 
9.38 
1.27 
.63 
4.37 
37.59 
1876 
... 3.23 
2.85 
3.54 
4.00 
7.38 
4.45 
9.15 
5.72 
6.53 
1.84 
3.48 
1.40 
53.57 
1877 
... 1.58 
2.00 
4.28 
3.57 
2.25 
7.44 
4.82 
4.49 
1.25 
6.03 
3.06 
3.01 
43.78 
1878 
... .40 
1.56 
2.87 
2.36 
7.49 
4.09 
3.57 
7.43 
2.81 
4.35 
.77 
1.60 
39.30 
1879 
... 1.20 
1.07 
2.18 
1.81 
4.54 
3.78 
3.40 
4.56 
2.37 
2.85 
4.65 
1.42 
33. 83 
1880 
... 3.02 
1.63 
3.62 
3.02 
3.25 
7.22 
3.84 
4.48 
3.17 
.25 
.97 
1.31 
35.78 
1881 
... 1.34 
3.49 
2.58 
2.11 
2.43 
10.38 
3.77 
1.36 
6.59 
7.03 
2.83 
1.75 
45.66 
1882 
.84 
1.10 
2.98 
4.00 
8.36 
8.25 
4.55 
1.75 
1.38 
4.29 
7.15 
2.02 
46.67 
1883 
... 1.66 
4.67 
.75 
5.00 
6.19 
4.77 
4.31 
1.45 
1.19 
6.23 
3.45 
1.45 
41.12 
1884 
... 1.05 
1.40 
4.28 
2.08 
5.57 
4.03 
3.63 
5.77 
5.23 
6.46 
1.57 
4.42 
45.49 
1885 
... 2.38 
2.21 
1.25 
14.00 
4.18 
4.81 
5.03 
7.38 
2.88 
2.80 
.83 
2.32 
39.07 
1886 
... 4.21 
1.43 
4.16 
2.62 
5.05 
U.30 
.32 
2.62 
3.05 
4.70 
.95 
.71 
31.12 
1887 
... 1.88 
4.12 
1.14 
1.26 
2.26 
2.10 
2.90 
2.40 
3.49 
2.24 
.98 
3.53 
28.30 
1888 
... 1.49 
.70 
3.10 
11.60 
6.78 
3.82 
3.39 
7.24 
2.00 
1.50 
4.43 
2.84 
38.89 
1889 
... 1.43 
1.38 
.65 
4.28 
4.17 
5.68 
6.69 
1.15 
3.95 
1.04 
1.65 
1.40 
33. 47 
1890 
... 1.90 
1.70 
3.29 
1.12 
3.61 
6.68 
1.88 
2.35 
2.52 
4.24 
1.38 
1.20 
31.87 
1891 
.... 1.75 
2.19 
3.50 
13.10 
2.51 
4.87 
3.29 
5.20 
1.35 
1.49 
13.50 
2.51 
35.26 
1892 
.... 1.35 
1.08 
3.90 
4.31 
10.32 
8.83 
3.85 
1.70 
.47 
.82 
2.21 
2.56 
42.30 
1893 
.... 1.35 
1.60 
3.49 
5.33 
2.35 
3.61 
2.59 
1.02 
5.05 
1.14 
2.40 
1.27 
31.20 
1894 
1.80 
1.25 
2.44 
5.33 
2.05 
2.04 
.24 
2.74 
5.85 
2.10 
2.99 
.76 
29.59 
1895 
.... 1.83 
.84 
1.75 
.83 
3.05 
.98 
7.82 
4.22 
2.12 
1.02 
2.12 
2.62 
29.20 
1896 
.... 1.10 
1.18 
1.32 
5.72 
5.21 
2.02 
5.59 
4.43 
3.63 
1.89 
1.09 
1.27 
34.45 
1897 
... 5.46 
2.72 
2.80 
5.23 
1.59 
2.54 
3.51 
1.21 
2.50 
.78 
2.07 
1.94 
32.35 
1898 
... 3.33 
1.72 
3.64 
3.74 
5.30 
3.34 
.73 
6.22 
2.34 
3.74 
1.76 
.51 
36.37 
1 Values taken from surrounding stations. 
