LAND DRAINAGE BY MEANS OF PUMPS. 
27 
It will be noted that the storms occurring in the early spring, when 
the ground is wet and the evaporation is small, have a much larger 
percentage of run-off than those occurring in summer. The monthly 
rainfall and run-off for the above district for the years 1912, 1913, 
and 1914 are given in Table 4. 
Table 4. — Monthly rainjall and run-off , Pekin-La Marsh Levee and Drainage District. 
Month. 
1912 
1913 
1914 
Rainfall. 
Run-off. 
Rainfall. 
Run-off. 
Rainfall. 
Run-off. 
Inches. 
0.00 
1.17 
1.68 
5.50 
4.40 
4.42 
4.07 
2.16 
4.40 
4.09 
1.76 
.81 
Inches. 
0.71 
.58 
1.71 
2.61 
2.61 
1.24 
.79 
.29 
.27 
.68 
1.28 
.64 
Inches. 
1.94 
2.48 
3.07 
2.86 
1.82 
1.59 
1.27 
2.74 
2.30 
2.52 
2.25 
1.21 
Inches. 
1.04 
1.18 
2.85 
14.18 
1.19 
.65 
.19 
.00 
.00 
.10 
.17 
.26 
Inches. 
1.61 
1.61 
1.01 
2.03 
1.90 
1.56 
1.44 
1.95 
5.09 
2.10 
.14 
.41 
Inches. 
0.30 
.36 
1.34 
1.32 
.83 
.17 
July 
.02 
.00 
.18 
.21 
.09 
.06 
Total 
34.46 
13.41 
26.05 
11.81 
20.85 
4.88 
i Large run-off due to flow of water through pump from river during high stage. 
The East Peoria Levee and Drainage District, on the Illinois River 
opposite Peoria, 111., has been pumping since 1911. The plant is 
equipped with one 15-inch and one 18-inch centrifugal pump. The 
combined capacity of the pumps is 33.5 cubic feet per second, or a 
depth of 0.51 inch from the entire watershed of 1,550 acres per 24 
hours. Accurate records were obtainable only for the period from 
September 15, 1913, to September 15, 1914. The weather was very 
dry and no period of pumping occurred which taxed the pumping 
plant seriously. The monthly totals of rainfall and run-off are given 
in Table 5. 
Table 5. — Monthly rain/all and run-off, East Peoria Levee and Drainage District. 
1913. 
1914. 
Total. 
Sept. 
Oct. 
Nov. 
Dec. 
Jan. 
Feb. 
Mar. 
Apr. 
May. 
June. 
July. 
Aug. 
Sept. 
Rainfall 
Run-off 
In. 
2.38 
.04 
In. 
2.81 
.19 
In. 
2.77 
.33 
In. 
0.73 
.38 
In. 
0.21 
.65 
In. 
1.36 
.60 
In. 
1.60 
1.06 
In. 
2.10 
1.34 
In. 
2.29 
1.10 
In. 
1.95 
.64 
In. 
0.85 
.35 
In. 
2.40 
.19 
In. 
3.90 
.13 
In. 
25.35 
7.00 
The largest amount pumped on any one day during the above 
period was a depth of 0.1 inch on April 7, the first day after a rain of 
0.95 inch. The data from this district for 1914 are of no value in the 
general determination of necessary capacity, but they will be used 
later in connection with the cost of pumping. 
The Louisa-Des Moines Drainage District No. 4, about 20 miles 
north of Burlington, Iowa, on the Mississippi River, has been pump- 
ing since 1909. This district has a watershed area of 16,000 acres 
