LA V ND DRAINAGE BY MEANS OF PUMPS. 
25 
for 12 hours. The approximate run-off would be estimated for the 
first three days of pumping as a total of 0.38 inch. May, 1910, was 
a particularly wet month at this station; the total precipitation was 
5.8 inches, though there were no single remarkably heavy showers. 
On the first two days of the month 1.4 inches fell; on the 7th, 1.4 
inches; on the 11th, 1.2 inches, and from the 15th to the 17th 0.8 
inch. To meet this steady wet period all three pumps were run 
continuously for 72 hours from the 13th to the 15th, and again for 
42 hours on the 18th and 19th. The estimated amount pumped in 
each period would be 0.42 inch for the first and 0.35 inch for the 
second. During this month the plant was operated at full capacity 
for 70 per cent of the time, removing a total estimated depth of 3.04 
inches of water from the district. In the period from July 1, 1909, 
to July 1, 1910, the estimated total amount pumped was 20 inches. 
During the latter part of 1913 the above-described plant Was 
replaced with a new one, equipped with three 20-inch centrifugal 
pumps having a combined capacity of 87.5 cubic feet per second, 
or a depth of 0.28 inch on the entire district per 24 hours. After 
installation these pumps were carefully rated at the various heads 
and accurate records were kept for the year 1914. The year was 
unusually dry, and only one storm period -of any consequence 
occurred during the entire year. The rainfall and amount pumped 
for this storm period are shown in Table 1. 
Table 1. — Daily rainfall and run-off, Coal Creek Levee and Drainage District, March 25- 
April 11, 1914. 
Day. 
Rainfall. 
Run-off. 
Day. 
Rainfall. 
Run-off. 
Day. 
Rainfall. 
Run-off. 
Mar. 25 
26 
27 
28 
29 
30 
31 
Inch. 
0.25 
.00 
.75 
.25 
1.00 
.00 
.00 
Inch. 
0.06 
.05 
.07 
.10 
.24 
.14 
.16 
Apr. 1 
2 
3 
4 . 
5 
6 
7 
Inch. 
0.32 
.00 
.00 
.00 
.00 
.00 
1.00 
Inch. 
0.10 
.12 
.12 
.12 
.10 
.10 
.14 
Apr. 8 
9 
10 
11 
Total.. 
Inches. 
0.00 
.00 
.00 
.00 
Inches. 
0.15 
.12 
.11 
.10 
3.57 
2.10 
Data for the above district for the year 1914 are shown in Table 2. 
Table 2. — Monthly rainfall and run-off, Coal Creek Levee and Drainage District, 1914. 
Jan. 
Feb. 
Mar. 
Apr. 
May. 
June. 
July. 
Aug. 
Sept. 
Oct. 
Nov. 
Dec 
Total. 
In. 
In. 
In. 
In. 
In. 
In. 
In. 
In. 
In. 
In. 
In. 
In. 
In. 
Rainfall 
3.11 
2.50 
2.25 
1.70 
1.88 
2.00 
2.01 
2.41 
3.88 
1.89 
0.00 
1.87 
25.50 
Run-oft 
.62 
.78 
2.60 
2.65 
1.10 
.76 
.40 
.12 
.48 
.47 
.49 
.52 
10.99 
During the history of its pumping, extending over about 25 years, 
the Pekin-La Marsh Levee and Drainage District, near Pekin, 111., 
has had several different pumping plants, but at the end of 1914 it 
had the following equipment: One 26-inch centrifugal pump with an 
5393°— Bull. 304—15 4 
