LAND DRAINAGE BY MEANS OF PUMPS. 



25 



for 12 hours. The approximate rim-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 da3 r s 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 rainjall and run-off, Coal Creek Levee and Drainage District, March 25- 



April 11, 1914. 



Day. 



Rainfall. 



Run-off. 





Inch. 



Inch. 



Mar. 25 



0.25 



0.06 



26 



.00 



.05 



27 



.75 



.07 



28 



.25 



.10 



29 



1.00 



.24 



30 



.00 



.14 



31 



.00 



.16 



Day. 



Rainfall. 



Run-off. 





Inch. 



Inch. 



Apr. 1 



0.32 



0.10 



2 



.00 



.12 



3 



.00 



.12 



4 



.00 



.12 



5 



.00 



.10 



6 



.00 



.10 



7 



1.00 



.14 



Day. 



Apr. 8 



9 



10 



11 



Total 



Inches. 



0.00 



.00 



.00 



.00 



3.57 



Run-off. 



Inches, 



0.15 



.12 



.11 



.10 



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. 



.1,2 



In. 

 2. SO 



.78 



In. 

 v.. 25 

 2.60 



In. 

 1.70 



2. <i;> 



In. 



1.88 

 1.10 



In. 



2.00 



.76 



In. 

 2.01 



.40 



In. 



2.41 



.12 



In. 



3.88 

 .48 



In. 

 1.89 



.47 



In. 



0.00 



.49 



In. 

 1.87 

 .52 



In. 

 25. 50 

 10.99 







During the history of its pumping, extending over about 25 years, 



the Pekin-La Marsh Levee and Drainage District, near Pekin, 111., 



ha had i reral different pumping plants, but at the end of 1914 it 



hud the following equipment: One 20-inch centrifugal pump with an 



5393°— Bull. :J01— L5 4 



