TESTS OF DRAINAGE PUMPING PLANTS. 
41 
had some effect upon the efficiency of the pump, and consequently re- 
duced the over-all efficiency. The eddy was caused by unequal 
depths of water below the suction pipes and by the higher velocity 
near the center line of the suction canal. 
RESULTS OF TEST. 
The test, which extended over a period of nearly six hours, was run 
with a varying difference of levels in the canals, the lift increasing 
from 3.55 feet at the beginning of the run to 4.96 feet at the close. 
The speed of the pump was held uniform at 195 revolutions per 
minute, but the total water pumped varied with the change in actual 
lift, ranging from 60,050 gallons per minute at the lower lift (3.55 
feet) to 54,700 gallons per minute at the higher lift (4.96 feet). The 
results obtained are given in Table 35. 
The economy of the plant can best be realized by a comparison 
with the steam pumping plant in subdistrict No. 1, Gueydan drainage 
district, where the equipment consists of high-grade simple noncon- 
densing Corliss engines and volute pumps. When pumping against a 
head of approximately 5 feet the fuel consumption of the steam plant 
was to that of the internal-combustion engine plant as 4.28 to 1 for 
equal output of work. 
12, Raceland, La. 
Feb. 21 
, 1916. 
Time. 
Speed. 
Actual 
lift. 
Discharge. 
Useful 
water 
horsc- 
X>owcr. 
9. 40 
R.p.m. 
195 
196 
195 
195 
195 
195 
195 
195 
195 
195 
• 195 
195 
195 
195 
195 
195 
195 
195 
Feel. 
Sec. -ft. 
G.p.m. 
10.00 
3.55 
3.63 
3.69 
3.75 
3.82 
3.90 
3.98 
4.08 
4.17 
■1. 27 
4.34 
4.43 
4.52 
4.63 
4.74 
4.84 
4.96 
133. SO 
132. 79 
131. 57 
131. 23 
128. 23 
128. 89 
129. 90 
126.22 
126. 78 
128.67 
125. 00 
• 124. 66 
126.00 
125.55 
■ 123.88 
123. 32 
121.88 
60.050 
59, 600 
59, 050 
58,900 
57. 550 
57, 850 
58, 300 
56, 650 
56, 900 
57. 750 
56. 100 
55, 950 
56. 550 
56, 350 
55,600 
55. 350 
54, 700 
53.80 
10.20... 
54 70 
10. 40 
55.00 
11.00 
11.20 
11.40 
12. 00 
1 2. 20 
12. 40 
55. 80 
55.50 
56.95 
58. 60 
58. 40 
59 90 
i.oo : 
1. 20 
1.40 
2.00 
62. 25 
61.50 
62.55 
64 55 
2. 20 
65.90 
2.40 
66 50 
3.00 
67 60 
3.20 
68 50 
TEST OF DRAINAGE PUMPING PLANT OF LITTLE WOODS TRACT, NEW ORLEANS, LA. 
DESCRIPTION OF PLANT. 
The New Orleans Lake Shore Land Co. has reclaimed an area of 
6,943 acres of prairie land, located on Lake Pontchar train, inside the 
city limits of New Orleans. The pumping plant was erected during 
the latter part of 1913. (See PI. II.) It consists of two centrifugal 
pumps, each with a discharge opening equivalent to a circle of 51 f 
inches diameter, connected by means of herringbone gears to 'electric 
