. Engineering and Contracting. s. for There seemed very few data available on aplant of this kind. Some of the builders ofstandard dredging pumps declared that theproposed heads were excessive and declinedto submit bids on the equipment. A some-what similar plant found working in KansasCity, was carefully studied and much valu-able information gained therefrom. The following was the plant eventually de-cided upon and installed: A floating dredgewas installed in the Mississippi River adja-cent to the sand bar. It was connected to thebank by a pile trestle extending into the rivera distance of 1
. Engineering and Contracting. s. for There seemed very few data available on aplant of this kind. Some of the builders ofstandard dredging pumps declared that theproposed heads were excessive and declinedto submit bids on the equipment. A some-what similar plant found working in KansasCity, was carefully studied and much valu-able information gained therefrom. The following was the plant eventually de-cided upon and installed: A floating dredgewas installed in the Mississippi River adja-cent to the sand bar. It was connected to thebank by a pile trestle extending into the rivera distance of 100 ft. and by a rigid pontoonline 160 ft. long connecting the boat with thetrestle. (Fig. 1.) Articulations at the con-nection of the trestle with the pontoons andof the pontoons with the bow of the boad en-able the suction pipe, located at the stern ofthe boat, to pump sand from any point inthe interior of a semicircle whose radius is380 ft. On the boat was installed a 12-in. centrif-ugal dredging pump of a standard make with. Fig. 1—Map of Portion of Cairo, III., Show Ing Areas Filled by Hydraulic Filling Plant. filling the low streets of the city. This com-pany was originally the Cairo Contracting &Dredging Co., but was later reorganized asthe Cairo Sand & Gravel Co., which companyis now carrying on the work. Regarded as a hydraulic filling propositionsome rather unusual and difficult problemspresented themselves. The extreme distanceto which the material must be pumped over 6,500 ft. and the greatest ele-vation to be overcome at extreme low waterwas about 38 ft. Extreme low water is about6 ft. referred to zero on the government gageat this point and the city grade is 43 ft. re-ferred to the same gage. As it was intendedto use 12-in. pipe and as a velocity of waterof at least 10 ft. per second must be main-tained to keep the heavy sand and gravil insuspension, a total friction and static head ofabout 300 ft. had to be overcome. •Superintendent Cairo Sand &
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