- 39 - 



IX. AUXILIARY PUMPING SYSIEMS 



The scaled quantities of bleed water were pumped through 

 l/8-inch copper tubes embedded in the plaster monolith. These 

 tubes were terminated at point VI on the north bank of Humble 

 Canal, point VIII on the 'west bank of the dredge cut, at the 

 head of the dilution canal and on the shore of Lake Grande 

 Ecaille adjacent to the head of the dilution canal (see fig* 

 14). The first three tubes were attached to a positive displace- 

 ment pump driven by an electric motor through suitable screw. 

 The fourth tube was used to withdraw the dilution volumes from 

 Lake Grande Ecaille for return at the head of the dilution canal 

 together with the appropriate volumes of simulated bleed water. 

 Thus the hydraulic activities of the Freeport Svilphur Company 

 mining operations having significance in these tests were sub- 

 stantially reproduced in the model. 



The kinematic scaling factor of discharge Qj. being 1/5.3 3C 

 10' per mean solar day, the discharge per mean solar minute into 

 the model is (^ = QpT^. or 1/7.68 x 10 . One million gallons in 

 the prototype is therefore represented in the model by a volume 

 of 0.05 cubic centimeter of liquid or approximately one drop. 

 Pumps that will deliver such small quantities of liquid per min- 

 ute are difficult to build and to operate. In order to increase 

 the volumes to be discharged by a single pumping tmit, and to 

 simplify the maintenance of predetermined differences of 



