Table 22. Discharge Rates for Hydraulic Dredge 

 Pipelines (Source: Reference 39) 



Pipeline Discharge Rate (for Flow Velocity 



Diameter of 12 ft/sec)^ 



(in) (cu ft/sec) (gal/min) 



8 4.2 1,880 



10 6.5 2,910 



12 9.4 4,220 



14 12.8 5,750 



16 16.5 7,400 



18 21.2 9,510 



20 26.2 11,740 



24 37.7 16,890 



27 47.6 21,300 



28 51.3 23,000 

 30 58.9 26,400 

 36 84.9 38,000 



^To obtain discharge rates for other velocities multiply 

 the discharge rate in this table by the velocity (ft/sec) 

 and divide by 12. 



Use of Existing Areas : Many old spoil banks remain in coastal areas. 

 These spoil areas have caused considerable damage in the past but novy the 

 material has compacted or eroded away. Further spoil disposal in these 

 areas should not significantly increase the loss of vital habitats; how- 

 ever, harmful impacts from new dredging should be kept to a minimum. 



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