Appendix F 



Booster Pump Worksheet 



Great Lakes Dredge & Dock (GLDD) in Oakbrook, IL, was contacted for assistance in 

 determining the number of booster pumps required for the semifixed plant alternative. The 

 assumptions and their source or rationale are summarized as follows: 



a. Assume sediment d 50 =0.4 mm and d 85 =0.8 mm from GLDD database for Shinnecock and 

 Table 4. 



b. Assume a pumping distance of 2,700 m (8,800 ft). 



c. Assume a 12-in.-diam discharge line similar to what is used at Indian River Inlet. 



d. Assume solids SG=2.65, slurry SG=1.15, in situ SG=1.90 (GLDD). 



GLDD calculated a maximum critical velocity V c = 10.1 ft/sec for d 50 = 0.4 mm in a 12-in. 

 pipe. To prevent settling, the pipeline velocity V should not be less than V c . Therefore, for 

 calculation purposes and conservativeness, let V = 1 1.5 fps. 



Flow rate: 



Q = VA 

 I 



Q = V 



« J2 



d' 



(Fl) 



Q - ILS^jay 



Q = 9.03 cfs = 4,053 gpm = 1,204 cyh 



Appendix F Booster Pump Worksheet F1 



