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EXISTING INTAKE NORTH PORTAL FLOW CALCULATIONS The original calculations by Stover assume the siphon is broken but that the pipe junction between the two fl- inch intake pipes and the 6-inch discharge pipe is unvented. REACH 1 -from mine to Manhole Pipe length 225 ft From Stover Equivalent length of 3 sweep elbows 21 ft From Stover Not included by Stover but it must be there if the Equivalent length of tee 22 ft. system goes from two 4" to one 6" Approximate equivalent length of short Not included by Stover but it must be similar if section of combined 4" plus increaser 15 ft. the system goes from 4" to 6" Total length 283 ft. Maximum allowable Pool Elevation 4764 ft From Stover but is it really a limiting value? Water Surface at NW Intake Portal 4762 ft From Stover Maximum Available Head 2 ft. be 350 then it needs to be 350 for backup system. 1/2 of 350 is 175. Stover used only Maximum Discharge 175 gpm 100 each. Pipe Size 4 in Pipe Inside Area 0.09 sf Velocity 4.47 fps Velocity Head 0.31 ft Entrance Loss -protruding - .8 VH 0.25 ft Exit Loss 0.00 ft No Exit loss since it continues into reach 2. Hazen Williams C -PVC 130 Friction Loss per 100 ft 2.1291 ft Friction Loss 6.03 ft for 283' Total Loss 6.27 ft Maximum head is greater than "maximum Predicted Water Surface in mine 4768.27 allowable" by 4.27'. REACH 2 -from Manhole to outfall Pipe length 550 ft From Stover Equivalent length of meter 30 ft From Stover Equivalent length of gate valve 3.5 ft Existing throttling valve assumed full open Equivalent length of 3 bends 48 ft Stover has 2 but it must be at least 3 maybe 4 Total length 631.5 ft. Water Surface at NW Intake Portal 4762 ft From Stover Water Surface at Discharge Point 4740 ft From Stover Maximum Available Head 22 ft. Required Discharge 350 gpm Pipe Size 6 in Pipe Inside Area 0.20 sf