Sample Design Calculations Page 29
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37C
SAMPLE DESIGN CALCULATIONS
APPENDIX
Dry Floodproofing
EXAMPLE C6. SAMPLE CALCULATION FOR SUMP PUMP
Sump Pump Sizing Calculations
Given:
• The drain line is 1.5 in. diameter steel pipe, which is 30 ft long and includes one elbow, one
gate valve, and one check valve (based on hydraulic engineering handbooks)
• Q = the flow rate of the sump pump = 20 gal/min
• V
= Velocity of flow through the pipe in ft/sec
fps
• A
= Area of the discharge pipe cross-section in ft
pipe
• Z = the elevation difference between the bottom of the sump and the point of discharge,
in ft = 10 ft
• h
= head loss due to pipe friction (for this example use 2.92 ft per 100 ft)
f–pipe
• h
= head loss through fittings, in ft
f–fittings
• h
= head loss though transitions, in ft
f–trans
• K
(elbow) = 0.63
b
• K
(gate valve) = 0.15
b
• K
(pipe entrance) = 0.5
e
• K
(sudden enlargement/outlet) = 1.0
o
• g = weight of gravity, 32.2 ft/sec
• TH = total head, in ft
Find:
1. Velocity converted from gal/min to ft/sec
2. Calculate the losses from pipe fittings and pipe transitions
3. Calculate the losses over the length of pipe
4. Calculate the total dynamic head for the sump discharge
Solution for #1: To convert the velocity from gal/min to ft/sec:
C-29
ENGINEERING PRINCIPLES AND PRACTICES for Retrofitting Flood-Prone Residential Structures
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