WQ0039488_Modification Attachments_20181017 (13)

Square Tank Buoyancy Calc: Effluent Distribution Tank
Tank Dimensions
Length (Inside)=10.00 ft
Length (Outside)= 11.33 ft
Width (Inside)=10.00 ft
Width (Outside)= 11.33 ft
Height (Inside top to invert)=8.00 ft
Wall Thickness=8.00 in
Thickness of Top=8.00 in
Thickness of Bottom=12.00 in
Depth of Tank Below the Ground =1.83 ft zero if above ground
Height of Tank Out of the ground=0.00 ft zero if below ground
Volume inside of Tank= 800.00 cf
Extended Base =24.00 in
Riser Dimensions
Circular Riser #1 #2 #3 Total
Radius (Inside)=0.00 ft 0.00 ft 0.00 ft
Inside Area= 0.00 sf 0.00 sf 0.00 sf 0.00 sf (total)
Radius (outside)= 0.00 ft 0.00 ft 0.00 ft
Outsied Area= 0.00 sf 0.00 sf 0.00 sf 0.00 sf (total)
Height (Outside)=0.00 ft 0.00 ft 0.00 ft
Wall Thickness=0.00 in 0.00 in 0.00 in
Volume Conc= 0.00 cf 0.00 cf 0.00 cf 0.00 cf (total)
Volume inside of Riser= 0.00 cf 0.00 cf 0.00 cf 0.00 cf (total)
Rectangular Riser #1 #2 #3 Total
Inside Width =4.00 ft 0.00 ft 0.00 ft
Inside Length =6.00 ft 0.00 ft 0.00 ft
Inside Area = 24.00 sf 0.00 sf 0.00 sf 6.00 sf (total)
Outside Width = 4.00 ft 0.00 ft 0.00 ft
Outside Length = 6.00 ft 0.00 ft 0.00 ft
Outsied Area = 24.00 sf 0.00 sf 0.00 sf 24.00 sf (total)
Height (Outside) =1.83 ft 0.00 ft 0.00 ft
Wall Thickness =0.00 in 0.00 in 0.00 in
Volume Conc = 0.00 cf 0.00 cf 0.00 cf 0.00 cf (total)
Volume inside of Riser = 59.92 cf 0.00 cf 0.00 cf 59.92 cf (total)
Concrete Volume
Concrete Vol. of Tank Walls= 227.56 cf
Concrete Vol. of Tank Base= 235.11 cf
Concrete Vol. of Tank Top= 37.63 cf
Concrete Vol. of Riser= 0.00 cf
Total Concrete Vol = 500.30 cf
Soil Volume Above Tank
depth of soil above base = 9.83
Soil volume above extended base = 1,048.53 cf
depth of soil above top tank =1.83
Soil volume above top of tank = 191.13 cf
Total Volume of Soil = 1,239.67 cf
Volume of Water Displaced
Volume of water = 1,360.22 cf
* includes soil area above ext. base & tank top
Unit Weights
Density of Water= 62.40 #/cf
Density of Concrete= 150.00 #/cf
Density of Soil= 95.00 #/cf
Effective Density of Soil= 32.60 #/cf
Downward Forces
Weight
Total Weight of Conc = 75,044.44 lbs
Total Weight of Soil = 40,413.13 lbs
Total Weight =115,457.58 lbs
Sliding Resistnance
R = P*(f)*perimeter = 21,142.79 lbs Slding Resistnace
P = Ka*Usub*(H^2)/2 = 689.44 lbs/ft
Ka = 0.33 Ratio of Lateral to vertical earth pressures
Usub = Us*(1-1/SG) = 35.63 #/cf Effective Unit weight of soil
Us = 95.00 #/cf Unit Weitht of Soil
SG =1.60 Specific Gravity of Soil
H = 10.83 ft Depth of Tank (exterior)
f = 0.50 friction factor (0.5 for ext. base, 0.3 for smooth)
Perimeter = 2L+2W = 61.33 ft Perimeter of extended base or tank bottom
L = 15.33 ft Length of Tank Base
W= 15.33 ft Width of Tank Base
Total Downward Force = 136,600.37 lbs
Buoyancy Force
Total Weight of Water Displaced =84,877.50 lbs
Net Buoyancy Wt.= -51,722.87 lbs Negative number means NOT bouyant!
Factor of Safety =1.61