How to Prepare Cost Estimate of Septic Tank  Quantity of Septic Tank
In this Article today we will talk about the How to Prepare Cost Estimate of Septic Tank  Quantity of Septic Tank  Estimate of Septic Tank  Septic Tank Calculator  How to Calculate the Cost of Septic Tank  Septic Tank Estimate Excel  Concrete Septic Tank Cost  Excavation of Septic Tank  Brickwork in Septic Tank
How to Prepare Cost Estimate of Septic Tank:
Before starting this estimate you must read this article: How to Calculate the Size and Capacity of Septic Tank  Formula
Septic Tank Detail:
Septic Tank Items:
 Earth Work Excavation
 Filling Quantity of Septic Tank
 P.C.C
 Reinforced Concrete Work
 Reinforcement
 Brick Work – 230mm:
 Plastering Septic Tank Calculator
 Manhole
How To Prepare Cost Estimate of Septic Tank:
Description:
Reinforced Concrete Work:
Reinforcement:
Centering and Shuttering work:
Earthwork:
How To Prepare Cost Estimate of Septic Tank:
P.C.C:
Sand Filling:
How To Calculate the Cost of Septic Tank?
Let us estimate the brick masonry septic tank as shown below.
1. Excavation:
Volume of excavation
= [length × breadth × depth]
Here, the length & breadth of excavation is the same as that of PCC.
= [ 11ft. × 7.5ft. × 6.75ft.]
= 556.88 cu ft.
2. PCC:
Given data:
The extra length of PCC on all 4 sides of the septic tank is 6″ (0.5ft.)
Length = 11ft.
Breadth = 7.5ft.
Thickness= 5″ = 0.416 ft.
(As 1ft. = 12 inches)
Brickwork in Septic Tank
Volume of PCC:
= [length × breadth × thickness]
= [ 11ft. × 7.5ft. × 0.416ft.]
= 34.32 cu ft.
3. Brick masonry:
a. 9″ thick outer wall:
Given data:
Length = 10ft.
Width = 9″ = 0.75 ft.
(As 1ft. = 12 inches)
Height = 6ft.
Let us find the vol. of brick masonry by the longwall short wall method.
The volume of the longwall:
= [2nos.×( length × width × height)]
= [2nos. × ( 10 ft. × 0.75 ft. × 6 ft.)]
= [ 2nos. × 45 cu ft.]
= 90 cu ft.
The volume of the short wall:
= 2nos. × [{ length} × width × height]
= 2nos. × [{6.5 ft. (2nos.× 0.75 ft.)} × 0.75 ft. × 6 ft.]
= 2nos. × [{5 ft.} × 0.75 ft. × 6 ft.]
= 2nos. × [ 22.5 cu ft.]
= 45 cu ft.
The total volume of 9″ thk. brick wall
= the volume of { longwall + short wall}
= {90 cu ft. + 45 cu ft.}
= 135 cu ft.
b. 4″ thick inner partition walls:
Baffle wall1
The volume of the baffle wall1
= [ {length} × width × (height)]
= [{ 6.5 ft. (2nos.× 0.75 ft.)} × 0.33 ft. × (6 ft. – 1.5 ft.)]
= [{5 ft.} × 0.33 ft. × (4.5 ft.)]
= 7.425 cu ft.
The volume of wall2
= [ {length} × width × height]
= [{6.5 ft. (2nos.× 0.75 ft.)} × 0.33 ft. × 6 ft.]
= [{5 ft.} × 0.33 ft. × 6 ft.]
= 9.90 cu ft.
The total volume of 4″ thk. brick wall
= the volume of { wall1+ wall2}
= {7.425 cu ft. + 9.9 cu ft.}
= 17.33 cu ft.
4. Plastering:
a. For 9″ brick wall:
Area of plastering
= 2nos. × [ (area of a longwall) + (area of a short wall)]
= 2nos. × [ (10ft. × 6ft.) + (5ft. × 6ft.)]
= 2nos. × [ 60 sq ft. + 30 sq ft.]
= 180 sq ft.
Note: Length & height of the longwall & short walls are taken for area calculation.
b. For 4″ inner wall
Area of plastering
= 2 sides. × [ (area of wall1) + (area of wall2)]
= 2 sides × [ ( 5ft. × 4.5ft.) + ( 5ft. × 6ft.)]
= 2 sides × [ 22.5 sq ft. + 30 sq ft.]
= 105 sq ft.
c. For floor base
Floor area plastering
= [ {length} × { breadth.}]
= [{10 ft. – (2nos. × 0.75ft.)} × {6.5ft. – (2nos. × 0.75ft.)}]
= [ {10ft. – 1.5 ft.} × { 6.5ft. – 1.5ft.}]
= [8.5ft. × 5ft.]
= 42.5 sq ft.
Total plastering area
= plastering area of [ 9″ wall + 4″ wall + floor]
= [180 sq ft. + 105sq ft. + 42.5 sq ft.]
= 327.5 sq ft.
5. RCC slab:
The area of the RCC slab
= [length × breadth ]
= [ 10ft. × 6.5 ft.]
= 65.0 sq ft.
6. Miscellaneous:
Inlet & outlet pipe of 4″ dia = 2 nos.
Manhole cover with frame = 1no.
Vent pipe = 1no.
Let us calculate the cost of a brick masonry septic tank as shown below.
Estimation and Rate Analysis of a Septic Tank:
Here, we will estimate the septic tank in sheet format as given below.
Sl. No.  Description  Nos.  Length in ft.  Breadth in ft.  Depth in ft.  Qty.  Total Qty. in c ft/sq ft. 
1.  Earthwork Excavation  1  11  7.5  6.75  556.88  556.88 
2.  M20 grade PCC  1  11  7.5  0.416  34.32  34.32 
3.  9″ brick masonry in 1:6 CM.  
3a.  Long wall  2  10  0.75  6.0  45  90 
3b.  Short wall  2  5  0.75  6.0  22.5  45 
Total volume of 9″ brick masonry  135.0  
4.  4″ brick masonry in 1:5 CM.  
4a.  Baffle wall1  1  5  0.33  4.5  7.425  7.425 
4b.  Wall2  1  5  0.33  6.0  9.90  9.90 
Total volume of 4″ brick masonry  17.33  
5.  12mm thick Plastering in 1:4CM  
5a.  9″ long wall  2  10  ——  6.0  60  120 
5b.  9″ short wall  2  5  ——  6.0  30  60 
5c.  4″ baffle wall1 (on 2 sides)  2  5  ——  4.5  22.5  45 
5d.  4″ wall2 (on 2 sides)  2  5  ——  6.0  30.0  60 
5e.  Floor area.  1  8.5  5.0  —–  42.5  42.5 
Total area of plastering  327.50  
6.  RCC slab in M25 grade concrete  1  10  6.5  —–  65  65 
7.  Manhole cover & frame of 2ft × 2ft size.  1 no.  
8.  Vent. pipe  1 no.  
9.  4″ dia. inlet & outlet pipe  2 nos. 
Now, the cost of a septic tank is calculated in table format.
Sl. no.  Item.  Qty.  Rate. in INR.  Unit.  Cost in INR. 
1.  Excavation  556.99  11/  Cu ft.  6,126.89 
2.  PCC  34.32  207.15/  Cu ft.  7,109.39 
3.  9″ brick masonry.  135  159.52/  Cu ft.  21,535.20 
4.  4″ brick masonry.  17.33  174.17/  Cu ft.  3,018.37 
5.  Plastering.  327.5  18.10/  Sq ft.  5,927.75 
6.  RCC slab  65  210/  Sq ft.  13,650.00 
7.  Man hole.  1  1800/  No  1,800.00 
8.  Vent pipe.  1  450/  No  450.00 
9.  Inlet & outlet pipe.  2  350/  No  700.00 
6.  The cost of septic tank =  60,317.40  
7.  Add 12% for contractors profit =  7,238.09  
10.  The total cost of septic tank =  67,555.49 
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Conclusion:
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11 Comments
Very good
Thanks for comment
Why you did not put Peebles sand and charcoal
after the leaching so that water coming out from the last one will be very clean
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My name is kaleb Belihu Alemu i m Construction Technology and management Engineer so i’m interested gother information from this page
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Sir plz give cost estimate for swimming pool also LBH 18m,10m,1.52m
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This is an interesting prepare bcost Estimate once have to go through
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