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:

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 wall-1

The volume of the baffle wall-1

=  [ {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 wall-2

= [ {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 { wall-1+ wall-2}

= {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 wall-1) + (area of  wall-2)]

= 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.

Now, the cost of a septic tank is calculated in table format.

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Conclusion:

Full article on 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. Thank you for the full reading of this article in “The Civil Engineering” platform in English. If you find this post helpful, then help others by sharing it on social media. If any formula of BBS is missing from this article please tell me in comments.