Design of Septic Tank and Soak Pit - Detailed Procedure Civil Planets PDF

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Design of Septic Tank and Soak Pit - Detailed Procedure | Civil Planets

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Flow Table Test of Concrete Home  Estimation  Design of Septic Tank and Soak Pit – Detailed Procedure Shrinkage of Concrete – Causes & ESTIMATION

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Design of Septic Tank and Soak Pit – Detailed Procedure 5 MINS READ

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A little confusing thing in house construction is a design of septic tank and soak pit households. Now we are going to discuss the septic tank design along with an example.

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Before that just we are going to take a look at the purpose & process of Septic tank. https://civilplanets.com/septic-tank-design-and-soak-pit-design/

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Design of Septic Tank and Soak Pit - Detailed Procedure | Civil Planets

Design of Septic Tank  

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What is M Sand? – Source, Prope A septic tank designed to carry out the liquid waste of the household or community including

human body waste. A septic tank has to be constructed based on the instruction given in IS 2470.

Where does the septic tank require?

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Compaction Factor Test – Proced

Classification Of Aggregates bas Size, Shape, Density & Source

In rural, urban and semi-urban areas where adequate water supply is available from the pipe Flow Table Test of Concrete

but not engaged proper sewer system, hence the septic tank is suitable for disposal of night system those areas.

Shrinkage of Concrete – Causes & Prevention

The septic tank was constructed by the brick wall or RCC wall in the rectangular or circular shape with a minimum of two chambers. A septic tank should be constructed away from the exterior wall of the building and p open to the sky. It not should be installed in the marshy area.

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The function of Septic Tank

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The septic tank was designed to retain the wastes at the minimum period of 24 to 48

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which is received from the households. The wastes retaining period in the septic tank .

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During the period certain biological decomposition by the action of anaerobic bacteria the night soil leaving a small quantity of sludge which is settled down into the tank. The balance https://civilplanets.com/septic-tank-design-and-soak-pit-design/

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Design of Septic Tank and Soak Pit - Detailed Procedure | Civil Planets

surface water runs to the soak pit through the outlet pipe.

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What is meant by Sludge?

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The settled semi-solid waste in the tank is called Sludge. The sludge was Compaction Factor Test – Proced cleaned out from the tank at every 1 or 2 year cycle period. Classification Of Aggregates bas

The septic tank have to be designed and constructed accordingly.

Size, Shape, Density & Source

Flow Table Test of Concrete

Soak Pit or Seepage Pit Shrinkage of Concrete – Causes &

A soak pit is constructed in the natural ground by the dry bricks with open joints in aPrevention circular shape as shown in below picture. The wastewater can easily soak on the ground. The soaking pit should be raised above ground level and the surface water should not enter into the soak pit.

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Design consideration of Soak Pit

Prevention

The diameter of the soak pit shall not be less than 900mm & not less than 1500mm in depth below invert level of the inlet pipe. The absorption area of soak pit could be 1 Sqm to 1.5 Sqm per head of the user.

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The soaking pit covered by the precast slab. Don't miss our next article

Design consideration of Septic Tank Design Your email address..

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Surface and subsoil water should not enter into the tank. The solid waste, paper, napkins should not be flush to avoid the blockages. https://civilplanets.com/septic-tank-design-and-soak-pit-design/

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Design of Septic Tank and Soak Pit - Detailed Procedure | Civil Planets

The kitchen water should not be run in the septic tank.

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The Sludge may clean out in every 1 or 2 years. What is M Sand? – Source, Prope

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Size and Specification

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Compaction Factor Test – Proced

A minimum width of a septic tank is 600mm and depth should be 1225mm including freeboard 300mm from the water level.

Classification Of Aggregates bas

Size,hole Shape, Density & Source A partition wall raised at a distance of half-length of the tank and 150mm x150mm

is made at 450mm height in the wall to connect both chambers. Flow Table Test of Concrete

The septic tank wall thickness should be minimum of 230mm and the floor concrete should be made in M10 or M15 grade of Concrete.

Shrinkage of Concrete – Causes &

Prevention The inner and outer wall should be plastered with the minimum of 15mm thickness

along with the waterproof chemical. The ventilation pipe must be raised 1800mm above the roof.

Let us see an example of septic tank design along with an example.

Septic Tank Design Example Let us estimate the Septic Tank size for a Daily Water Usage for a Home – 10 Person

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1. Cooking – 5 Liters https://civilplanets.com/septic-tank-design-and-soak-pit-design/

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2. Bathing & Toilet – 85 Liters/Person

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3. Washing cloths & Utensils – 30 Liters What is M Sand? – Source, Prope

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4. Cleaning House – 10 Liters

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5. Other – 5 Liters Compaction Factor Test – Proced

Total – Classification Of Aggregates bas Size, Shape, Density & Source

Assume detention period – 48 hours (2 days)

Flow Table Test of Concrete Shrinkage of Concrete – Causes &

So the septic tank should have the capacity to retain the household wastewater at least 2 days.

Prevention

Total wastewater in 2 days – 1350 x 2 = 2700 Liters Let us take 3000 Liters capacity minimum for the house.

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Minimum depth of Septic tank is taken as 1.8m.

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Sludge settled down per person – 30 litres/year and sludge removal once every 2 year So total sludge = 30 liters x 10 persons x 2 years = 600 Liters

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Total tank capacity = 3000+600 = 3600 Liters

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1 Cum = 1000 Liters = 3600/1000 = 3.6 Cum

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Area required @ 1.8m depth = 3.6/1.8 = 2Sqm

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Length & breadth ratio of Septic Tank is 2:1 Compaction Factor Test – Proced

So 2BxB = 2 Sqm where B=1m Classification Of Aggregates bas

Minimum width of the the tank – 750mm

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So that L = 4 x 1 = 4m

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L – 4m

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B – 0.75m Depth – 1.8+0.3 = 2.1m (free board- 300mm)

Prevention

Tank capacity = 4 x 2.1 x1 = 8.4 Cum = 8.4x 1000 =

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Design of Septic Tank and Soak Pit - Detailed Procedure | Civil Planets

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5

1.2

0.6

0.9

650 JOIN

10

1.8

0.6

0.9

970

20

2.5

0.75

1

1880

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30

2.8

0.75 Add additional 300mm Depth for Free Water Board

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POSTS 2500RECENT 84 What is M Sand? – Source, Prope Advantages

Compaction Factor Test – Proced

Septic Tank Size Calculator for Home Add 0.3m in Depth No Of Person

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The field below will show the double of the number above.

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Detention Period in Days 2

Sludge Removal Period in Year

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Total Usage Water in Liters Your email address.. 2325

Water Usage in Cum

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2.325

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Depth in M (Minimum 1.8 M) 1.8

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Breadth in M (Minimum 0.75m) 0.75

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Length in M

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0.8036375634160796

Size, Shape, Density & Source

Capacity of Septic Tank

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1084.9107106117076

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Bala Bala is a Civil Engineer from Chennai who has more than 9+ Years of experience in plan

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costing in Infrastructure. He is the author, editor and partner at Civil Planets.

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Thanaks… be in connect.. Don't miss our next article

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hi there i need calculation details of soakage pit

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