Soak pit Construction Coast

  


What is Soak pit

The effluent is allowed to be soaked or absorbed into the surrounding soil. soak pit is field with gravel brick bats.

Item of soak pit

  • Brick work
  • Rcc hume pipe 
  • Brick bad
  • Excavation and back filling 

Sl no

Description

Unit

Quantity

Rate

Amount

1

Honey comb brick work

Cum

3.495

8000

27960

2

Rcc Hume pipe

Meter

2.5

1000

2500

3

Brick bad

Cum

11.36

4000

45440

4

Excavation and back filling

Cum

21

250

5200

 with labor and material coast =81,100/-


why construction soak pit

Disposal of effluents form septic tank :-The effluent of septic tank will have Biochemical oxygen demand (BOD) of 100 to 200 mg/L and hence it can not be disposed of into water coarse

Method of septic tank effluent disposal 

  • Soak pit
  • Absorption trenches 
  • Leaching cess pool
Design of soak pit with example 
  1. Design a septic tank for following data :number of people is 100, sewage/capita/day is 10 liter, De-sludging period is 1 year and L:B is 4:1, detention time is 36 hours, sludge accumulation rate is 30 rate is 30 liter/person /year, depth of tank 3m. What will be volume of soak well if the effluents are to be discharged in it. Assume percolating capacity as 1250 liter/cum/day

Solution: sewage follow rate A=100=12000 liter/day=12 cum/hours =0.5 cum/hours 
Dt=36 hours 
sludge accumulation rate ,QsL=100 x 30=3000 liter/year = 3 cum/year
Tc=1 year
Volume (V)= Q
=0.5 x 36 + 3=21 cum
V= AD= L x B x D
21= 4B x B x 3
B=1.3 meter
L= 5.2 mete 
Volume of soak pit required = Q/allowable loading rate =12000/1250=9.6 cum

Note

  • The rate of sludge accumulation in septic tank is generally of the order of 30 liter/person/year 
  • Effluents should be disposed off either for sub surface irrigation or soak pit in trickling filter before disposed of water coarse 
  • beside soak pit there is no well nearby




Comments

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