IS 2470-1 (1985): Code of practice for installation of ...

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2 $ ' + - Satyanarayan Gangaram Pitroda Invent a New India Using Knowledge 0 1 ' 5 Jawaharlal Nehru Step Out From the Old to the New 1 + , 1 + Mazdoor Kisan Shakti Sangathan The Right to Information, The Right to Live ! > 0 B Bhart hari N ti atakam Knowledge is such a treasure which cannot be stolen Invent a New India Using Knowledge IS 2470-1 (1985): Code of practice for installation ofseptic tanks, Part I: design, criteria and construction[CED 24: Public Health Engineering.]IS : 2470 ( Part 1 ) - 1985 Indian Standard CODE OF practice FOR installation OF SEPTIC TANKS PART I DESIGN CRITERIA AND CONSTRUCTION ( Second Revision ) Third Reprint OCTOBER 1993 UDC 628 352 : 69 001 3 0 Copyright 1986 BUREAU OF INDIAN STANDARDS MANAK BHAVAN.

3 9 BAHADUR SHAH ZAFAR MARO NEW DELHI 110002 Gr 6 January 1986 IS t 2470 ( Part 1 ) n 1985 Indian Standard CODE OF practice FOR installation OF SEPTIC TANKS PART I DESIGN CRITERIA AND CONSTRUCTION ( Second Revision ) Water Supply and Sanitation Sectional Committee, BDC 24 Chairman Refiesenting SHRI J. D CBUZ Water Supply and Sewage Disposal Undertaking, New Delhi Members CHIEF ENGINEER ( CIVIL I ) ( Alrnnote to Shri J. D Cruz ) ADVIYER ( PHE ) Ministry of Works and Homing DEPUTY ADVISES ( PHE ) ( Alternate ) SARI N. S. BHAIRAVAN Public Health Engineering Department Govern- ment of Kerala, Trivandrum SUPEHINTEIDINO ENC+~NE~R ( Alterhate,) SHHI 1. CI~AN~RA Publzlcrprks Department ( Pd;blic Health Government Haryana, Snrtr K.)

4 K. GAX~XIX ( Alfernate ) Chandig)arh CEIEB ENGINEER ( CONSTRUCTION) Uttar Pradesh Jal Nigam, Lucknow SUPENINTENDINQ EyofNEER ( Alternate ) SHRI ClIAUl,31 !tY Sun1 H. V. RAO llternate ) Engineers India Ltd, New Delhi SUW S, K. DASOUPTA Calcutta Metropolitan Development Authority, Calcutta SHKI S. R. MUX. ZRJEE ( Alternate ) Pao~ J. M. DAVE Institution of Engineers ( India ), Calcutta Sunr S. G. DEOLAI~. AU In personal capacity ( Flat .No. 403, Suvitri Cinema Commerical Complex, Greater Kailash -IX, New Delhi ) SHRI B. R. N. GUPTA Ministry of Defence, Engineer-in-Chief s Branch, New Delhi Srmr K. V. KRISHANAYURTI~Y ( riltrrnarc ) ( Conlinud 0s fig0 2 ) @ Copyright 1986 BUREAU OF INDIAN STANDARDS This publication is protected under the Indian CO&right \ \T of 1957 ) and reproduction in whole or in part hy any means except with wrirr!

5 :i 1,ermission of the publisher shall be deemed to bc an infringement of convrieht under the said Act. IS:2470 ( Part I)-1985 ( Continuedfrom page 1 ) Mem6err HYDRAULIC ENaINEEll Representing Municipal Corporation of Grc ater Bombay, Bombay CHIEF ENQIX~ER (SE~ER,\~IZ PROJECTS ) ( Alternale ) SEXI R. A. KI~ANNA Pkblic Health Engineering Department, Govern- ment of Madhva Pradesh. Bhopal SER,I D. K. MITRA ( Alternate I ) SHR I. S. BAWEJA ( Alternate II ) SHRI P. KRIEIIIANAN Central Public Works Department, New Delhi SURVEYOR OF WORKS-~ (NDZ) ( $cm~C ! SH~I M. Y. MADAN e Hmdustan Construction Company Ltd, Bombay SBRI C. E. S. RAO ( Alternate ) SHRI S. L. MAINI Public Works Department (Public Health Branch), Government of Punjab, Patiala SHRI R.)

6 NATARAJAN Hindustan DoIr-Oliver Ltd, Bombay SHRI B. M. RAEUL ( Alternafe ) SHRI K. J. NATE All India Institute of Hygiene and Public Health, Calcutta SHRI D. GUIN ( &rrnlrfe ) SHRI A. PONNABALADS Tarniayr;tu Water Supply & Drainage Board, PROF V. RAXAN National Environmental Engineering Research Institute ( CSIR ), Nagpur SRRI S. R. KY~IRSAQAR ( A&ernnle ) Srrrc~ RANJIT S114oa Ministry of Railways DR A. V. R. RAO National Buildings Organization, New Delhi SARI 0. P. RATRA ( Albmrnfd ) SUXETARY Indian Watrr Works Association. Bombay ~B~I~ETAI<Y GENERAL Institution of Public Health Engineers, India, Calcutta SIIRT R. N. BANERJEE ( Allernate ) SHRI L. R. SEHOAL L. R. Sehgal & Co, New Delhi Snm S.

7 K. SHARMA Central Building Research Institute ( CSIR ), Rootkee SRRI B. N. THYA~ARAJA Bangalore Water Supply and Sewerage Board. Banealore SHRI H. S. PUTTAKEYPANNA ( Alternate ) Srrnl V. VARADARAJAN Madras Metropolitan Water Supply and Sewerage Boaid, Madras SHRI S. DAIVA~ANI ( Alternate ) SHIII G. RAYAN, Director General, IS1 ( Mecmbcr ) Director ( Civ Engg ) Secretary SERI A. K. AVASTHY Assistant Director ( Civ Engg ), IS1 2 IS I 2470 ( Part 1) - 1985 Indian Standard CODE OF practice FOR installation OF SEPTIC TANKS PART I DESIGN CRITERIA AND CONSTRUCTION ( Second Revision ) 0. FOREWORD This Indian Standard ( Part 1 ) ( Second Revision ) was adopted by the Indian Standards Institution on 28 February 1985, after the draft finali- zed by the Water Supply and Sanitation Sectional ComGttee had been approved by the Civil Engineering Division Council.

8 This standard was first printed in 1963 and subsequently revised in 1968 which covered small installation . Large installation septic tanks were given in IS : 2470 ( Part 2 ) which was first printed in 1961 and subse- quently revised in 1971. This revision incorpotxtes the following major changes. Design criteria of septic tank, based on certain assumptions, has been given in detail. Design of inlets and outlets have been modified for the smooth working of the tanks. Arrangements for installing tanks in parallel for the treatment of sewage for population of more than 300 persons have been included. The procedure for the removal of the sludge has been elaborated. This standard covers the design and construction of septic tank for small installations ( up to 20 persons ) as well as large installations.

9 The requirements for secondary treatment and disposal of septic tank efRuent_,have been covered in Part 2 of this Code. The title of the code which was originally Code of practice for design and construction ofseptic tank : Part I Small installations and Part II Large installations , has also been amended to read Code of practice for installation of septic tanks : Part I Design criteria and construction . In unsewered areas, if adequate water supply is available for flushing, treatment of the liquid waste in septic tanks is recommended. 3 IS : 2470 ( Part 1 ) - 1985 This code of practice represents a standard of good practice and therefore takes the form of recommendation.

10 Septic tank offers a preliminary treatment of sewage prior to final dis- posal. Sewage is held in these tanks for some prescribed period during which time the suspended solids present in the storage settle down. The settled sludge and the supernatant liquor undergoes anaerobic digestion. The digestion results in appreciable reduction in the volume of sludge and reduction in organic matter in the liquid. Unsatisfactory design, construction and maintenance of septic tanks constitute a health hazard. It is, therefore, considered essential to lay down minimum standards for guidance of concerned authorities. It is hoped that this code which has been prepared with a view to giving guid- ance on proper design, construction and maintenance of septic tanks, will be found useful by local bodies, public works departments and others engaged in this field.