PACKAGE : I Bid Document VOLUME : II - Public Health Engineering

Design shall be based on Criteria for Design of RCC Staging for Overhead Water
Tank as per IS11682-1985 reaffirmed 1998 as well as the provisions of the latest
edition of relevant IS. 456-1978 third revision Amendment-2, I.S. 3370 Part-I & II
of 1965 and Part-3 and Part-4 of 1967, being reaffirmed 1991along with subsequent
amendments, I.S. 875 (1987) Part-I to Part-5, second revision being reaffirmed in
1992 with all up-to-date amendments, I.S. 1893 (1984) Fourth revision amendment-
1 being reaffirmed in 1991 with subsequent amendments if any, I.S. 1904 (1986)
third revision being reaffirmed in 1995 including up-to-date amend if any.
Design Calculation & Drawings.
The design calculation and drawings shall be worked out in metric or S.I. units. The
drawings shall comprise of the following.
General arrangement drawing showing clearly all the elements of the structure and
other appurtenances. The relative levels shall be shown clearly.
Structural drawings showing details of reinforcement of all elements,
Constructions joints, movement joints, Architectural & building drawing Code of
practice etc, confirming to I.S. 962 (1989) Second Revision, I.S. 7973-1976 being
reaffirmed during 1991, I.S. 2502-1963 being reaffirmed during 1990, I.S. 5525-1969
being reaffirmed during 1990 and other relevant I.S. Standards of latest edition with up-todate
amendment shall be furnished. Detailed drawings showing the handrails stainless steel
ladders, fixing of pipes, specials in floor manhole cover etc. shall be furnished.
25.6 Testing for water tightness
For water retaining structures above ground level, the requirement of the test shall
be deemed to be satisfied if the external face shows no sign of leakage and remain
apparently dry over a period of observation of seven days after filling upto
maximum water level and allowing seven days period for absorption.
In case of ground structures with top covered, the tanks shall be deemed to be water
tight if the total drop in water level over a period of seven days does not exceed
40mm.
If the structure does not satisfy the condition of the test period, the test may be
extended for a further period of seven days and if the specified conditions of the test
are satisfied the structures shall be considered to be water tight.
In case of unsatisfactory test results, the contractor shall ascertain the cause, make
all necessary repairs and repeat the procedure until the test has been passed
satisfactory at no extra cost to the employer.
DTS : Detailed Tender Specification. Page 284