Specifications Part 1 - Water Supply, Sewerage and Tube Well Works

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14.3.5.4.3 (c) By drop in previous successive manholes instead of providing the total droprequire at the junction manholes, the same may be achieved by giving smallerdeeps in successive manhole preceding the junction manhole. Thus, forexample, if a total drop of 2.4m is required to be given, 0.6m drop maybe givenin each of the previous three manholes and the last 0.6m-drop maybe given atthe junction manhole.14.3.6. Scraper (Service) Type Manhole: -All sewers above 450mm diameter should have manhole at intervals for 110 to120 m of scraper type. This manhole should have clear opening of 1200 X 900mm at top to facilitate lowering of buckets.14.3.7. Flushing manholes14.3.7.1 Where it is not possible to obtain self-cleaning velocities due to flatness of thegradient specially at the top end of branch sewer which receive very little flow,it is essential that same form of flushing device be incorporated in the system.14.3.7.2 This can be done by making grooves at intervals of 45 to 50m in the maindrains in which wooden planks are inserted & water allow to head up which willrush on with great velocity when the planks are removed.14.3.7.3 Alternatively, an overhead water tanks is built, from which connection aremade through pipe flushing hydrants to rush water to the sewer. The relevantIndian standard IS: 4111(part two).Flushing can be very convenientlyaccomplished by use of fire hydrant or tanker.14.3.7.4 Where flushing manhole is provided, they are located generally at the head of asewer. Sufficient velocity shall be imparted in the sewer to wash away thedeposited solid. The flush is usually effective up to a certain distance afterwhich the imparted velocity gets dissipated.14.3.7.5 The automatic systems which are operated by mechanical units gets oftencorroded by the sewer gases and do not generally function satisfactorily andhence are not recommended. Care should be exercised to be ensuring thatthere is no possibility of back flow of sewer into the water supply mains.14.4 Constructional Details: -Manhole is usually constructed directly over the centre line of the sewer theyare usually constructed with brickwork. However in areas where sewers are tobe laid in high water condition manhole shall be constructed in R.C.C. They arecircular, rectangular or square in shape. Manholes should be of such size aswill allow necessary cleaning and inspection of manholes.14.4.1 Rectangular Manholes - The minimum internal sizes of rectangular manholesbetween brick face should be as follows:14.4.1.1 For depth of manholes less than 0.9m, 900mm x 800mm14.4.1.2 For depths of manholes from 0.9m and up to 2.5m, 1200mm x 900mmUrban Administration & Development Department Page 162
14.4.2 Arch type manholes - For depth of 2.5m and above, arch type manholes can beprovided and the internal size of the chambers between brick faces shall be1400mm x 900mm. The width of manhole chamber on bends and junction ofpipes with diameter greater than 450mm should be suitably increased to900mm or more so that benching width on either side of the channel at-least200mm.14.5 Circular manholes -14.5.1 Circular manholes are longer than rectangular and arch type manhole and thusthey are preferred over rectangular as well as arch type manholes. The circularmanholes can be provided for all depths starting from 0.9m circular manholesare straight down in lower portion and slanting in top portion so as to narrowdown the top opening equal to internal dia. of manhole over.14.5.2 Depending upon the depth of manhole, the diameter of manhole changes. Theinternal diameter of circular manholes may be kept as following for verifyingdepths.14.5.2.1 For depths 0.9m and up to 1.65mm, 900mm diameter.14.5.2.2 For depths above 1.65m and up to 2.30m, 1200mm diameter.14.9.2.3 For depths above 2.30m and up to 9.0m, 1500mm diameter.14.5.2.4 For depths above 9.0m and up to 14.0m, 1800mm diameter.(See drawings at the ends of the specification.)14.5.3 If the sewer is constructed in a tunnel, the manhole should be located at theaccess or working shaft and the manhole chamber maybe constructed of a sizeto suit the working shaft or vice-versa.14.5.3.1 The width/diameter of the manhole should not be less than internal diameter ofthe sewer +150mm benching at both sides (150mm + 150mm) The opening forentry into the manhole (without cover) should be such minimum diameters asto allow a workman with the cleaning equipments into the interior of themanhole without difficulty. A minimum clear opening of 60cm preferably circularis recommended. Suitable steps usually cast iron shall be provided for entry.14.5.3.2 Access shaft for large sewers - Access shaft shall be circular in shape andshall have a minimum internal dia of 750mm, where the depth of the shaftexceeds 3m suitable dimensions shall be provided to facilitate cleaning andmaintenance.14.5.3.3 Access shaft where built of brick work should be carvel led on three sides toreduce it to the size of the opening in the cover frame and to provide easyaccess on the fourth side iron step or ladder .In determining sizes thedimensions of the maintenance equipments likely to be used in sewer, shall bekept in mind.Urban Administration & Development Department Page 163
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GOVERNMENT OF MADHYA PRADESHDEPARTM
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Branch(i) A special form of cast ir
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A valve in which the closure to an
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Sullage waste Water:Spent water fro
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Laying:The approximate positions of
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CHAPTER NO.1CAST IRON SOCKET AND SP
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Socket and spigot pipes Class AWeig
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1.5 .4 Pipe shall be tested hydrost
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1.9.3 Mass (weight) of the various
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Diameter (mm)Weight (approx) kgHeav
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1.9.3.11 Cast iron plugs:-Diameter
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1.12.7 Caulking may be done with pn
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2.5 Thrust Blocks2.5.1 In case of b
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2.9.3 Should any test of the pipe l
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CHAPTER NO.3CAST IRON PIPES AND SPE
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3.4.2.2 Cast iron flanged spigot:-R
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3.4.2.6 All flanged cast iron tees:
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Nominal diameterTable 2.3Refer Tabl
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Table No.3.8DimensionWall thickness
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CHAPTER NO. 4DUCTILE IRON PRESSURE
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Nominal Diameter Outer diameter of
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4.3.2.4 Where the coating material
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Nominal DiameterDN (mm)Table No. 4.
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4.7.2.3 Lengths of FittingsThe perm
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during the jointing operations. As
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CHAPTER NO.5:UNPLASTICIZED PVC PIPE
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NominaloutsideDiameter(Nominalsize)
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5.10 Handling and storage5.10.1 Bec
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a)b) Size of the fitting and the ap
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5.14.5 Trench Bottom5.14.5.1 The tr
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CHAPTER NO.6CAST IRON VALVES6.1 App
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efore painting. All exposed machine
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with the main. For large aqueduct p
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6.4.7 Nominal sizes :-6.4.7.1 The r
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Table No.6.6Material for different
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CHAPTER -7GALVANIZED IRON PIPES, SP
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7.4.2 Globe Valves- The globe valve
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7.6 Testing of valves:-7.6.1 Genera
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NominalBoreDimensions and Nominal M
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7.10 Testing of Pipes :Following te
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Nominal BoreMinimum Outside Minimum
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7.15.2.2 Taper Screw Plug TestSocke
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7.20.2 All pipes and fittings shall
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S.NoTolerance and ovality is given
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8.7.2 The pipe shall be as uniform
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directional changes within the tren
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frequently used and in normal or sl
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8.22 Test to Establish Perfectibili
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8.26.6.3 PP Saddles8.26.6.3.1 The b
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g Bypass Pipe Carbon Steel IS1239(p
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9.4.1 Coupling Area of jointThis is
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Table No. 9.3Hydrostatic Design Pre
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polyester belts with a minimum widt
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9.19.4 Straight continues lengths o
Page 114 and 115: Table No. 10.2(Refer Table No.1 IS
Page 116 and 117: 1592-2003. The tolerances on the in
Page 118 and 119: 10.5.2.5 Weight of cast iron plain
Page 120 and 121: 10.5.2.9 Weight of cast iron Plain
Page 122 and 123: 10.8.1.1 Width- The width of the tr
Page 124 and 125: 10.11.2 Cast Iron Detachable Joints
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Page 132 and 133: 11.3.2 Each pipe and fittings may a
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Page 138 and 139: CHAPTER NO- 12UNPLASTICIZED NON-PRE
Page 140 and 141: 12.4 Dimensions of Pipes:12.4.1 Mea
Page 142 and 143: 12.8 Trench:-(See Drawing No.3)12.8
Page 144 and 145: 12.13.3 Care should be taken to lea
Page 146 and 147: 12.17.6 HandlingFollowing Recommend
Page 148 and 149: 12.17.10 Construction of backfill e
Page 150 and 151: CHAPTER - 13REINFORCED CEMENT CONCR
Page 152 and 153: Diameter ThicknessStrength Test Req
Page 154 and 155: Table 13.5(Refer Clause 8.2 IS 458
Page 156 and 157: efore the next pipe is laid. Adequa
Page 158 and 159: 13.11.4 The water shall be filled t
Page 160 and 161: Chapter - 14SEWER APPURTENANCES14.1
Page 162 and 163: provided with cover of medium duty
Page 166 and 167: 14.5.3.4 Where the diameter of the
Page 168 and 169: 14.7.4 Heavy reinforced concrete co
Page 170 and 171: 14.11 By pass:By pass arrangements
Page 172 and 173: acetate paper, silt drums, ropes, i
Page 174 and 175: 14.22. Automotive Suction Machine :
Page 176 and 177: 14.25.3 Brick Masonry Chamber : Aft
Page 178 and 179: 15.2.5 Lift: the vertical distance
Page 180 and 181: ensure that drilling has been done
Page 182 and 183: accepted deductions (stated as a pe
Page 184 and 185: described in IS 4031 (Part-5) : 198
Page 186 and 187: v) Cleat bolt of size M-10vi)vii)Se
Page 188 and 189: 15.17.5.3 To protect persons from i
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Page 194 and 195: 15.17.14.7 Clear out space shall be
Page 196 and 197: 15.17.15.7.1 Ordinarily no surplus
Page 198 and 199: Water Supply pipes lines should be
Page 200 and 201: 16.3.3 Failure to remove the ridge
Page 202 and 203: 16.9.12 The cover shall be capable
Page 204 and 205: 17.7 Development of tube-well with
Page 206 and 207: 17.13.4 Fine enough to prevent the
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5.3.2 The shape of the openings sho
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5.7.3.6.1 The contractor shall deve
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STRATACHATANNEXURE-2Mohalla/BastiNa
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LocationApparentResistivelyAB/2Inte
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GRAVEL PACKED TUBE WELLSGAVEL PACKE
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HAND PUMP PLATEFORMUrban Administra
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Urban Administration & Development
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Specifications Part 1 - Water Supply, Sewerage and Tube Well Works

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