Module 4 - Construction of a gravity fed system

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Fig.25: Crossing a shallow river. - Crossing a road The pipe must be buried at a minimum depth of 1m. Use only GI pipe, a GI sleeve or concrete culvert. - Marking blocks To mark the pipe laying, concrete or masonry marking blocks must be installed every 100m, especially at the joints level, and at each sensitive point (junctions, change of direction, etc). Ideally, you must indicate on the blocks the pipe type and diameter, the direction of the flow direction and a block registration number. Fig.26: Marking block. 57
III.6. WORK DURATION AND MANPOWER The time necessary to construct a GFS depends on many factors such as length and complexity of the network, participation and motivation of the beneficiaries, weather, etc. The work requiring specialized workers during the construction of GFS are the pipe laying and the civil work. This work requires the supervision of 1 or several experience technicians. The villagers are generally involved in various works as follows: • The clearing of the future pipeline layout and transportation of equipment, • The trench and foundations digging • The drainage of remaining water and external protection of the various infrastructure works (for example protection fence) In table 14 are indicated the necessary manpower and average completion period of main works of a GFS construction. Work / Activity Table 14: Work duration and manpower Construction period Number of necessary specialized worker Number of necessary villagers Catchments 7 days 1 5 - 6 Plastic header tank 4 - 5 days 1 10 Concrete header tank 7 - 8 days 1 10 Plastic reservoir 5 - 6 days 1 10 Concrete reservoir 3 weeks 2 15 Tap stand 7 - 9 days 1 5 - 6 Trench 5 m/pers/d - all Pipes laying 50 m/pers/d 1 – 2 5 - 6 Backfilling 8 m/pers/d 1 all Material transportation - - 15 - 20 58
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2007 UPDATE
Page 3 and 4:
I. INTRODUCTION The construction of
Page 5 and 6:
Gravel is used only in the making o
Page 7 and 8: Table 2: Increase of concrete resis
Page 9 and 10: Result: • Calculate the volume of
Page 11 and 12: angle sides are preferable. To guar
Page 13 and 14: We differentiate steels bars accord
Page 15 and 16: The slab thickness (e) must be at l
Page 17 and 18: For the rectangular tank of importa
Page 19 and 20: → Rectangular tank Capacity and d
Page 21 and 22: The water quantity to be added depe
Page 23 and 24: III. CONSTRUCTION OF THE INFRASTRUC
Page 27 and 28: III.2. STORAGE TANK The tank is mad
Page 32: For the pre-manufactured plastic ta
Page 40: III.4. TAPSTAND All the tapstands m
Page 44: Figure 14A Tapstand 2 43
Page 47 and 48: Fig.15: Example of tapstand . A pie
Page 49 and 50: Self closing tap "Talbot" Public wa
Page 51 and 52: elbow 45° Joining two pipes with 4
Page 53 and 54: For the joining of PE pipes, we use
Page 55 and 56: - Backfilling Use the same ruble to
Page 57: Fig.24: Crossing a gully or a river
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Module 4 - Construction of a gravity fed system

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