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E-raamat: Plumbing Principles and Practice 2nd edition [Taylor & Francis e-raamat]

  • Formaat: 392 pages, 78 Tables, black and white; 252 Line drawings, black and white; 5 Halftones, black and white; 257 Illustrations, black and white
  • Ilmumisaeg: 07-Sep-2021
  • Kirjastus: Routledge
  • ISBN-13: 9781003172239
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  • Taylor & Francis e-raamat
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Plumbing Principles and Practice 2nd editionSuurem pilt
  • Formaat: 392 pages, 78 Tables, black and white; 252 Line drawings, black and white; 5 Halftones, black and white; 257 Illustrations, black and white
  • Ilmumisaeg: 07-Sep-2021
  • Kirjastus: Routledge
  • ISBN-13: 9781003172239
Teised raamatud teemal:
Taylor & Francis e-raamatudRohkem infot Taylor & Francis e-raamatute kohta
Raamatu kodulehekülg: https://www.taylorfrancis.com/books/9781003172239
"This book provides a complete introduction to plumbing services. It explains the principles and provides practical examples of planning, design, installation and maintenance of the plumbing technologies applicable to single-storey buildings, skyscrapersand everything in between"--

This book provides a complete introduction to plumbing services. It explains the principles and provides practical examples of planning, design, installation and maintenance of the plumbing technologies applicable to single-storey buildings, skyscrapers and everything in between. The book begins with an introduction to plumbing technology, the trade and its evolution. Chapters then cover:

  • Pipes, fittings and accessories, their installation and testing

  • Pumps, pumping systems

  • Hydraulic principles

  • Hot and cold water supply systems

  • Fixtures and appliances

  • Sanitary and storm drainage systems

  • And a chapter on special concerns such as seismic issues, safety, security and the state of the art

Written by a registered professional engineer and experienced teacher, this book is suitable for use on a wide range of courses from Building Services Engineering, Civil Engineering, Construction Technology, Plumbing Services, Environmental Engineering, Water Engineering and Architectural Technology.



This book provides a complete introduction to plumbing services. It explains the principles and provides practical examples of planning, design, installation and maintenance of the plumbing technologies applicable to single-storey buildings, skyscrapers and everything in between.

Foreword 1 xix
Foreword 2 xxi
Preface xxii
Acknowledgements xxv
List of abbreviations xxvi
List of figures xxviii
List of tables xxxiv
1 Introduction 1(14)
1.1 Introduction
1(1)
1.2 History of plumbing
1(1)
1.3 Plumbing practice: global perspective
2(2)
Australia
2(1)
United Kingdom (UK)
2(1)
United States of America (USA)
3(1)
India
3(1)
Bangladesh
3(1)
1.4 Scope of plumbing systems
4(1)
1.5 Importance of plumbing
5(2)
1.5.1 Environmental aspects of plumbing
5(1)
1.5.2 Health aspects of plumbing
6(1)
1.5.3 Energy aspects of plumbing
6(1)
1.5.4 Plumbing damaging property
6(1)
1.5.5 Plumbing as a development indicator
6(1)
1.5.6 Regulatory aspects of plumbing
7(1)
1.6 Principles of plumbing
7(4)
1.6.1 Achieving the objectives
10(1)
1.7 Basic plumbing requirements
11(1)
1.8 Plumbing practice
11(1)
1.8.1 Planning of plumbing
11(1)
1.8.2 Designing of plumbing
12(1)
1.8.3 Installation of plumbing
12(1)
1.8.4 Maintaining plumbing
12(1)
1.9 Plumbing practitioners and traders
12(3)
1.9.1 Plumbing professionals
12(1)
1.9.2 Plumbing contractors
13(1)
1.9.3 Plumbers
13(1)
1.9.4 Manufacturers and traders
14(1)
2 Hydraulics in plumbing 15(14)
2.1 Introduction
15(1)
2.2 Hydraulics
15(3)
2.2.1 Density
16(1)
2.2.2 Viscosity
16(1)
2.2.3 Surface tension
17(1)
2.2.4 Vapour pressure
17(1)
2.2.5 Temperature
18(1)
2.2.6 Other factors
18(1)
2.3 Pressure
18(3)
2.3.1 Atmospheric pressure
19(1)
2.3.2 Static water pressure
19(1)
2.3.3 Absolute pressure and gauge pressure
19(1)
2.3.4 Velocity and Pressure
20(1)
2.4 Flow of water
21(3)
2.4.1 Flow under gravitational force
21(2)
2.4.2 Flow under pressure
23(1)
2.5 Nomograph charts
24(2)
2.5.1 Nomograph of Manning's formula
25(1)
2.5.2 Nomograph of Hazen-Williams formula
26(1)
2.6 Friction loss
26(3)
3 Pipes and fittings 29(24)
3.1 Introduction
29(1)
3.2 Pipes
29(2)
3.2.1 Pipe classification
29(1)
3.2.2 Pipe sizes
30(1)
3.3 Pipes of different materials
31(7)
3.3.1 Iron pipe
31(3)
3.3.2 Steel pipe
34(1)
3.3.3 Plastic pipe
34(2)
3.3.4 Copper pipe
36(1)
3.3.5 Concrete pipe
37(1)
3.4 Fittings
38(11)
3.4.1 Uses of various fittings
39(4)
3.4.2 Fittings for special purposes
43(3)
3.4.3 Fittings of various materials
46(3)
3.4.4 Drainage fitting angle
49(1)
3.5 Storing pipes and fittings
49(4)
3.5.1 Storing pipes
50(1)
3.5.2 Storing pipe fittings
51(2)
4 Piping installation and testing 53(28)
4.1 Introduction
53(1)
4.2 Pipe installation
53(2)
4.3 Pipe cutting
55(1)
4.4 Pipe jointing
55(13)
4.4.1 CI pipe joints
56(2)
4.4.2 Galvanized steel or iron pipe joint
58(3)
4.4.3 Copper pipe joint
61(4)
4.4.4 Plastic pipe joint
65(3)
4.4.5 Concrete pipe jointing
68(1)
4.5 Supporting pipes
68(4)
4.5.1 Supporting vertical pipes
69(1)
4.5.2 Supporting horizontal pipes
70(2)
4.5.3 Spacing of pipe supports
72(1)
4.6 Pipe sleeve
72(1)
4.7 Installing underground pipe
73(2)
4.7.1 Structural safety of underground piping
73(2)
4.8 Testing of plumbing system
75(4)
4.8.1 Testing of water supply piping system
76(1)
4.8.2 Testing of drainage and vent piping system
77(2)
4.9 Disinfecting piping
79(2)
5 Pump and pumping system 81(31)
5.1 Introduction
81(1)
5.2 Pump
81(1)
5.2.1 Pump type
81(1)
5.3 Centrifugal pump
81(3)
5.3.1 Major components of a centrifugal pump
82(2)
5.3.2 Application of centrifugal pump
84(1)
5.4 Type of centrifugal pump
84(7)
5.4.1 Based on internal design
84(1)
5.4.2 Based on suction configuration
85(1)
5.4.3 Based on shape of impeller
85(1)
5.4.4 Based on casing design
86(1)
5.4.5 Based on motor and pump connection
87(1)
5.4.6 Based on type of flow
88(1)
5.4.7 Based on type of service or duty
88(1)
5.4.8 Based on support of pump
89(1)
5.4.9 Based on bearing support
90(1)
5.4.10 Based on staging of pump
90(1)
5.5 Pump characteristics
91(1)
5.6 Head calculation for centrifugal pumps
92(3)
5.6.1 Net positive suction head (NPSH)
93(1)
5.6.2 Factors affecting head loss
94(1)
5.7 Power
95(1)
5.8 Efficiency
96(1)
5.9 Speed
96(2)
5.10 Pump application in buildings
98(4)
5.10.1 Booster pump
99(1)
5.10.2 Circulation pump
100(1)
5.10.3 Submersible pump
101(1)
5.10.4 Sewage and sump pump
101(1)
5.11 Pump selection factors
102(1)
5.12 Pump and pipe installation
102(3)
5.12.1 Pump installation
102(2)
5.12.2 Piping arrangement
104(1)
5.13 Pump accessories
105(5)
5.13.1 Pump rotors
105(2)
5.13.2 Pump control panel
107(3)
5.14 Pump maintenance
110(2)
5.14.1 Routine maintenance
110(2)
6 Plumbing accessories and appurtenances 112(39)
6.1 Introduction
112(1)
6.2 Plumbing accessories and appurtenances
112(1)
6.2.1 Plumbing accessories
112(1)
6.2.2 Plumbing appurtenances
112(1)
6.3 Valves
113(1)
6.3.1 Non-automatic valves
113(1)
6.3.2 Automatic valves
114(1)
6.4 On-off valves
114(2)
6.4.1 Gate valves
114(1)
6.4.2 Butterfly valves
115(1)
6.4.3 Ball valves
116(1)
6.5 Globe valves
116(3)
6.5.1 Angle globe valve
117(1)
6.5.2 Needle valve
118(1)
6.6 Flush valve
119(1)
6.7 Check valve
119(3)
6.7.1 Swing check valve
119(1)
6.7.2 Tilting-disc check valve
120(1)
6.7.3 Butterfly check valve
120(1)
6.7.4 Lift check valve
120(1)
6.7.5 Piston check valve
121(1)
6.7.6 Stop check valves
121(1)
6.7.7 Double check valve
121(1)
6.8 Float valve
122(1)
6.9 Pressure controlling valves
123(3)
6.9.1 Pressure relief valve
123(1)
6.9.2 Pressure reducing valve
123(2)
6.9.3 Pressure sustaining valve
125(1)
6.9.4 Constant flow valve
126(1)
6.10 Temperature and pressure relief valve
126(1)
6.11 Air valves
127(2)
6.11.1 Air release valve
128(1)
6.11.2 Air inlet valve
128(1)
6.11.3 Combination air valve
129(1)
6.12 Actuators
129(3)
6.12.1 Manual actuator
130(1)
6.12.2 Powered actuator
130(2)
6.12.3 Comparison between pneumatic and electric actuator
132(1)
6.13 Solenoid valves
132(1)
6.14 Installation of valves
133(1)
6.15 Cocks
133(1)
6.15.1 Straight-way cock
133(1)
6.15.2 Angle cock
134(1)
6.15.3 Drain cock
134(1)
6.16 Faucets
134(4)
6.16.1 Compression faucets
134(2)
6.16.2 Fuller faucet
136(1)
6.16.3 Mixture faucet
136(2)
6.17 Water meters
138(3)
6.17.1 Positive displacement meter
138(1)
6.17.2 Velocity meter
139(1)
6.17.3 Compound meter
139(2)
6.17.4 Outside register of meters
141(1)
6.17.5 Meter installation
141(1)
6.18 Flow meters
141(2)
6.18.1 Installation of flow meter
142(1)
6.19 Pressure gauge
143(1)
6.19.1 Bourdon tube pressure gauge
143(1)
6.19.2 Diaphragm pressure gauge
143(1)
6.19.3 Pressure gauge selection
144(1)
6.20 Shower heads
144(1)
6.21 Water hammer arrestor
145(2)
6.22 Ablution hand shower
147(1)
6.23 Water tanks
147(4)
6.23.1 RCC or masonry tank
148(1)
6.23.2 Ferro-cement tank
148(1)
6.23.3 GI tank
149(1)
6.23.4 Stainless steel tank
149(1)
6.23.5 Plastic tank
149(2)
7 Water supply systems 151(42)
7.1 Introduction
151(1)
7.2 Water
151(1)
7.3 Water supply requirements
152(1)
7.4 Demand of water
152(4)
7.4.1 Population projection
155(1)
7.4.2 Variations in water demand
155(1)
7.5 Sources of water
156(3)
7.5.1 Surface water
156(1)
7.5.2 Groundwater
156(2)
7.5.3 Rainwater
158(1)
7.5.4 Water supply mains
158(1)
7.6 Water service pipe
159(1)
7.7 Water reservoirs
159(5)
7.7.1 Underground water reservoir
161(1)
7.7.2 Rooftop or overhead water tank
162(2)
7.8 Water supply methods
164(4)
7.8.1 Direct supply method
164(2)
7.8.2 Indirect supply method
166(1)
7.8.3 Underground-overhead tank system
167(1)
7.8.4 Pumping system
167(1)
7.9 Hydro-pneumatic tank system
168(5)
7.9.1 Hydro pneumatic tank
169(3)
7.9.2 Air compressor
172(1)
7.9.3 Fill pump
173(1)
7.10 Booster pumping
173(3)
7.10.1 Flow boosting
174(1)
7.10.2 Pressure boosting
175(1)
7.11 Water supply pipe sizing
176(6)
7.11.1 Flow rate and probable flow rate
176(2)
7.11.2 Pressure and pressure loss
178(1)
7.11.3 Pressure for distribution piping
179(1)
7.11.4 Pressure for faucets
180(1)
7.11.5 Limitation of flow velocity
180(1)
7.11.6 Friction loss and allowable friction loss
180(1)
7.11.7 Friction loss for fittings and valves
181(1)
7.12 Water supply pipe sizing methods
182(7)
7.12.1 Empirical design method
183(1)
7.12.2 Velocity design method
183(3)
7.12.3 Pressure loss method
186(3)
7.13 Pressure management in sky scrapers
189(4)
7.13.1 Hydraulic zoning
189(2)
7.13.2 Pressure reducing valve
191(2)
8 Hot water supply systems 193(41)
8.1 Introduction
193(1)
8.1.1 Hot water production
193(1)
8.1.2 Hot water temperature for personal requirements
194(1)
8.1.3 Importance of hot water supply
194(1)
8.1.4 Challenges of hot water supply
194(1)
8.2 Risk of hot water supply
194(2)
8.2.1 Scalding
195(1)
8.2.2 Legionella
195(1)
8.2.3 Explosion of heater
196(1)
8.3 Hot water supply requirements
196(1)
8.3.1 Hot water temperature for various requirements
196(1)
8.3.2 Hot water quantity requirements
196(1)
8.3.3 Hot water supply components
197(1)
8.4 Water heaters
197(13)
8.4.1 Direct fired water heaters
198(1)
8.4.2 Storage type water heaters
199(1)
8.4.3 Gas-fired water heaters
200(1)
8.4.4 Electric water heaters
200(1)
8.4.5 Oil-fired water heaters
201(1)
8.4.6 Water-jacketed tube water heaters
202(1)
8.4.7 Semi-instantaneous water heaters
202(1)
8.4.8 Tankless or instantaneous water heaters
203(2)
8.4.9 Indirect-fired water heaters
205(1)
8.4.10 Heat pumps
205(2)
8.4.11 Solar water heater
207(1)
8.4.12 Non-pressure type water heaters
208(1)
8.4.13 Pressure type water heaters
209(1)
8.4.14 Positioning water heaters
209(1)
8.5 Components and accessories of water heaters
210(1)
8.5.1 Storage tank
210(1)
8.5.2 Heat exchanger
210(1)
8.5.3 Thermostat
211(1)
8.5.4 Anode
211(1)
8.5.5 Vacuum breaker or vacuum relief valve
211(1)
8.5.6 Drain valve
211(1)
8.6 Two-temperature hot water service
211(2)
8.6.1 Heat energy requirement for heating
212(1)
8.7 Hot water distribution systems
213(3)
8.7.1 Direct or non-circulated hot water supply systems
213(1)
8.7.2 Circulated hot water supply systems
214(2)
8.8 Hot water distribution piping
216(1)
8.8.1 Branch and sub-branch pipes
216(1)
8.8.2 Feeder risers and main feeder pipes
216(1)
8.8.3 Return risers and main return pipes
216(1)
8.9 Closed-loop circulation system layout
217(5)
8.9.1 Gravitational closed-loop circulation systems
217(2)
8.9.2 Pressurized closed-loop circulation systems
219(3)
8.10 Hot water supply pumps and appurtenances
222(1)
8.10.1 Hot water pumps
222(1)
8.10.2 Circulation pump
222(1)
8.10.3 Balancing valve
223(1)
8.11 Hot water supply in skyscrapers
223(1)
8.12 Insulation of hot water supply elements
224(2)
8.12.1 Insulating tank
225(1)
8.12.2 Insulating pipe
225(1)
8.13 Pipe enlargement
226(1)
8.14 Hot water expansion
226(2)
8.14.1 The open vent pipe system
227(1)
8.14.2 Expansion vessel or tank
228(1)
8.15 Crossover
228(1)
8.16 Sizing hot water supply components
229(5)
8.16.1 Sizing water heaters
229(1)
8.16.2 Sizing expansion tank
230(1)
8.16.3 Sizing the branch supply pipes
230(1)
8.16.4 Sizing the return pipe
231(1)
8.16.5 Sizing the circulation pump
232(2)
9 Plumbing fixtures and appliances 234(41)
9.1 Introduction
234(1)
9.2 Fixtures
234(2)
9.2.1 Basic requirement for fixtures and appliances
234(1)
9.2.2 Common fixtures and appliances
234(1)
9.2.3 Materials for fixtures
235(1)
9.2.4 Materials for faucets and accessories
236(1)
9.2.5 Finishing of metals
236(1)
9.2.6 Allocation of fixtures
236(1)
9.3 Lavatories
236(5)
9.3.1 Wall hung basin
239(1)
9.3.2 Pedestal basin
240(1)
9.3.3 Counter basins
240(1)
9.3.4 Corner basin
241(1)
9.4 Bathtubs
241(2)
9.5 Bath trays
243(1)
9.6 Kitchen sinks
243(4)
9.6.1 Service sink
246(1)
9.7 Water closets
247(9)
9.7.1 Water closets of various styles of sitting
247(2)
9.7.2 Types of integrated trap
249(1)
9.7.3 Operating principles of water closet bowls
249(3)
9.7.4 Making of water closets
252(1)
9.7.5 Water closet type based on installation
253(1)
9.7.6 Shape of water closet
253(1)
9.7.7 Water closet seats
253(2)
9.7.8 Water closet trims
255(1)
9.7.9 Installation of water closets
255(1)
9.8 Urinals
256(3)
9.9 Bidets
259(1)
9.10 Flushing devices
260(5)
9.10.1 Flush tanks
260(2)
9.10.2 Flush valves
262(3)
9.11 Drinking fountain
265(1)
9.12 Washing machines
266(2)
9.12.1 Dishwashing machine
266(2)
9.12.2 Clothes washing machine
268(1)
9.13 Emergency fixtures
268(1)
9.14 Interceptors
269(3)
9.14.1 Grease interceptor
270(1)
9.14.2 Oil interceptor
271(1)
9.14.3 Sand interceptor
271(1)
9.14.4 Hair interceptor
271(1)
9.15 Floor drains
272(3)
10 Sanitary drainage systems 275(36)
10.1 Introduction
275(1)
10.2 Basic principles of drainage systems
275(1)
10.3 Basic requirements for drainage systems
275(1)
10.4 Categories of sanitary drainage piping
276(1)
10.4.1 Nomenclature of drainage piping
276(1)
10.4.2 Grouping of drainage piping
276(1)
10.5 Drainage system above ground
276(4)
10.5.1 Two-pipe system
277(1)
10.5.2 One-pipe system
278(1)
10.5.3 Single-stack system
279(1)
10.6 Sovent single-stack drainage system
280(3)
10.6.1 Aerator fitting
282(1)
10.6.2 De-aerator fitting
282(1)
10.7 Building drain
283(2)
10.7.1 Types of building drain
284(1)
10.8 Grading for building drains
285(1)
10.9 Offsetting of stacks
285(1)
10.10 Basement drainage system
285(3)
10.10.1 Sump pump
287(1)
10.11 Ventilation
288(7)
10.11.1 Stack ventilation
289(2)
10.11.2 Trap ventilation
291(4)
10.11.3 Location of vent stacks or stack vents terminal
295(1)
10.11.4 Grade of horizontal vents
295(1)
10.12 Sanitary drainage in skyscrapers
295(4)
10.12.1 Positive air pressure attenuator
298(1)
10.12.2 Air admittance valves
299(1)
10.13 Sizing sanitary drainage piping
299(5)
10.13.1 Sanitary drainage pipes
299(1)
10.13.2 Sanitary Drainage Fixture Unit (SDFU)
300(1)
10.13.3 Fixture drain pipe sizes
300(1)
10.13.4 Sizing horizontal branch drains
300(2)
10.13.5 Sizing drainage stacks
302(2)
10.13.6 Sizing building drain
304(1)
10.14 Sizing vent piping
304(3)
10.14.1 Sizing branch vent pipes
304(2)
10.14.2 Sizing vent stack
306(1)
10.15 Sizing sump pit and vent
307(4)
10.15.1 Sizing sump pit
307(1)
10.15.2 Sizing sump vent pipe
308(3)
11 Rainwater drainage system 311(19)
11.1 Introduction
311(1)
11.2 Rainwater characteristics
311(1)
11.2.1 Rainwater
311(1)
11.2.2 Rainfall intensity
311(1)
11.3 Scopes of rainwater drainage
312(1)
11.4 Functional techniques of rainwater drainage
313(1)
11.5 Collecting rainwater
313(2)
11.5.1 Rainwater collection from flat surface
314(1)
11.5.2 Rainwater collection from sloped surface
315(1)
11.6 Determining catchments
315(2)
11.6.1 Catchments of flat surface
315(1)
11.6.2 Catchments of inclined surface
316(1)
11.7 Rainwater generation
317(1)
11.8 Conveying rainwater
318(2)
11.8.1 Gutter
318(2)
11.9 Roof drain inlets
320(1)
11.9.1 Positioning RDP inlets
320(1)
11.9.2 Covering RDP inlets
320(1)
11.9.3 Sump around RDP inlets
321(1)
11.10 Rainwater drain pipe
321(4)
11.10.1 Gravity roof drainage system
322(1)
11.10.2 Siphonic roof drainage system
323(2)
11.11 Discharging of rainwater down pipes
325(1)
11.11.1 Disposing on natural ground
325(1)
11.11.2 Disposing in to the building or public sewer
325(1)
11.12 Sizing rainwater drain pipes
326(4)
11.12.1 For gravitational flow
326(1)
11.12.2 For siphonic flow
327(3)
12 Building sewer systems 330(19)
12.1 Introduction
330(1)
12.2 Building site drainage
330(1)
12.2.1 Type of building site drainage
330(1)
12.3 Building sewer systems
330(2)
12.3.1 Building sewer categories
331(1)
12.3.2 Building sewer components
332(1)
12.3.3 Draining methodology
332(1)
12.4 Building sewer piping
332(3)
12.4.1 Subsurface pipe drainage
333(1)
12.4.2 Positioning of sewers
333(1)
12.4.3 Grading for sewers
333(2)
12.5 Inspection pits and manholes
335(1)
12.6 Gravitational drainage
335(3)
12.6.1 Gravitational sanitary building sewer
337(1)
12.6.2 Gravitational storm building sewer
337(1)
12.6.3 Gravitational combined building sewer
338(1)
12.7 Surface drain
338(1)
12.8 Minimizing storm water drainage load
339(1)
12.8.1 Spreading rainwater on ground
339(1)
12.8.2 Induced recharge from storm drain appurtenances
339(1)
12.9 Sizing and placing of inspection pit or manhole
340(1)
12.10 Public sewer connections
341(3)
12.10.1 Sanitary and combined building sewer connections
341(3)
12.10.2 Building storm sewer connections
344(1)
12.11 Sizing building sewers
344(2)
12.11.1 Sizing of sanitary sewer
344(1)
12.11.2 Sizing of storm sewer
345(1)
12.11.3 Sizing of combined sewer
345(1)
12.12 Sizing surface drain
346(1)
12.13 Pumping drainage system
347(2)
13 Special concerns 349(18)
13.1 Introduction
349(1)
13.2 Special concerns
349(1)
13.3 Noise
349(2)
13.3.1 Control of noise
350(1)
13.4 Vibration
351(1)
13.5 Contamination of water
352(2)
13.5.1 Prevention of contamination
353(1)
13.6 Air locking
354(1)
13.7 Water hammer
355(1)
13.7.1 Arresting water hammer
355(1)
13.8 Freezing of water in piping
355(1)
13.8.1 Precautionary measures against freezing of water
355(1)
13.9 Corrosion
356(1)
13.9.1 Preventing corrosion
356(1)
13.10 Explosion
357(1)
13.11 Seismic protection
358(4)
13.11.1 Seismic protection for equipment
359(1)
13.11.2 Seismic bracing for suspended pipe
359(1)
13.11.3 Seismic bracing for heavy appurtenances
360(2)
13.12 Security fixtures
362(5)
Appendix 367(12)
Index 379
Syed Azizul Haq, a patent holder of the "mechanical seal trap" and author of Harvesting Rainwater from Buildings, is president of the RAiN Forum a non-profit voluntary platform for knowledge sharing and promotion of rainwater among scientist, engineers, architects, planners, academicians, practitioners, administrators, students and others who are directly or indirectly concerned about sustainable water management and, following 35 years with the Public Works Department in Bangladesh, also serves as a part-time faculty member at a number of universities.
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