john a. herbert 許 約 翰 - beam society · john a. herbert 許 約 翰 beam ... (standards of...
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BEAM Professional Training and Examination
23 July 2014
John A. Herbert
許 約 翰
BEAM Professional
Director BEAM Society Limited
Chairman Water Use, Technical Review Committee
Chairman BEAM Technical Review Panel
Water Use (WU)
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Whilst every care has been taken preparing this biography, with links, organisations may have change the location, or remove material without prior notice; this document was reviewed and updated on 6 November 2013.
1. Guidelines For Drinking Water Quality, WHO, 2008 - link 2. ISO 5667 - part 5 Water Quality Sampling (Purchase) - link 3. GB 3838-83 Environmental Quality Standard for Surface Water, PRC 4. WSD Fresh Water Plumbing Maintenance Guide, WSD - link 5. WSD ACQWS Paper No. 5. - Raw Water Quality Monitoring in Hong Kong - link 6. WSD ACQWS Paper No. 14 - Treated Effluent Reuse at Ngong Ping - link 7. WSD Annual Report, WSD - link 8. Hong Kong Waterworks Standards for Plumbing Installations in Buildings, WSD, Feb 2013 - link 9. Water Infrastructure. Water-Efficient Plumbing Fixtures Reduce Water Consumption and Wastewater Flows, USGAO. Report to
Congressional Requester, GA RCED-00-23, August 2000.- link 10. Sustainable retail premises: an environmental guide to design, refurbishment and management of retail premises, Prior (purchase) - link 11. APP-004 Water Supply and Wells (formerly PNAP 17) - link 12. APP-105 Water Seepage (formerly PNAP 230) - link 13. APP-099 Flushing Volume for Flushing Cisterns (formerly PNAP 220) - link 14. APP-006 Shops and Department Stores - Building (Standards of Sanitary Fitments, Plumbing, Drainage Works and Latrines) Regulation
5 (formerly PNAP 41) - link 15. Greywater and Rainwater Systems: Recommended UK Requirements, 13034/1 Report, March 1997, BSRIA - link 16. The Building Services Research and Information Association, Final Report 13034/1, March 1997 17. Water and Energy Conservation of Rainwater Collection Systems on Building Roofs, Advances in Building Technology, Vol. 2. Elsevier.
2002. pp 1281-1288 by Yang H X, Chow W H, Burnett J. 18. Cap 102 - Waterworks Regulations - link 19. Cap 123 - Building Regulations - link 20. Cap 358 - Water Pollution Control Ordinance - link 21. Handbook on Plumbing Installation, WSD - link 22. Study On Green Roof Application In Hong Kong, ArchSD - link 23. Dongjiang Water Quality (April 2009 - March 2010) , Water Quality comparison with GB 3838-83, WSD - link 24. Quality Water Recognition Scheme for Buildings (QWRS), WSD - link 25. Voluntary Water Efficiency Labelling Scheme (WELS) , WSD - link 26. Code of Practice for Water-cooled Air Conditioning System, EMSD, Jan 2008 - link 27. Good Operation and Maintenance Practice of Fresh Water Cooling Towers for Air conditioning Systems, EMSD, Nov. 2011- link 28. Prevention of Legionnaires’ Disease Code of Practice, 2012, EMSD - link 29. Guidelines for Carbon Audit, 2010, EPD - link 30. WSD Circular Letters - link
bibliography
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Water Use
WU Terminology
• POTABLE – drinking water fit for human consumption
• WELS – Water Efficiency Label Scheme
• Local Yield – Annual Rainfall
• Catchment – rainfall collecting area
• Greywater - waste water from showers for recycling
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Water Use
Water Cycle (or Hydrological Cycle)
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Water Use
Local Catchment Local Yield
6 mcm - million cubic metre
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Water Use
Spot the difference
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Water Use
Hong Kong Water History
1957 Salt water to Shek Kip Mei & Lei Cheng Estates
First in Hong Kong
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Water Use
Hong Kong Water History
1960 Supply Agreement Shenzhen Reservoir
(Importing Water)
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Water Use
Hong Kong Water History
1964
Severe Water Rationing
4 hours service, every 4 days
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Water Use
Hong Kong Water History
1965 Dongjiang 68.2 mcm/year supply contract
(Imported)
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Water Use
Hong Kong Water History
1973 Completion of Plover Cove Reservoir
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Water Use
Hong Kong Water History
1982 Water Rationing ended
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Water Use
Hong Kong Water History
1989 Dongjiang 1,100 mcm/pa supply contract
(imported)
(annual water use approx. 951 mcm 2007)
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Water Use
Hong Kong Water History
1994 Buildings commissioned before 1994 used GI
(galvanised iron) water piping
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Water Use
Hong Kong Water History
2002 Quality Water Recognition Scheme for
Buildings (QWRSB) by WSD
- Focus Potable Water http://www.wsd.gov.hk/en/customer_services_and_water_bills/application_for_licence_certificate/quality_water_recognition_scheme_for_buildings/index.html
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Water Use
Hong Kong Water History
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2003 Aquaduct commissioned
Covered supply to HK
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Water Use
Hong Kong Water History
2013 July 2013, the Flushing Water Plumbing
Quality Maintenance Recognition Scheme by
WSD http://www.wsd.gov.hk/en/customer_services_and_water_bills/application_for_licence_certificate/fwpqmrs/index.html
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Water Gathering
Grounds (HK)
Impounding
Reservoir
Water Treatment Works
Primary
Service
Reservoir
Service
Reservoir
To
Consumers Pumping
Station
Service
Reservoir
Pumping
Station
Consumers
Consumers
Raw Water
From Dongjiang
Water Service
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Service Reservoir
Consumers
Consumers
Pumping
Station
Consumers
Consumers
Non-return
Valve
Sea
Level
Sea Wall
Sea Water Service
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Promote through recognition
lower impacts, and
environmentally positive
features “green features” for
the whole lifecycle of the
built environment.
Intent of BEAM
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realign how we use water,
redefining ‘waste’ in building
operations, and raising
awareness to ensure water
is respected as a precious
resource.
WU Intent
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Water Use
BEAM Intent
• Recognise those organisations who
implement water and waste
conservation
• Lower Carbon CO2e Emissions
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Water Use
BEAM Intent
• Raise awareness Water is a limited
and precious resource
• encourage GREEN features
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Water Use
BEAM Intent
• Encourage water and waste water
Innovations
• Encourage use of 3rd party labelling
e.g. WELS
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Construction, Operation, Maintenance of Buildings
require WATER
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AHU AC Condensate
CREDIT: John Herbert
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Water Use
BEAM Rating Tools
• Each rating tool (NB, EB, BI) targets water and effluent
conservation
• The criteria are similar, with some subtle differences
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Green
Features
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Water Use
Green Features
• Twin Water Tanks
– Periodic Inspection
– Periodic Cleaning
– No INTERUPTION
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Water Use
Green Features
• Greywater ALTERNATE source
– Contains bacteria, detergents, phosphates, etc.
– water treatment
– End use capacity
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Water Use
Green Features
• Rainwater Harvesting ALTERNATE source
– Alternate water source, make-up water for cooling
towers, irrigation, fountains, etc.
– Relieve pressure on Municipal Drainage system
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Water Use
Green Features
• Green Roof
– Storage, relieving storm water pressure on Municipal
drainage system
– Microclimate, lower energy consumption
– Increase biodiversity
33 CREDIT: John Herbert CREDIT: John Herbert
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Water Use
Green Features
• Labelling WELS
– WSD scheme
– Taps, Showers, Mixing taps
– Voluntary Label
– 1 = highest/best
– Refer to www.wsd.gov.hk
– On-going
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Water Use
Green Features
35 CREDIT: WSD
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Water Use
Green Features
36 CREDIT: WSD
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Water Use
Green Features
• High Tech Irrigation System
37 CREDIT: John Herbert
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Water Use
Green Features
• Labelling QWRBS
• WSD scheme
• EB Maintenance
– Quality
– Water
– Recognition
– Scheme for
– Buildings
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Water Use
Green Features
• No Plastic Water Bottles
– Approx. 60,000,000 pa
– Lower Carbon Emissions
– Less waste
39 CREDIT: John Herbert
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Water Use
Green Features
• Mandatory - Cooling Tower blow down waste water from
cooling towers used for flushing water purposes
40 CREDIT: John Herbert
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Water Use
Green Features
YOUR IDEA
HERE (Innovations)
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New
Building
(NB)
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Water Use
WU NB Weighting
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WuP1 Water Quality Survey
Rationale
1. Provide quality Potable
water for all building
users
2. Proper Commissioning
3. Parameters shall be
QWRSB
Requirement
1. Water Sampling
2. Locations (all tanks and
farthest outlets in the
distribution system)
3. Schematic and layout
drawings c/w sample
points highlights
4. Method statements,
sample handling, etc.
5. Laboratory reports
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Water Use
Test Parameters Same As WSD’s QWRSB
pH:
Colour:
Turbidity:
Conductivity:
Iron:
E. Coli:
Total Coliform:
6.5 - 9. 2
≦15
≦3
≦300
≦0.3
NIL
NIL
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Water Use
WuP1 Common Mistakes
• Wrong Testing standard
– Incorrect parameters (not QWRSB)
– Incorrect laboratory (not HOKLAS for ecoli )
• Only Minimum Requirement
– One sample is the absolute minimum, for 1,000,000
sq ft. building is one enough?
• Missed water tanks, e.g. kitchens
• Missed Buildings
– Every building, including clubhouse
– Direct feed type systems not tested (refer intent)
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48
CREDIT: John Herbert
Pipework not capped during construction, allows dirt
and debris to collect inside and contaminate the water
distribution system.
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49 Source: WSD
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WuP2 Water Saving Performance
Rationale
1. Conserve Water
2. Reduce sewer waste
3. Lower CO2
4. Minimize adverse
environmental impacts
Requirement
1. Summary Table
2. Flow rate calculation at
working pressure
3. Schematic and Layout
drawings
4. Catalogue/cut sheets
5. Use baseline data
provided in BEAM
manual
6. Records, Cx data,
delivery notes, site
photographs, etc.
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Water Use
WuP2 Common Mistakes
• 1. Operating Pressure
– Same LOW flow fittings declared (low flow taps,
showers, etc.) for every level, and based on incorrect
water pressure
• 2. Simulation Calculation
– Annual baseline incorrect, missing taps, showers, bath
tubs, cleaners sink, disabled WC, etc.
– baseline/project case comparison incorrect
– One tap type used throughout whole building
– WC and urinals included where manual says not to be
included
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Water Use
WuP2 Common Mistakes
• 3. Energy Estimate
– Energy based on mixed water flow rate, not 60% hot
water, and 40% cold
• 4. Alternate Authority
– Inadequate justification for source of alternative data
should be CIBSE guide, IOP manual, ASPE, etc.
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Water Use
P = ρ g h
height (h)
tank
outlet
outlet
65.5 mpd
29.5 mpd
99.0 mpd
WuP2 Common Mistakes
h bar flow rate
l/min
32.5 3.25 14 68.5 6.85 20
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lower flow rate
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description size (mm) flow unit
shower 9.5 l/min
kitchen sink pillar tap (pantry) 22 6 l/min
kitchen sink mixer tap (pantry) 22 6 l/min
pillar tap 15 6 l/min
mixer tap 15 9 l/min
bath pillar tap 22 15 l/min
bath mixer tap 22 15 l/min
bidet 15 5 l/min
Pre-rinse spray valves kitchen 15 7 l/min
WC 15 7 L/flush
WC hose spray 15 5 l/min
Urinal 15 4.5 L/flush
Washing machine (horz) 15 12.6 L/kg/cycle
Washing machine (vert) 15 22 L/kg/cycle
WU Baseline / default Flow Data
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WuP2 Calculation format D
evic
e
du
rati
on
(s
eco
nd
s)
Dai
ly u
se p
er
occ
up
ant
Wo
rkin
g P
ress
ure
(b
ar)
water flow rate @ working pressure
daily consumption per person
(L/min) (L/min) (L) (L) Baseline Built Baseline Built
Tap 45 10.00 5.00 3.00 6.00 4.00 5.00 3.33 Tap 46 15.00 1.00 3.00 8.00 4.50 2.00 1.13 Tap 47 10.00 5.00 1.00 6.00 2.50 5.00 2.08 Tap 48 15.00 1.00 1.00 8.00 3.00 2.00 0.75 Tap 49 15.00 1.00 2.00 10.00 10.00 10.00 10.00
daily consumption per person 24.00 17.29
occupants 30.00 30.00
Operating days 365.00 365.00
annual consumption (litres) 262,800.00 189,325.50
annual consumption saved (litres) 73,474.50
percentage water saved 28%
Same for baseline
& built case
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Wu1 Annual Water Use
Rationale
1. Encourage higher
performance than PR
Requirement
1. Same as WUP1
2. Reward higher
performance.
3. Annual water saving of
20%, 25% or 30% earns
1, 2, or 3 credits
respectively;
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Water Use
Wu1 Annual Water Use
• WUPp2 and WU 1 have identical
requirements
• No need to duplicate calculations and
supporting documentation
• One submission covering both WuP2
and Wu1 is acceptable
58
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Wu2 Monitoring and Control
Rationale
1. Water Seepage APP105
2. Early water leakage
detection to minimize
waste water
3. Encourage design
1. No embedded piping
2. Leakage from exposed
pipe is self evident
4. Coverage for ALL areas
inside building(s)
Requirement
1. Summary Table
2. Schematic and layout
drawings (water)
3. Schematic and layout
drawings (detection
system)
4. All Concealed piping
including: Meter rooms,
pipe ducts, risers, under
floor, plant rooms, etc.
5. Record, log book, BMS
output, photographs, etc.
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Water Use
Wu2 Common Mistakes
• Coverage, Coverage, Coverage
– Detection system shall cover all concealed piping
including all plant rooms, ceiling voids, under raised
floors, pipe ducts, water meter rooms, risers, and all
other areas with concealed water pipework
– Underground piping is excluded from Assessment
– Exposed/surface mounted piping means any leakage
is self evident
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Wu3 Water Efficient Irrigation
Rationale
1. Integrated planning
2. Assess and minimise
environmental impacts
Requirement
Three Paths:
1. Irrigation system which
does not require
municipal water after
establishment period
2. Highly efficient irrigation
technology
3. Alternate Source
Greywater/Rainwater
harvesting installation
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Water Use
Wu3 Common Mistakes
• Not enough project planning consider irrigation
• Path 2
– Time clock is not innovative irrigation control
– Poor planning, irrigation system covers part of the soft
landscape area
• Path 3
– Incorrect assumptions for water consumption and
percentage potable water saving
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No Irrigation
CREDIT: John Herbert
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Traditional Sprinkler (Leaking)
CREDIT: John Herbert
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Wu4 Water Recycling
Rationale
1. Conserve potable Water,
use alternative source
2. Reuse water from
showers, washbasin,
condensate (not black
water)
Requirement
1. Greywater/Rainwater
harvesting installation
2. Calculations potable
water conservation
3. Schematic and layout
drawings
4. Catalogue/cut sheets
5. Records, log book,
meter readings, site
photographs
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66
Rainwater Greywater
sewer
roof
wash
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Water Use
Wu4 Common Mistakes
• Rainwater Harvesting
– Incorrect assessment of rainfall use HKO data
– Incorrect assessment formulae
– Inadequate storage tank capacity (at least 14 days,
but remember 28 consecutive dry days in Feb. 2011)
– Vertical Surface is not counted as collection surface
– Designer can choose any combination of collection
areas
– Any taps fed by untreated rainwater should be clearly
labelled, and where appropriate have their handles
removed to prevent children from drinking the water
• Greywater
– Not common
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Wu5 Water Efficient Appliances
Rationale
1. Appliances are
dishwasher, washing
machine, etc. (not
taps/showers)
2. Reduce potable water
consumption
Requirement
1. Calculation (BEAM
Baseline data)
2. Schematic and layout
drawings
3. Appliance information
WELS label, catalogue,
and data sheet
4. Records, delivery notes,
site installation
photographs
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Water Use
Wu5 Common Mistakes
– Incorrect application
– Fixtures (taps, showers, etc.) are NOT Appliances
– Most projects with Appliance used WELS grade 1
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Wu6 Effluent Discharge
Rationale
1. Reduce impacts
resulting from sewerage
discharge to lower
burden for municipal
waste handling systems
by 20%
2. Harbour Area Treatment
Scheme (HATS)
Requirement
1. Summary Table
2. Schematic and layout
drawings
3. Calculation (only WC
and urinals considered)
4. Technical information
WELS label, catalogue,
and data sheet
5. Records, delivery notes,
As fitted drawings,
record photographs
Credit: John Herbert
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Water Use
Wu6 Effluent Discharge
Urinal Sensor
Credit: John Herbert
Credit: John Herbert
Dual Flush WC
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Water Use
Harbour Area Treatment Scheme (HATS)
• HATS
72
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Water Use
Wu6 Effluent Discharge
73 Credit: John Herbert
Flushing
Water
Leakage
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Water Use
Wu6 Common Mistakes
• Incorrect Calculation
– Incorrect Male/female ratio calculation
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Wu Innovation
Rationale
1. IA - Encourage new
solutions, techniques,
and or technologies that
meet the Intent of a
BEAM Innovation
2. PE - significant exemplar
performance
3. Difficult, not automatic,
subject to scrutiny
Requirement
1. Submission must include
Quantitative data for the
idea, with substantiation
for the claimed emission
reduction and or averted
impacts
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Existing
Building
(EB)
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Water Use
INDOOR
ENVIRONMENTAL
QUALITY
ENERGY USE
SITE ASPECT
WATER
15%
MATERIALS
ASPECTS
Category Weighting Wu EB
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Water Use
Difference between NB and EB
Wu P1 Water Quality Survey
Wu P2 Minimum Water Saving Performance
Wu P3 Water Conservation Plan
Wu 1 Annual Water Use
Wu 2 Monitoring and Controls
Wu 3 Water Use for Irrigation
Wu 4 Water Recycling
Wu 5 Water Audit
Wu 6 Effluent Discharge to Foul Sewers
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Water Use
Difference between NB and EB
Wu P1 Water Quality Survey
Wu P2 Minimum Water Saving Performance
Wu P3 Water Conservation Plan
Wu 1 Annual Water Use
Wu 2 Monitoring and Controls
Wu 3 Water Use for Irrigation
Wu 4 Water Recycling
Wu 5 Water Audit
Wu 6 Effluent Discharge to Foul Sewers
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EB WuP3 Water Conservation Plan
Rationale
1. Promote continuous
development
2. Encourage active
management for water
resources
Requirement
1. List responsible person
2. Report
3. Director signature
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Water Use
EBWuP3 Suggested Content
– Organization chart
– Communication channels (staff, building users, etc.)
– Water monitoring
– Water Consumption
– Action Schedule to reduce water consumption
– Quantification of water savings
– Prepared by an E&M engineer
– director endorsement
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EB Wu5 Water Audit (BONUS CREDIT)
Rationale
1. Raise awareness
2. Encourage reduced
water consumption and
improved maintenance
Requirement
1. List Responsible person
2. Written Audit report
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Water Use
EBWu5 Suggested Content
– Objective, reduction of all types of water consumption,
raising awareness
– Scope, Overview and detail of the scope of work,
including exclusions i.e. tenants areas
– Operations, Overview and details of the building
operation
– Maintenance, Overview and details of maintenance
activities, deferred maintenance
– Drawings, AS FITTED schematic and layout drawings
– Records, Inventory, records for all areas of water use,
regular monitoring, consumption, O&M, etc.
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BEAM
Interiors
(BI)
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Water Use
BEAM Interiors (BI)
• Designed for fitout renovation projects
– Lower Environmental Impacts
– Recognition
– Water Conservation
– Education
– Raise Awareness
85
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Water Use
BEAM Plus Interiors (BI)
• Applications
– Offices
– Hotels
– Retail
– fit-out projects
– Related areas of Host building
86
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Water Use
Wu BI
Wu 1 Water Quality Survey
Wu 2 Minimum Water Saving Performance
Wu 3 Reduced Effluent to Sewer
Wu 4 No Bottled Water
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Water Use
BU Wu Summary
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BI Wu1 Water Quality Survey
Rationale
1. Good Water Quality
2. Minimise demand for
plastic drinking bottles
Requirement
1. Similar to NB
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BI Wu2 Water Saving Performance
Rationale
1. Minimize adverse
environmental impacts
2. Encourage WELS
Requirement
1. Same As NB except 1
point for 30%, or 2 points
40% water saving
Duration - IR sensor
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BI Wu3 Minimise Effluent Discharge
Rationale
1. Minimize adverse
environmental impacts
Requirement
1. Similar to NB
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BI Wu4 No Bottled Water
Rationale
1. Raise awareness
2. Reduce water bottle
usage
3. Reduce plastic waste
4. Encourage water coolers
with potable water
Requirement
1. List Responsible person
2. Layout plan with
equipment
3. Technical/cut sheets
4. Record photographs
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93
Plastic Hong Kong Beach
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Water Use
Strategies
1. Lower flow rate and or duration
2. Alternate source (rainwater)
3. Recycle (greywater)
4. Eliminate (design out)
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Conservation
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duration - IR sensor
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lower flow rate
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WSD WELS
Water Efficiency Labelling Scheme
lower flow rate
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Dual Flush WC water tap c/w infrared sensor
Urinal c/w infrared sensor
Case Study: ICAC Headquarters
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Water Use
Domestic Hot Water
• Water is wasted waiting for Hot Water to arrive at the
tap……..
– Central systems with large water volumes need short
dead leg > 300mm to prevent water waste
100
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Water Use
Strategies
1. Lower flow rate and or duration
2. Alternate source (rainwater)
3. Recycle (greywater)
4. Eliminate (design out)
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rainwater harvesting
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25 54
82
175
305
456
377
432
328
101
38 27
0
50
100
150
200
250
300
350
400
450
500
Jan Feb March April May June July Aug Sept Oct Nov Dec
Rain
fall
(m
m)
Mean Monthly Rainfall Hong Kong 1981-2010
data: http://www.hko.gov.hk/cis/normal/1981_2010/normals_e.htm#table2
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(Water Treatment omitted for clarity)
Rainwater Harvesting
RAINFALL
DRAIN filter pump
filter
Rainwater
Storage
Tank
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Water Use
Rainwater Harvesting
• First Flush
– After long periods of dry weather debris, dirt, leaves,
etc. accumulate on the catchment area
– simulation calculation should include the ‘loss’ of
collect water (first flush loss) to reduce organic and
bacteria load
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Month Jan Feb March April May June July Aug Sept Oct Nov Dec total
Roof Area (sqm) 900 900 900 900 900 900 900 900 900 900 900 900
Roof Factor (K) 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8
rainfall (mm/hr/sqm) 24.7 54.4 82.2 174.7 304.7 456.1 376.5 432.2 327.6 100.9 37.6 26.8
days 31 28 31 30 31 30 31 31 30 31 30 31
Duration (hours) 46 89 101 99 106 111 85 97 78 46 38 40
monthly rain (m/sqm/hr) 0.0247 0.0544 0.0822 0.1747 0.3047 0.4561 0.3765 0.4322 0.3276 0.1009 0.0376 0.0268
sub total (l/month) 1,278 5,447 9,340 19,457 36,335 56,955 36,003 47,164 28,747 5,222 1,607 1,206
First Flush Loss 500 500 500 500 500 500 500 500 500 500 500 500
total (l/month) 778 4,947 8,840 18,957 35,835 56,455 35,503 46,664 28,247 4,722 1,107 706 242,762
grass area (sqm) 200 200.0 200.0 200.0 200.0 200.0 200.0 200.0 200.0 200.0 200.0 200.0
requirement (l/sqm/d) 7.0 7.0 7.0 7.0 7.0 7.0 7.0 7.0 7.0 7.0 7.0 7.0
irrigation demand (l) 43,400 39,200 43,400 42,000 43,400 42,000 43,400 43,400 42,000 43,400 42,000 43,400 511,000
Case Study – Rainwater Harvesting
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Case Study – Rainwater Harvesting
Catchment coefficient (K)
Vegetation - 0.2
Flat roof with gravel layer - 0.5
Concrete/Ceramic Tiles - 0.75
Aluminium/Glass - 0.9
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Case Study – Rainwater Harvesting
Collection Σ = A.K.R.D.E - F
Where:
A= area sqm
K = Catchment Coefficient
R = Rainfall HKO reference
D = Days per month
E = Efficiency (overall loss)
F = First flush loss
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Dual flushing devices
Rainwater Harvesting system
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Water Use
Rainwater Harvesting
• Popular
• Not Innovation
• Relatively low cost
• Easy Implementation
• On-site treatment
• Local re-use
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Water Use
Rainwater Harvesting
• Applications:
–toilet flushing
–water feature make-up
–irrigation
–cooling tower make-up
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Water Use
Rainwater Harvesting
• Storage Capacity
–Hong Kong’s Winter season is
dry, up to 28 consecutive dry
days have been recorded.
–14 days storage
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Water Use
Strategies
1. Lower flow rate and or duration
2. Alternate source (rainwater)
3. Recycle (greywater)
4. Eliminate (design out)
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greywater
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Water Use
Greywater
• Used Water Sources:
– Washbasins
– Sinks, except kitchen
– Showers
– Baths
– Washing machine rinse cycle
– Condensate from Air Condition systems
– Cooling Tower Blowdown
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SEPARATE DUAL STACKS
Greywater
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Water Use
Greywater
• Precautions/Considerations
– greywater may contain chlorine, sodium and
phosphorous from detergents
– Untreated greywater cant be stored due to bacteria
growth
– AVOID untreated direct application/human contact
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Water Use
Greywater
• Potential Greywater Applications
– Toilet/Urinal flushing
– Irrigation
– Make-up for water feature
– Make-up for cooling tower
– Make-up water for Cleansing water
Actual standard depends on water end use
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Water Use
Greywater Standard
• Water Treatment is typically required
• The ‘Standard’ depends on the actual APPLICATION
• The standard for treatment to provide potable water is
different to that use to provide irrigation or flushing water.
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HKIA
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Water Use
Strategies
More design not less……
1. Lower flow rate and or duration
2. Alternate source (rainwater)
3. Recycle (greywater)
4. Eliminate (design out)
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Green = good?
Credit: John Herbert
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Credit: John Herbert
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Traditional Sprinkler Leaking
Credit: John Herbert
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Credit: John Herbert
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Water Use
Landscaping Irrigation
Plan/Consider the environmental
impact:
–Watering demand
–Species selection (native)
–Irrigation System - Use alternate
Greywater / Rainwater water
–Fertilizer
–run off
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Water Use
Consider Species
• drought tolerant tree species:
– Acacia baileyana (NSW provenance)
– Acacia melanoxylon (Victorian provenance)
– Casuarina cunninghamiana Brachychiton
acerifolia (Flame Tree very similar in
appearance to the Delonix regia in HK)
– Eucalyptus camaldulensis (Inland provenance)
– Eucalyptus citriodora Eucalyptus sideroxylon
(Inland provenance)
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Subterranean
Irrigation
Credit: John Herbert
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Water Use
Legionella Assessment & Prevention
• Legionella is a waterborne bacteria that
causes potentially fatal Legionnaires‘
disease, and flu-like illness called
Pontiac Fever
• Present in nature, in lakes, rivers,
stream, groundwater at low
concentrations
• Bypassing Municipal water treatment ,
given the right conditions, it can
proliferate in buildings, causing human
infection and disease.
• Refer Hong Kong Code of Practice and
ASHRAE Standard 130
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Water Use
Examination
15% Framework + Innovation
25% SA Site Aspects
10% MA Materials Aspects
25% EU Energy Use
15% IEQ Indoor Environmental Quality
10% WU Water Use
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Water Use
T +852 3610 5700
F +852 3996 9108
www.beamsociety.org.hk
1/F Jockey Club Environmental Building,
77 Tat Chee Road, Kowloon, Hong Kong
香港九龍塘達之路77號賽馬會環保樓1樓
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For later questions, please email us:
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Water Use
Keywords
• QWRS - Quality Water Recognition Scheme
• 優質食水認可計劃
• WELS - Water Efficiency Labelling Scheme 用水效益標籤計劃
• HATS - Harbour Area Treatment Scheme 淨化海港計劃
• Legionella 退伍軍人病桿菌
• Potable Water Storage Tanks 食水缸
• Rainwater Harvesting 雨水收集
• Flushing Water / Sea Water 沖廁水 / 海水
• Greywater Irrigation 污水灌溉
• Periodic Inspection 定期檢查
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