Pan Hlaing River Integrated Development Plan - gwp.org · require flushing/maintenance dredging ......
Transcript of Pan Hlaing River Integrated Development Plan - gwp.org · require flushing/maintenance dredging ......
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Pan Hlaing River Integrated Development Plan Global Water Partnership, Yangon
Alwin Commandeur 1 June 2017 Open
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Pan Hlaing River Integrated Development Plan | 1 June 2017
RHDHV in Myanmar
Experience working on maritime, industry and water projects in Myanmar since 1986. 30+
years
Through project experience and due to majority local team.
Reputation
Re- established a branch office in Yangon in 2013 and formed a legal entity in 2015. 4 years
Strong and energetic local team working from office and on various construction sites. 30 people
Unrivalled local track record, reputation and network in Myanmar.
Local knowledge
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Sluice gate
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Pan Hlaing River Integrated Development Plan | 1 June 2017
Feasibility Study of Pan Hlaing Sluice Pan Hlaing River Integral Development Plan (PHRIDP) Flood protection Water supply for agriculture and irrigation Socio-economical developments Pan Hlaing River area Sluice complex sketch design in the Pan Hlaing River
In close collaboration with stakeholders Supervise Geotechnical Investigation work Capacity Building at local Universities
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Site visit May 2015
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Pan Hlaing River Integrated Development Plan | 1 June 2017 5 Cofferdam
375 m
Pan Hlaing Bridge
upstream
Meazli Sluice
mouth
Kokowa river
downstream
Pan Hlaing River Overview
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Interest and Future Developments
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Challenges and Sluice gate locations
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Sluice gate Locations?
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Approach
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• Help practitioners with implementing comparable projects
• Describe tools and approaches that can be used
• Describe lessons learnt • Approaches and tools
illustrated by application of Learning-by-Doing projects
• Links to sources for more information
Fact-sheets & Co-design approach
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Fact-sheets & Co-design approach Graduate students Yangon Technological University and
Myanmar Maritime University help with filling the factsheet, based on guest lectures and excursion.
Motivation: Maximize knowledge uptake by Myanmar partners Promote understanding of used tools, approaches Exposure to practice for students to increase popularity IWRM
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View of Pan Hlaing River in dry season
Silt deposition in Pan Hlaing River at U/S of highway bridge (Low tide)
Silt deposition in Pan Hlaing River at U/S of highway bridge (Low tide)
Sedimentation Processes
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La Mu
Sedimentation in the middle of the reach
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February 2003 January 2010
December 2010 February 2014
Sedimentation in the middle of the reach
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Salinity front (maximum 2013-2014)
Low river flow (March)
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Salt intrusion Relevant parameters for saltwater wedge: Water depth (large depth, further intrusion) Fresh water discharge (pushes back salt wedge) Estuarine mixing
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Sedimentation processes at salt wedge
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(image courtesy of Dong Yoon Lee, Virginia Commonwealth University)
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Sedimentation processes
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Pan Hlaing River sediments
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Mud deposits (50% clay + 50% silt)
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Excavations by IWUMD
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1D SOBEK Model
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October 2015
Closure of the channel for passage
Made use of a basic model to explain why this sedimentation happened
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1D SOBEK Model
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Lateral inflow (irrigation/drainage)
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Model Outcomes
-4
-3
-2
-1
0
1
2
3
4
0 0.5 1 1.5 2 2.5 3 3.5 4
Wat
er le
vel (
m)
Time (days)
Tides
Tides dominant force “Sediment pumping” by tides Reduced tidal damping (floods)
Considerations Impacts of sluices (opening and closing) Input of sediment from Kokowa River / or
flushing of deposited sediments
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Natural system Significant sedimentation (significant
salt intrusion) Limited fresh water in dry season Significant limitations for agriculture,
residential and industry Improve above for Yangon’s ambitions
in agriculture and city development
Salt intrusion / sedimentation • Can be addressed by sluice • Sedimentation in front of sluice may
require flushing/maintenance dredging • Gate location preferred close to river
mouth Water balance aspects
• Estimated water demand may just be met • Water supply important • Increased water supply will be challenging • Large retention area preferred sluice
closer to river mouth Drainage
• Controlled water levels expected to limit flood events
• Drainage capacity sufficient • Large retention area preferred sluice
closer to river mouth
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Stakeholder Analysis
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Irrigation Department (ID) river section designed under the scope of
irrigation and drainage functions
suggests that by-pass channel and pipe
pumping (to Hlaing River) for waste water
discharging from industrial zones
supply the fresh water for agricultural
development scheme and Industrial zone
prevent the sea water intrusion (saline
water) and siltation problem
Hlaing Thar Yar Industrial Zone want to use Pan Hlaing River as
transport route until PH bridge worry about water quality with the lack of
proper treatment system from the zone want to have fresh water supply propose to locate the sluice gate near
the Pan Haling Bridge with navigability
Pan Hlaing Golf Course Estate Concern that existing free board of
the flood gate would be insufficient later
the best location of public access should be at the location of existing coffer dam.
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Yangon City Development Committee (YCDC) has a conceptual new town plan on
4,745 hectares defined by boundaries between Pan Hlaing River, Twante Canal and Hlaingtharyar -Twante Road.
Water supply for this new city from Pan Hlaing River - potential solution.
to add bridge in sluice design to link the new town with existing Yangon city
Farmers and Residents living along the River generally satisfied with the excavation works continuous access to fresh water improves their
well-being worried about flood & drainage willing to continue to use the river for
transportation after the project want to get fresh water for drinking and
domestic uses increase their agricultural production
Other Stakeholders General Administration Department
Settlement and Land Record
Department (Htantapin)
concerned of degradation of land and
pollution of the Pan Hlaing River
water, leading to reduction of fish
production.
Stakeholder Analysis
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Overview PHRIDP
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Overview PHRIDP
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Sluice location options
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Sluice location recommendation
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Myanmar & Water
“Water symbolizes purity, clarity and calmness, and reminds us to cleanse our minds and attain the state
of purity” (Buddism)
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Sluice design and construction phases (initial planning)
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Aug. 2015 April 2016
• Feasibility study • PHRIDP and recommendation sluice location
April 2016 Febr. 2017
• Investigations; • Bathymetrical, topographic, geotechnical, • Water, flow and sedimentation measurements
• Final & detailed design • Tender documents
Febr. 2017 End 2019
• Contracting • Construction phase
This project
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linkedin.com/company/royal-haskoningdhv
@RHDHV
facebook.com/RoyalHaskoningDHV
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Thank you for your attention! For more info, please contact me: [email protected]
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Pan Hlaing River Integrated Development Plan Global Water Partnership, Yangon Alwin Commandeur 1 June 2017 Open