Ministry of Water Resources and Meteorology (MOWRAM) Asian Development Bank Cambodia Flood Damage Emergency Reconstruction Project – Output 3: Irrigation and Flood Control ADB Loan Number : 2852-CAM(SF) AusAID Grant Number: 0285-CAM(EF) SUB-PROJECT PROFILE BOEUNG KVEK Version 1 DECEMBER 2012 6 December 2012 In association with KEY CONSULTANTS (CAMBODIA)
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Ministry of Water Resourcesand Meteorology (MOWRAM)
Asian Development Bank Cambodia
Flood Damage Emergency Reconstruction Project– Output 3: Irrigation and Flood ControlADB Loan Number : 2852-CAM(SF)
The proposed scope of basic work for the emergency reconstruction of Boeung Kvek includes
the following works:
Raising the crest elevation of the dike for its length of 450 m to 50 cm above theelevation of the top slab of the regulator.
Bush and shrub clearance along dike Provision of laterite surfacing for improved access on dike crest Grass sodding on both side slopes of the dike or as required Install a steel ladder at the regulator to have easy access to the hoist platform Repair of steel gates including realignment of stem including painting, lubrication, oiling,
etc. Concreting works for additional headwall, parapet and railings Riprap protection at the top of wingwalls and end section of the dike to protect from
scouring during flood flow. Rehabilitation or replacement of two culverts across village access road with gated or
stop logged culverts to permit management of water inflow to system
The beneficiaries have expressed their desire to extend the rehabilitation of the dike to a higher
ground following the route of the foot path until the national road, the eastern boundary to the
project area. The main reason for this request is that their present village homes are always
flooded in wet season and they would move their homes to the proposed dyke. However the
dike embankment would need to be maintained as an access road so this would be impractical.
Thus, the option was considered to extend the dike to the national road by following the natural
contour of high ground and along the existing access road from the road bridge to the national
road (refer to Figure 3). Total length would be about 3 km. In conjunction with the village and
national road embankments this would effectively create a polder with a gross area of about 660
ha, of which about 150 ha comprises reservoirs; the net protected area would then be about
twice the actual Boueng Kvek beneficiary rice growing area. Further investigation including
topographic surveys, resettlement and environmental screening would be required to confirm
this option. Cost estimate is much higher and the option has been rejected.
2. Cost estimate
The basic cost of repairing the existing system (dyke reconstruction and regulator repairs)
amounts to about $100,000 without contingencies, which is considerably more than the initial
rough estimate in the PP of $6,278.
(The approximate cost for the proposed polder option would amount to some $334,000)
3. Photos
The following photos show the existing conditions of the Boeung Kvek dyke and structures.
Appendix 2 Screening for environmental impacts – BOEUNG KVEK
Screening Questions Yes No Remarks
A. PROJECT SITING
IS THE PROJECT AREA ADJACENT TO ORWITHIN ANY OF THE FOLLOWING
ENVIRONMENTALLY SENSITIVE AREAS?
PROTECTED AREAX No cultural heritage sites are
adjacent to or within the subprojects
area
WETLANDX
MANGROVE X
ESTUARINE X
BUFFER ZONE OF PROTECTED AREA X
SPECIAL AREA FOR PROTECTINGBIODIVERSITY X
There are no environmentally
sensitive areas within the subproject
area.
B. POTENTIAL ENVIRONMENTAL IMPACTS
WILL THE PROJECT CAUSE…
loss of precious ecological values (e.g. result ofencroachment into forests/swamplands orhistorical/cultural buildings/areas, disruption ofhydrology of natural waterways, regional flooding,and drainage hazards)?
X No loss in ecological values as the
subproject is to repair the existing
dykes and canal to the pre-flood
conditions within existing and long
established flood spreading irrigation
scheme
conflicts in water supply rights and related socialconflicts? X Water User Group (WUG) has been
already established and confirmed to
be working effectively to operate and
maintain the scheme. (project
selection criteria requirement).
Conflict resolution is included in the
FWUC strengthening.
impediments to movements of people andanimals? X No impediment expected for dyke
rehabilitation. If necessary temporary
bypass will be provided to local
people and animal passage during
construction and as specified in
contract documents
potential ecological problems due to increased soilerosion and siltation, leading to decreased streamcapacity?
X Scheme facilities do not impact any
streams. Repairs to embankment
include grass sodding bank
protection to reduce erosion risk.
Good construction practices to
mitigate soil erosion and silt runoff
are included in specification.
Insufficient drainage leading to salinity intrusion?X No salinity issues are expected at
soil pollution, polluted farm runoff andgroundwater, and public health risks due toexcessive application of fertilizers and pesticides?
X No change compared to pre-flood
conditions.
soil erosion (furrow, surface)?X No change from pre-flood conditions.
Bunded rice paddy irrigation will be
practiced on land without slope.
scouring of canals?X No canals
clogging of canals by sediments?X No canals.
clogging of canals by weeds?X No clogging of channels is expected
as the repair works will not affect the
existing pre-flood conditions.
seawater intrusion into downstream freshwatersystems? X Not applicable.
introduction of increase in incidence of waterborneor water related diseases? X The reconstruction works are to
restore the existing embankment to
the pre-flood conditions.
dangers to a safe and healthy workingenvironment due to physical, chemical andbiological hazards during project construction andoperation?
X Contractor is obliged to conform to
safety standards for protection of
public and workers through a Health
Safety Plan. No chemical, biological
and radiological hazards are
expected during construction and
operation. Only natural materials
such as soils or laterites will be used.
No chemicals will be used.
large population influx during project constructionand operation that causes increased burden onsocial infrastructure and services (such as watersupply and sanitation systems)?
X The number of non-local workers will
be small in number. If necessary,
construction contractors will be
required to provide a worker’s camp
with independent basic facilities.
social conflicts if workers from other regions orcountries are hired? X Priority in labor employment will be
given to local residents and non-local
workers will be small in number
risks to community health and safety due to thetransport, storage, and use and/or disposal ofmaterials such as explosives, fuel and otherchemicals during construction and operation?
X No explosives and chemicals will be
used for the subprojects.
community safety risks due to both accidental andnatural hazards, especially where the structuralelements or components of the project (e.g.,irrigation dams) are accessible to members of theaffected community or where their failure couldresult in injury to the community throughout projectconstruction, operation and decommissioning?
categorization. They are included in this checklist to
help identify potential climate and disaster risks.
Yes No Remarks
Is the Project area subject to hazards such asearthquakes, floods, landslides, tropical cyclonewinds, storm surges, tsunami or volcanic eruptionsand climate changes?
X Not Applicable
Could changes in temperature, precipitation, orextreme events patterns over the Project lifespanaffect technical or financial sustainability (e.g.,increased glacial melt affect delivery volumes ofirrigated water; sea level rise increases salinitygradient such that source water cannot be usedfor some or all of the year)?
X Not Applicable
Are there any demographic or socio-economicaspects of the Project area that are alreadyvulnerable (e.g., high incidence of marginalizedpopulations, rural-urban migrants, illegalsettlements, ethnic minorities, women orchildren)?
X Not Applicable
Could the Project potentially increase the climateor disaster vulnerability of the surrounding area(e.g., by diverting water in rivers that furtherincreases salinity upstream, or encouragingsettlement in earthquake zones)?
On the design stage, ensure that there areacceptable alternative borrow pit areas thatwould have an overall beneficial advantage interms of improved livelihood and reducedenvironmental impact.
TA Consultant, IA/EA TA Consultant, IA/EA,
CSC (FWUC)
1.Pre-Construction Detailed Engineering Design
2) Damage to existing structures The design should maximize benefits or avoidimpacts on assets. Resettlement framework forthe Project and Cambodian laws, policies, andregulations should be complied with.
TA Consultant, IA/EA TA Consultant, IA/EA,
CSC (FWUC)
3) Risk of land mine or UXO Consultative meetings with local communitiesare necessary to know clearly where there arerisks of mines or UXO. Unsafe areas should becleared before project implementation.
TA Consultant, IA/EA TA Consultant, IA/EA,
CSC (FWUC)
2. Construction Earthworks, site clearing,
hauling of construction
materials, piling works,
Operation of construction/
workers’ camps, borrow
operation, hauling of
construction wastes to spoil
sites
4) Dust generation The Contractor will be required to formulate andimplement a Dust Abatement Program thatincludes spraying of water on embankment/dykeused as roads and work areas within villagesclose to the road.
Vehicles transporting materials should becovered with tarpaulin or similar material
Contractor TA Consultant, IA/EA,
CSC (FWUC)
5) Noise and vibration The Contractor should ensure that constructionactivities within 100m of a village or town shouldbe limited between 12 PM to 2 PM and at night
Provide enclosures/barriers on major worksbeing undertaken on sensitive areas.
6) Water contamination Waste/used oil should be collected, properlystored and disposed to an approved site(according to national standard). Storage shouldbe in drums raised off the ground and properlycovered to keep rain water out. Lining or panshould be provided to contain any spills andsimplify clean up.
The Contractor shall prepare a SpillManagement Plan (including measures to betaken and equipment to be used) to ensureadequate cleanup of any spills.
Contractor TA Consultant, IA/EA,
CSC (FWUC)
7) Water-borne disease Fill-up depressed areas to prevent water pondingwhich may be used as breeding ground fordisease- carrying organisms mosquitoes
Borrow pits may be utilized for aquaculture or bedeveloped as water reservoir for community use.
Contractor TA Consultant, IA/EA,
CSC (FWUC)
8) Loss of agricultural land for
borrow pits
The contractor will use only licensed borrowoperators. There will be no side borrowpermitted, unless agreed to withembankment/dyke side residents.
The contractor will be responsible forrehabilitating any borrow sites opened and
9) Loss of trees Tree clearing should be avoided as much aspossible;
The borrow pits will need to be re-vegetatedbefore being handed back to the owner, or couldbe used for aquaculture.
Tree planting should be carried out in theappropriate location of the embankment/dyke.Coordinate with MoE regarding the species oftrees to be used.
Contractor TA Consultant, IA/EA,
CSC (FWUC)
10) Soil erosion The contractor will be required to implement soilerosion control to minimize soil erosion andsedimentation of waterways. The alternativeapproaches should be: (1) provide adequatecross drainage to avoid over flow or flooding and(2) re-vegetation of erosion-prone areas.
Contractor TA Consultant, IA/EA,
CSC (FWUC)
11) Generation of domestic wastes Sufficient garbage containers should be providedin construction camps and work sites
Employ regular disposal of waste in an approvedlandfill or site
Maintain cleanliness/orderliness at camps andwork sites
The Contractor should formulate and implementa Health and Safety Plan to protect both thepublic and the workers. A trained first aidpersonnel and health facility should be providedon site.
Provide potable water and sanitary facilities toworkers
Install warning signs like “safety first” at theconstruction area including fences or enclosures
Provide Protective Personal Equipment (PPE) toworkers e.g. safety shoes, hardhats, earplugs,etc.
The Contractor should implement a Health andSafety Plan to protect both the public and theworkers during cutting branch of big trees.
Contractor TA Consultant, IA/EA
12) Traffic congestion Contractor should perform the following: i) orienttheir drivers or equipment operators to complywith the required speed limit. (ii) drive at lowspeeds, especially in market, school, hospital,urban areas. (iii) keep the roadway or bypassaccessible to commuters to avoid traffic jams.(iv) park at designated area.
Provide appropriate storage area for theconstruction materials.
Detour road should be provided and accessibleto commuters