environmental impact assessment...
TRANSCRIPT
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Environmental Impact Assessment (EIA)
Professor
Institute of Water and Flood Management (IWFM)
Bangladesh University of Engineering and Technology (BUET)
Dr. A.K.M. Saiful Islam
Training Course on ‘Training Course on Project appraisal, EIA and
Formulation of DPP’
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Lecture Topic
Major Environmental Parameters
Potential Impact on infrastructure development
projects
Example-1: Road Projects of LGED
National Policies, Strategies and Regulatory
Framework
Initial Environmental Examination (IEE)
Environmental Impact Assessment (EIA)
Example-1: Road Project
Example-2: Bridge Project
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PHYSICAL
ECOLOGY
HUMAN
Environmental Parameters
is components of environment. It can be grouped into major components.
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Physical Parameters
Regional Hydrology / Flooding
Drainage congestion/ Water Logging
Erosion and Siltation
Dust and Noise Pollution
Water Pollution
Soil characteristics/ Soil Fertility
Groundwater Table
Floods
Drainage Congestion
River Bank Erosion
Dust Pollution
Declining Groundwater table
Dhaka city
Water pollution
From industries
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Ecological Parameters Fisheries
Forest
Wildlife and Biodiversity
Solid Wastes
Nuisances Plant / Eutrophication
Wetland and Wetland Habitat
Terrestrial Habitat
Tree plantation / Urban Vegetation
Wastewater
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Human Interest
(Economic Impact) Loss of Agricultural Lands
Loss of Top soil of Agricultural lands
Employment opportunity
Industrial Activities
Irrigation Facilities
Navigation/ Boat Communication
Road Communication / Transportation
Agricultural Development
Landscape
Agriculture
Employment
Industry
NavigationLandscapeRoad Communication
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Quality of Life Values
(Social Impact)
Health and Well being
Sanitation and Pure Water Supply
Education / Literacy
Road Safety
Slum Improvement
Primary School
Slum improvement
Community clinicDrinking water supply
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Potential Impacts on Environment
A change in system exerts certain influence onmany different environmental parametersresulting a net positive or negative impact onthe environment.
Potential Impact on Environment will be demonstrated through a Infrastructural development project: Thana Road project of LGED.
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Ecological Impact
(a) Fisheries: (-) Roads prevent longitudinal
and lateral migration of fishes in the flood plain
(-) Obstruct movement of fishes onto natural feeding and breeding grounds in the flood plain.
(b) Forest: (-) Roads running through forest
area and plantations may be the cause of destruction of trees in the forest and alteration of ecology of the forest.
Fisheries
Fish breeding ground
Road running through forest
Example: LGED Thana Road Project
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Ecological Impact
(c) Plantation:
(+) The roadsides may be used for plantation of trees which is favorable impact of road construction.
(d) Wetland and Wetland Habitant:
(-) The road may encroach wetlands which may alter the ecology of wetlands and may cause destruction of wetland habitat.
(e) Nuisance Plant/Eutrophication:
(-) The Roads running through forest area and plantations may be the cause of destruction of trees in the forest and alteration of ecology of the forest.
Roadside plantation
wetland
Eutrophication
Example: LGED Thana Road Project
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Physico-chemical Impact
(a) Erosion and Siltation
(-) causes erosion during flood and siltation in the downstream.
(b) Drainage Congestion /Water logging
(-) roads interfere with cross drainage and can cause flooding or drainage congestion in adjacent areas during periods of high precipitation.
(-) May cause crop damage, water pollution and breeding of mosquitoes.
Road erosion
Road side water logging
Example: LGED Thana Road Project
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Physical Impact
(c) Regional Hydrology/Flooding
(-) Roads constructed across flood plains perpendicular to the direction of water flow cause back water effect and increase duration, frequency and extent of flooding in the up stream.
(d) Obstruction to Waste water flow
(-) Roads may obstruct the drainage of sewage and industrial waste water loading to serious pollution problem.
(e) Dust /Noise Pollution
(-) Dust raised from unpaved rural roads and blown by the vehicles can pose a health hazard and damage vegetation along the sides of the road. Dust pollution
Road obstruction to drainage
Example: LGED Thana Road Project
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Impact on Human Interest
(a) Loss of Agricultural Lands
(-) Construction of any road is associated with the loss of agricultural lands.
(b) Generation of Employment Opportunities
(+) Construction of road generates temporary employment during project implementation and permanent employment during maintenance phase.
(c) Navigation and Boat Communication
(-) Roads interference with navigation and boat communication at least for certain period of the year.
Agricultural land
Road construction
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Impact on Human Interest (d) Transportation and Road
communication (+) Transportation of people and goods from
one place to another saving time and cost.
(e) Tourism (+) Easy movement due to road improvement
has a positive impact on tourism, flourishing tourism at local as well as international level.
(f) Industrial Activities (+) Road communication promotes industrial
activities.
(g) Irrigation Facilities (+) Borrow-pits by the side of the roads
provide facility for small scale irrigation.
(h) Landscape (-) Scattered borrow pits, unauthorized
growth around road , erosion result in marred landscape.
communication
Borrow-pit Irrigation
Scattered borrow-pit
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Quality of Life Values
(a) Health and Well-being of Users (+) Improvement of road communication
facilitates to prompt access to health centers.
(b) Road Safety (-) Increase number and speed of motor
vehicles can lead increased accident cause death and injury.
(c) Culture and Landscape (-) Disturbances in natural landscape
would occur miss-managed borrow pit.
(d) Education /Literacy (+) Improve facilities easy movement of
people and created favorable environment and spreading education.
Health and well being
Road Safety
Literacy
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National Policies, Plan and
Regulatory Framework
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National Policies and Plans
National Environmental Policy (1992)
National Forest Policy (1994)
National Environmental Management Action Plan
NEMAP (1995)
Sustainable Environment Management Program (SEMP,
1998)
National Water Management Plan (NWMP, 2001)
National Adaptation Program of Action for Climate
change (NAPA, 2005)
Coastal Zone policy (2005)
Coastal Development Strategy (2006)
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National Environmental Policy 1992
Sets the policy framework for environmental
action, in combination with a set of broad
sectoral guidelines. It emphasize the following:
Maintenance of the ecological balance and overall
development of the country through conservation and
improvement of the environment.
Protection of the country against natural disasters
Identification and control of activities related to
pollution and degradation of the environment
Environmentally sound development
Environmentally sustainable use of all natural
resources
Active association with all environmental related
international initiatives to the maximum possible level
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Environmental Conservation Act (1995)
Environmental Conservation Rule (1997)
Environmental Court Act (2000)
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Environmental Conservation Act (1995)
The environmental conservation act was passed in the
parliament in 1995. The salient features of the Act are:
Power and function of the DOE and that of the DG
Declaration of Ecologically Critical Area
Regulation in respect of driving vehicles emitting smokes
Environmental Clearance
Formulation of Environmental Guidelines
Regulation of development activities from env. point of view.
Promulgation of standards of quality of air, water, noise, soils
Promulgation of acceptable limits of discharging and emitting waste.
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Environmental Conservation Rule (1997)
In order to enforce the ECA 1995, rules and regulations
were required. MOEF published in a gazette notification of
ECR in 1997. Relevant rules are:
Considerations for declaration of ecologically critical area
Procedure for granting environmental clearance
Requirements for IEE/EIA according to the appropriate
category of the projects (Green, Orange A, Orange B and
Red)
Environmental Clearance validity
Renewal of the clearance certificate
Provision of Appeal to the authority
Procedure of hearing Appeal
Determination of Environmental Standards
Determination of waste discharge and emission standards
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Environmental Court Act (2000)
The aim and objective of the Act is to materialize
the ECA 1995, through judicial activities. The
main features of this Act are:
The Govt. will establish Environmental Courts, one or
more in every Division.
Jurisdiction of the Courts
Procedure of activities and power of the Courts
Right of Entry for judicial inspection, and
Appeal and constitution of Appeal Court
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Environmental Clearance for Projects
Green Project – not required Book binding, Musical instrument, Assemble telephone,
photography, assemble bicycle, manufacture TV, Candle, etc.
Orange A Project – not required Poultry, Grinding, Cartoon, Dry cleaning, Comb, Pin, sports goods,
restaurant, press, weaving, cinema hall, wood, etc.
Orange B Project - IEE and EMP required PVC, Jute mill, glass factory, animal feed, ice-creme, carbon rod,
water purification plant, bricks, cold storage, rice mill, Garments etc.
Red Project – IEE, EIA and EMP required Tannery, Urea, Bridge length> 100m, Sugar, Cement, Oil refinery,
Battery, Detergent, Nuclear plant, Fiberglass, explosive, power
plant, hospital, ship manufacture, tobacco, metal boat, carpets,
water treatment plant, air conditioner manufacture, tyre factory etc.
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Environmental Assessment
Procedures
Initial screening and categorizing
Initial Environmental Examination (IEE)
Environmental Impact Assessment (EIA)
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Environmental Impact Assessment
(EIA)
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Environmental Impact Assessment (EIA)
Assessment of the beneficial and adverse changes in environment resources or values resulting from a proposed project.
Essential Elements
Identification of possible positive or negative impacts of the project.
Quantifying impacts with respect to common base.
Preparation of mitigation plan to offset the negative impacts.
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Environmental Impact Value
Vi = Relative change of the environmental quality of parameters
Wi= Relative importance or weight or parameter
N = total number of environmental parameters
n
i
ii )W(VEIV
1
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Quantification of Environmental
Impact
Changes of environmental
parameters
Severe (+5 or -5)
Higher (+4 or -4)
Moderate (+3 or -3)
Low (+2 or -2)
Very Low (+1 or -1)
No change (0)0 1 2 3 4 5
No change
Very low
Low
Moderate
Higher
Severe
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Relative importance of
Environmental Parameters
All parameters are not equal importance or
weight.
It varies from country to country
In Bangladesh flood, employment, agriculture,
fisheries carry more importance.
In next slide, a summary of relative importance
of parameters for Road project of LGED is
presented.
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EIA Procedure
1. Preparatory Works – study report, maps
2. Data collection – from all sources, survey,
satellite images, questionaire
3. Data Analysis – convert to change scale
4. Impact Evaluation – relative weight
5. Mitigation and Monitoring Plan –
Environmental Management Plan (EMP)
6. Preparation of Report – help decision makers
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ENVIRONMENTAL PARAMETERS Relative
Importance
Value
Degree
of
Impact
EIV
I. ECOLOGICAL
Fisheries
Forest
Tree Plantation
Wetland/Wetland Habitant
Nuisance Plant/Eutrophication
II. PHYSICAL
Regional Hydrology/Flooding
Drainage Congestion/Water logging
Erosion and Siltation
Dust Pollution/Noise Pollution
8
4
2
4
1
4
4
2
2
-2
0
+1
0
-1
-1
-1
-1
0
-15
-10
Example 1: Impact Evaluation of Road Projects
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TENVIRONMENTAL PARAMETERS Relative
Importance
Value
Degree
of
Impact
EIV
III. HUMAN INTEREST
Loss of Agricultural Lands
Employment Opportunities
Navigation/Boat Communication
Industrial Activities
Irrigation Facilities
Landscape
III. QUALITY OF LIFE VALUES
Health and Nutrition
Sanitation and Water Supply
Education/Literacy
Road Safety
Slum Improvement
Total Environmental Impact Value
6
6
2
3
3
2
3
3
3
3
3
-3
+3
-3
+2
+3
-1
+2
0
+2
-1
+2
+4
+15
-6
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Example-2: EIA of a Bridge
Component Value
Length 588.0 m
Spans 14 equal spans of 42.0 m
Design Water Level 5.07 m PWD
Vertical clearance 7.83 m
Elevation of the bottom of
Bridge at crest
12.90 m PWD
Height of deck at mid
section
15.70 m PWD
Longitudinal profile of
bridge
Type: Parabolic
Slope: 3%
Starting: Along bridge
centerline from mid-section or
crest section
Approach Roads Formation Level: 8.58 m above
the datum
A Bridge in Gopalganj Sadar Upzaila on the Madhumati River
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Regional hydrology and flooding
The construction of the proposed bridge will create 1 cm
afflux, which will cause insignificant impact on flood level.
Erosion
Planform analyses through Landsat TM images have
shown that between 1989 and 2010, the erosion rate was
less than 1.0 m/year at the proposed bridge section of the
river. The degree of impact has been assessed to be ‘very
low’ (-1).
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Water pollution
Construction activities such as piling, cutting and filling with material for
foundation of bridge, may generate loose mud and soil which may
increase turbidity of the river water. However, the effect due to
construction activities will be temporary and will not contaminate the
river water. Therefore, the degree of impact has been assessed to be
‘very low’ (-1).
Air quality
Dusts will be generated during construction activities which need
management especially due to the fact that the bridge site is very near
to habitats at both the eastern and western banks. Therefore, the
degree of impact has been assessed to be ‘low’ (-2).
Noise pollution
The bridge site is located at a rural setting. There are some shops
(Gopalganj end) and a mosque and some homesteads (Narail end)
near the bridge site. The noise generated during construction activities
and the traffic activities after bridge construction may cause some
problem. The degree of impact has been assessed to be ‘low’ (-2).
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Ecological Impact Fish and fisheries
The region is known for its fisheries resources and
Modhumita River is considered to be an important fish
migration route. The proposed bridge may create adverse
impact on the fisheries of Modhumita River, especially
during the construction phase. The degree of impact has
been assessed to be ‘low’ (-2).
Trees and vegetation
Some trees and few bamboo groves may need to be felled
during construction especially for approach road on the
Narail end. However, the damage will be minimal given the
commonality of the species. The degree of impact has
been assessed to be ‘low’ (-2).
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Impact on Human Interest
Loss of lands
To facilitate the smooth traffic communication on the
western side of the river, new approach road will be
required at the Narail end which will cause loss of
agricultural land. The degree of impact has been assessed
to be ‘moderate’ (-3).
Industrial activities
It is expected that the proposed bridge will expand the
industrial activities at the locality as well as in the region.
The degree of impact has been assessed to be ‘low’ (+2).
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Employment opportunity
Presently a large number of service holders face the
difficulty of crossing the Madhumoti River everyday for their
employment purposes. It is expected that the proposed
bridge will generate as well as enhance employment
opportunity other than short term labor during the
construction phase. The degree of impact has been
assessed to be ‘low’ (+2).
Transportation and communication
The proposed bridge will significantly enhance the road
communication between Gopalganj and Khulna through
Terokhada. In future, it will also facilitate the regional road
network up to Kolkata, after the construction of Kalia Bridge
under RHD. The degree of impact has been assessed to
be ‘high positive impact’ (+4).
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Navigation
Madhumoti River is an important local as well as regional
navigational route. Therefore, the proposed bridge will have
some impact on the navigability of the river, especially
during the construction phase. The degree of impact has
been assessed to be ‘low’ (-2).
Travel safety
Travel safety will improve for a large number of people who
now have to cross the river with only one available ferry
boat. The degree of impact has been assessed to be ‘very
low’ (+1).
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Service accessibility to health
The Madhumati River imposes a huge risk for the
emergency patients to reach Sadar Hospital at the
Gopalganj end. The risk will be significantly minimized and
travel time will be considerably reduced after the
construction of the proposed bridge. The degree of impact
has been assessed to be ‘moderate positive impact’ (+3).
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There are well-established schools, on the east side (Gopalganj
end) of the river. For the students from the Narail end, the bridge
will offer easier and convenient communication. Thus it is
expected that the bridge will improve existing literacy in the
region. Female education will be especially benefited. The
degree of impact has been assessed to be ‘moderate positive
impact’ (+3).
Cultural and Heritage Values
One important feature of the proposed bridge is that at one end
there is Bangabandhu Mausoleum, located at Tungipara of
Gopalganj District and at the other end there is Shat Gombuj
Masjid, located at Bagerhat District. So the bridge will facilitate
an easy communication between these two important national
monuments. Considering the importance of the proposed bridge
from the cultural and heritage point of view, the degree of impact
has been assessed as ‘+2’.
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TParameters Relative
importance
value
Degree of
impact
Relative impact EIV
Positive Negative
1. Physical -16
Regional Hydrology and
Flooding
4 -1 -4
Erosion 2 -1 -2
Water Pollution 2 -1 -2
Air Quality 2 -2 -4
Noise pollution 2 -2 -4
2. Ecological -20
Fish 8 -2 -16
Trees and vegetation 2 -2 -4
3. Human interest +47
Loss of lands 6 -3 -18
Industrial activities 3 +2 +6
Employment opportunities 6 +2 +12
Transportation and
communication
6 +4 +24
Navigation 2 -2 -4
Travel safety 3 +1 +3
Health 3 +3 +9
Education and literacy 3 +3 +9
Cultural and Heritage Values 3 +2 +6
Total EIV +69 -58 +11
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References: Environmental Assessment Guidelines for LGED
Projects, LGED, 2008
Guidelines on environmental issues related to
physical planning, LGED, 1992.
Environmental Impact Assessment, CERM, BUET,
2003.
Manual for Environmental Impact Assessment,
Bangladesh Flood Action Plan, MWR, 1995
Hydrological & Morphological Study and EIA of
Proposed Eighteen Road Bridges over different
rivers Under Construction of Large Bridge on
Upazila and Union Road Project, LGED, 2011.
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Thank you !