contents...1 contents introduction 2 base concept on damage assessment & drone survey 2...

1

Contents

Introduction 2

Base Concept on Damage Assessment & Drone Survey 2

Methodology 3

Major Landslide Location - 2017 4

Annexure 1: Landslide Damage Assessment Individual Reports I

1. Landslide: Wewalkandura (Kalawana DSD, Ratnapura District) IV

2. Landslide: Horangala (Nivithigala DSD, Ratnapura District) XIII

3. Landslide: Wanniwatta (Nivithigala DSD, Ratnapura District) XXII

4. Landslide: Neluwankanda (Nivithigala DSD, Ratnapura District) XXX

5. Landslide: Ambalapitiya (Dehiowita DSD, Kegalle District) XXXVIII

6. Landslide: Diddeniya (Kuruwita DSD, Rathnapura District) XLVI

7. Landslide: Thalawitiya (Eheliyagoda DSD, Rathnapura District) LIV

8. Landslide: Arabbada (Eheliyagoda DSD, Rathnapura District) LXII

Annexure 2: Informative drone survey orthomosaic map LXIX

2

Introduction

The wettest time of the year in Sri Lanka’s south is usually from May to September. The South-

West monsoon unleashed torrential rains, which ravaged fourteen districts in the western and

southern parts of the country in May 2017. Heavy rain caused raise of water level 300 mm - 500 mm

in 24 hours on the 25th of May 2017, and it resulted raise of water level rivers, particularly the Kelani

river water level raised by 15.44 meters. Thousands have been displaced and hundreds killed by the

floods and landslides caused by the unprecedented rain. Disaster Management Center reports

631,346 people of 164,264 families had been affected by the weather calamity, 203 killed and 96

people had gone missing. The worst affected district in terms of the numbers affected is Galle.

The objective of this report is assess the damages cause by landslides and cut slope failures using

unmanned aerial vehicle (UAV). Team, comprised of four scientists from Human Settlements

Planning and Training Division (HSPTD) of NBRO, engaged in data collection and site visits together

with the Geologists of Landslide Research and Risk Management Division (LRRMD) of the NBRO

Galle district office. The team also engaged in discussion with the staff of LRRMD Matara district

office.

Base Concept on Damage Assessment & Drone Survey

DAMAGE ASSESSMENT

Damage Assessment means preliminary but fairly accurate onsite evaluation of damage or loss

caused by natural event before filing a formal claim or disaster declaration. Damage assessment

records the extent of damage, what can be replaced, restored, or salvaged, and time required for

their execution.

DRONE SURVEY

Remote Aerial Surveys combines the latest advances in Unmanned Aerial Vehicles (UAVs) with

innovative uses of imaging equipment to perform a wide range of high quality mapping & aerial

surveys. UAVs are the perfect solution to get up-to-date high resolution imagery filling in the gaps

from other survey methods by providing more recent & more precise data.

3

Methodology

Landslide Location & initial information collection

Field Reconnaissance Survey

Damage Assessment Survey Drone Survey

Landslide Damage Data & Information

Develop Ortho mosaic and 3D images

Develop Informative Ortho Map

Data to Develop Vulnerability Curves

Develop Vulnerability Curves

Report on Landslide Damage Assessment and Drone Survey

4

Major Landslide Location - 2017 NBRO had received information on 39 major landslides occurred in May 2017. List of landslide locations are as follows;

District DSD S/N GN Location Type of failure

Rathanpura

Eheliyagoda

1 Maheengoda Thalawitiya watta Landslide

2 Kalatuwawa east Bogoda kanda Landslide

3 Asgangula South Palandahena Landslide

4 Pelpitiya Arabboda Landslide

5 Karadana north Landslide

6 Karadana west Cutting failure

7 Bopeththa Kukuleliyadda, Meemurewatta Landslide

Kiriella 8 Handukanda Kodithuwakkukanda, Dolapallehena

Landslide

Nivithagala

9 Wanniwatta Horaketiyahena, kiribathgala Landslide

10 Horangala Udakaravita

11 Begotuwa Neluwankanda

12 Gamekanda Landslide

Elapatha 13 Weragama Alupathgala Landslide

14 Batakada Girapagama (Palagama) Landslide

Kalawana 15 Wewalkandura Horton watta Landslide

Kahawatta 16 Bungiriya Bungirikanda Landslide

Kuruvita 17 Pathberiya Diddeniya lowland area

Ayagama 18 Ayagama Town area Landslide

Kegalle Dehiowita

19 Ambalanpitiya Ambalanpitiya Landslide

20 Welangalla K 90/2, Welangalle, Getaheta Slope failure

Matara

Kotapola 21 Morawaka Morawakkanda Landslide

Pasgoda 22 Rotubma east Idigalgoda kanda Landslide

Walasmulla 23 Ranmale Saputhanthrikanda Landslide

Kaluthara

Bulathsinhala

24 824F, Karalidekma Thibbotukanda Landslide

25 Yatagampitiya Landslide

26 Bogahawatta Cutting failure

27 Kobowela Landslide

28 Paragoda west, Morawaka Landslide

29 Niggaha, Pahiyangala Landslide

Baduraliya

30 Athwelthota Near Kalawana Matugama Main Road Upto Palan gaga

Landslide

31 Mawatta, Delkith part, Bellana east

Landslide

32 Diganna Diganna Landslide

33 Kukuleganga - in front of underground power station

34 Kukuleganga - Kelinkanda area (Located behind temple)

35 834A Bellana East Mawatha Watta Landslide

Walallawita 36 843F, Weerakanda Landslide

Agalawatta 37 833 -Kithulgoda Kithulgoda Kanishta Vidyalaya Muddy Water flow

Colombo Padukka 38 Thummodara Pathagiwatta Landslide

Galle Neluwa 39 Kosmulla Duli Ella Tea Factory, Kosmulla, Neluwa,

Landslide

I

Annexure 1: Landslide Damage Assessment Individual

Reports

III

Wewalkandura

Wewalkandura

Kalawana

Ratnapura

Sabaragamuwa

IV

1. Landslide: Wewalkandura (Kalawana DSD, Ratnapura District)

Introduction

This damage assessment and drone survey report is on the landslide occurred in Wewalkandura

area (Wewalkandura GND, Kalawana DSD, Ratnapura District, Sabaragamuwa Province) on May

26, 2017 at 0610 hrs. This report is developed bases on the data and information collected in the

field and drone survey conducted on site.

Name of the Village : Wewelkandura

GND : Wewelkandura 175A

DSD : Kalawana

District : Ratnapura

Province : Sabaragamuwa

Global Position (GPS) : 6°31'53.4404"N 80°26'09.5205"E

Previous and Current Condition of the Landslide Location

Previous condition of landslide location (Source: Google Earth);

V

Current condition of landslide location (Source: Drone Survey);

Length of Landslide:

363m

VI

Analysis on Landslide

Basic information of the landslide as follows;

Basic Information of Landslide

Landslide type Debris flow

Date of Occurrence May 26, 2017 / 0610 hrs

Date of inspection May 31, 2017 / 1000 hrs

Crown Width 96 m

Crown Height 30 m

Initiation Area length

Maximum Width 94 m

Length of Landslide 363 m

Width at Middle 94 m

Slope Type Concave

Initiation Area Slope Angle 45-50 deg

Deposited Area Slope Angle 8 deg

Erosion Type straight

Hydrology Pattern Stream

VII

LANDSLIDE BOUNDARY OVERLAY ON LANDSLIDE HAZARD MAP

VIII

ANALYSIS ON ALONG LANDSLIDE FLOW PATH (LONGITUDINAL PROFILE)

Based on drone survey, landslide had been analyzed for further information. Information and data

acquired from Ortho image and Digital Elevation Model (DEM) developed through drone survey.

LONGITUDINAL PROFILE DETAILS A - A’

Start Position 6° 31' 56.9340" N, 80° 26' 13.1897" E

Start Height 97.731 m

End Position 6° 31' 47.1382" N, 80° 26' 06.9127" E

End Height 16.074 m

Path Length 358.4 m

Straight-Line Distance 357.41 m

3D Distance on Surface 383.47 m

Vertical Difference (Start to Finish) -81.7 m

Total Climbing 7.3 m over 66.071 m on surface

Total Descending 89.0 m over 317.39 m on surface

Minimum Elevation on Path 14.639 m

Maximum Elevation on Path 97.731 m

Azimuth 212° 39' 14.1"

Slope/Tilt -12.87°

Max Path Slope 70.88° [1.051 m along path]

* Reference Point: 6° 31' 43.7726" N, 80° 26' 02.6654" E (Elevation of this reference point is considered

as 0 meter)

IX

ANALYSIS ON CROSS SECTION (CROSS SECTIONAL PROFILE)

CROSS SECTIONAL PROFILE DETAILS B - B’



End Position 6° 31' 51.8264" N, 80° 26' 12.1681" E

End Height 41.929 m

Path Length 95.26 m



Vertical Difference (Start to Finish) 7.1 m





Azimuth 121° 21' 46.6"

Slope/Tilt 4.26°

Max Path Slope 68.35° [0 m along path]


as 0 meter)

X

Landslide Damage Assessment

In the location, before landslide its main landuse is tea, cinnamon, arecanut, Jackfruit trees and

residential uses. Current land value is Rs. 15,000.00 per perch. Other information of location as

follows;

Land use management Human Impacted

Erosion type Straight

Slope type Concave

Initiation area Slope Angle 45-500

Deposited area slope Angle 80


LANDSLIDE IMPACT ON HUMAN LIFE

Number of Deaths 13

Injuries Not Recorded

Fully Damaged Buildings 04 Typical houses

Partially Damaged Buildings Not Recorded

Infrastructure Damages Road, Electricity

ESTIMATED ECONOMIC LOSS AFTER A LANDSLIDE EVENT

Crop # of plant Total yield Unit Price (Rs) Total Loss (Rs)

Coconut 50 3500 nut/year 50.00 175,000.00

Arecanut 50 50000 nut/year 105.00/100nuts 52,500.00

Cinnamon (kg) 15 75 800.00 60,000.00

Jack fruit 30 450 50.00 22,500.00

For 1 ha total loss 310,000.00

Estimated area buried under landslide is 1.4 ha 434,000.00

Expected loss over 10 year period 4,340,000.00

Tea (ha) 1.6 1500 kg/ha/year 600.00 1,440,000.00

Expected loss over 10 year period by losing 1ha Tea land 14,400,000.00

Area of Building (m2) Construction cost/m2 # of houses Total Loss (Rs)

Houses 160 10000.00 4 6,400,000.00

Length (m) width (m) Cost per (m2) Total Loss (Rs)

Road (concrete) 100 1.5 8,000.00 1,200,000.00

Total Direct Loss* 9,474,000.00

* Total direct losses were computed only for one year.

XII

Udakaravita

Horangala

Nivithigala

Ratnapura

Sabaragamuwa

XIII

2. Landslide: Horangala (Nivithigala DSD, Ratnapura District)

Introduction

This damage assessment and drone survey report is on the landslide occurred in Udakaravita area

(Horangala GND, Nivithigala DSD, Ratnapura District, Sabaragamuwa Province) on May 26, 2017 at

0655 hrs. This report is developed bases on the data and information collected in the field and

drone survey conducted on site.

Name of the Village : Udakaravita

GND : Horangala

DSD : Nivithigala






XIV



300m

XV




Landslide type Landslide



Crown Width 90 m

Crown Height 25 m

Initiation Area length 28m

Maximum Width 63 m



Slope Type Concave


Deposited Area Slope Angle 2.5 deg

Erosion Type Straight


XVI


Landslide hazard layer (Sheet no. 7521) of this area is not available.

XVII





Start Position 80.4118743855, 6.5841779446


End Position 80.4133436194, 6.5817755739

End Height -18.369 m

Path Length 318.78 m






Minimum Elevation on Path -18.41 m


Azimuth 148° 33' 2.1"

Slope/Tilt -20.47°



as 0 meter)

XVIII



Start Position 80.4121598130, 6.5830276345


End Position 80.4125782302, 6.5832237676

End Height 9.07 m









Azimuth 64° 53' 7.6"

Slope/Tilt 2.58°



as 0 meter)

XIX


In the location, before landslide its main landuse is tea, rubber and paddy uses. Other information

of location as follows;



Slope type Concave


Deposited area slope Angle 2.50



Number of Deaths Not Recorded


Fully Damaged Buildings Not Recorded

Partially Damaged Buildings 05




Tea (ha) 1.13 1500 kg/ha/year 600.00 1,017,000.00

Rubber (ha) 0.44 2800kg crepe/ha/year 300.00 369,600.00

Paddy (ha)* 0.268 3763 kg/ha/yr/season 40.00 80,678.72

*Note: Paddy is grown in Sri Lanka twice annually

Total estimated crop loss 1,467,278.72



Houses* (Partially damaged)

160 10,000.00 5 8,000,000.00

*Note: In Horanagala it is observed 05 partially damaged houses. However their degree of exposure to the landslide is higher due to the geographic position.

Transport Infrastructure

Length (m) width (m) Cost per (m2) Total Loss (Rs)

Road (concrete) 45 1.5 4,000.00 270,000.00

Road (Main)* 100 3 500.00 150,000.00

*Note: The main road is not damaged. The cost for 1m2 road area indicates the labor and machinery costs for clearing the landslide debris on the road.



XXI

Wanniwatta

Wanniwatta

Nivithigala

Ratnapura

Sabaragamuwa

XXII

3. Landslide: Wanniwatta (Nivithigala DSD, Ratnapura District)

Introduction

This damage assessment and drone survey report is on the landslide occurred in Wanniwatta area

(Wanniwatta GND, Nivithigala DSD, Ratnapura District, Sabaragamuwa Province) on May 26, 2017

at 0750 hrs. This report is developed bases on the data and information collected in the field and


Name of the Village : Wanniwatta

GND : Wanniwatta, 175

DSD : Nivithigala






XXIII



580m

XXIV







Crown Width 150 m

Crown Height 25 m

Initiation Area length 27-30 m

Maximum Width 98 m



Slope Type Terraced


Deposited Area Slope Angle 1-2 deg



XXV


XXVI





Start Position 80.5118506928, 6.6065583810


End Position 80.5105508384, 6.6032303410

End Height 21.426 m









Azimuth 201° 20' 2.1"

Slope/Tilt -15.20°



as 0 meter)

XXVII



Start Position 80.5107571645, 6.6050006189


End Position 80.5114380406, 6.6046003463

End Height 63.581 m









Azimuth 120° 27' 3.9"

Slope/Tilt 6.02°



as 0 meter)

XXVIII


In the location, before landslide its main landuse is tea, rubber, arecanut and cocunut uses. Other

information of location as follows;



Slope type Terraced


Deposited area slope Angle 1-20



Number of Deaths 26

Injuries 04

Fully Damaged Buildings 07





Coconut 80 5600 nut/year 50.00 280,000.00

Arecanut 40 40000 nut/year 105.00/100nuts 42,000.00

Rubber 50 350kg 300.00 105,000.00

Timber Value of Rubber

50 50 trees 3,500.00/tree 175,000.00

Pepper 200 200 500.00

100,000.00

Jack fruit 10 45 50.00 2,250.00

For 1 ha total loss 704,250.00

Estimated mixed crop area buried under landslide is 2.24 ha 1,577,520.00


Tea (ha) 1.5 1500 kg/ha/year 600.00 1,350,000.00

Expected loss over 10 year period by losing 1ha Tea land 13500000.00


Houses* 160 10,000.00 15 24,000,000.00

*Note: In Wanniwatta it is observed 07 fully damaged houses and 08 partially damaged houses. However the degree of exposure of the partially damaged houses are nearly 1 or 100%. Therefore they were considered as fully damaged.

Transportation Length (m) width (m) Cost per (m2) Total Loss (Rs)

Road (concrete) 300 2 4,000.00 2,400,000.00

Road (Tar) 70 3 1,800.00 378,000.00



XXIX

Neluwankanda

Begotuwa, 177/A

Nivithigala

Ratnapura

Sabaragamuwa

XXX

4. Landslide: Neluwankanda (Nivithigala DSD, Ratnapura District)

Introduction

This damage assessment and drone survey report is on the landslide occurred in Neluwankanda

area (Begotuwa (177/A) GND, Nivithigala DSD, Ratnapura District, Sabaragamuwa Province) on

May 26, 2017 at 0730 hrs. This report is developed bases on the data and information collected in

the field and drone survey conducted on site.

Name of the Village : Neluwankanda

GND : Begotuwa, 177/A

DSD : Nivithigala






XXXI



300m

XXXII







Crown Width 110 m

Crown Height 30 m

Initiation Area length 25 m

Maximum Width 60 m



Slope Type Concave





XXXIII


XXXIV

ANALYSIS ON ALONG LANDSLIDE FLOW PATH (LONGITUDI NAL PROFILE)




Start Position 164024.959, 148763.520


End Position 163973.717, 148669.198

End Height -6.019 m









Azimuth 208° 28' 36.6"

Slope/Tilt -18.83°



as 0 meter)

XXXV



Start Position 163992.221, 148725.076


End Position 164022.150, 148714.797

End Height 14.703 m









Azimuth 108° 55' 1.8"

Slope/Tilt 4.55°



as 0 meter)

XXXVI


In the location, before landslide its main landuse is tea and coconut uses. Other information of

location as follows;

Land use management Well Managed


Slope type Concave









Infrastructure Damages Road, Electricity, Communication



Coconut (0.53 ha) 50 3500 nut/year 50.00 175,000.00

Tea (ha) 0.288 1500 kg/ha/year 600.00 259,200.00

Total estimated crop loss 434,200.00


Area of

Building (m2) Construction cost/m2

(Rs) # of houses Total Loss (Rs)

Houses* (Fully damaged) 160 10,000.00 3 4,800,000.00

Transport Infrastructure Length (m) width (m) Cost per (m2) Total Loss

Road (concrete) 60 1.5 4000.00 360,000.00



XXXVII

Ambalanpitiya

Ambalanpitiya

Dehiowita

Kegalle

Sabaragamuwa

XXXVIII

5. Landslide: Ambalapitiya (Dehiowita DSD, Kegalle District)

Introduction

This damage assessment and drone survey report is on the landslide occurred in Ambalanpitiya

area (Ambalanpitiya GND, Dehiowita DSD, Kegalle District, Sabaragamuwa Province) on May 26,

2017 at 0715 hrs. This report is developed bases on the data and information collected in the field

and drone survey conducted on site.

Name of the Village : Ambalanpitiya

GND : Ambalanpitiya

DSD : Dehiowita

District : Kegalle





XXXIX



195m

XL






Date of inspection May 31, 2017

Crown Width 42 m

Crown Height 18 m


Maximum Width 62 m



Slope Type Concave





XLI



XLII







End Position 6° 52' 33.9349" N, 80° 16' 36.8008" E

End Height 2.733 m









Azimuth 197° 36' 25.4"

Slope/Tilt -17.25°



as 0 meter)

XLIII





End Position 6° 52' 36.6574" N, 80° 16' 38.4456" E

End Height 24.131 m









Azimuth 113° 28' 0.2"

Slope/Tilt -4.92°



as 0 meter)

XLIV


In the location, before landslide its main landuse is Rubber trees. Current land value is Rs. 15,000.00

per perch. Other information of location as follows;

Land use management Human impacted


Slope type Concave

Initiation area Slope Angle 20-22 0











Rubber (ha) 1.2 2800kg crepe/ha/year 300.00 1,008,000.00



Length (m) width (m) Cost per (m2) Total Loss

Road (minor) 90 3.5 5000.00 1,575,000.00

Road (Gavel) 67 2.5 500.00 83,750.00



XLV

Diddeniya Pahala

Pathberiya

Kuruwita

Ratnapura

Sabaragamuwa

XLVI

6. Landslide: Diddeniya (Kuruwita DSD, Rathnapura District)

Introduction

This damage assessment and drone survey report is on the landslide occurred in Diddeniya Pahala

area (Pathberiya GND, Kuruwita DSD, Ratnapura District, Sabaragamuwa Province) on May 26,



Name of the Village : Diddeniya Pahala

GND : Pathberiya

DSD : Kuruwita

District : Rathnapura





XLVII


Width at Middle: 94m


363m

XLVIII







Crown Width 96 m

Crown Height 30 m


Maximum Width 94 m



Slope Type Concave


Deposited Area Slope Angle 8 deg



XLIX



L







End Position 6° 50' 20.7063" N, 80° 19' 17.2938" E

End Height 77.731 m

Path Length 275 m

Straight-Line Distance 264 m

3D Distance on Surface 319 m


Total Climbing 9.2 m over 78 m on surface

Total Descending 96.8 m over 241 m on surface



Azimuth 244° 17' 9.2"

Slope/Tilt -18.34°



as 0 meter)

LI





End Position 6° 50' 20.7063" N, 80° 19' 23.1037" E

End Height 95.018 m

Path Length 102 m








Azimuth 149° 45' 23.4"

Slope/Tilt 3.48°



as 0 meter)

LII


In the location, before landslide its main landuse is a forest. Other information of location as

follows;



Slope type Concave

Initiation area Slope Angle 45-50 0

Deposited area slope Angle 80




Injuries 03





Crop Value per (ha) Total Loss (Rs)

Forest Area (2.4) 920,000.00 2,208,000.00


Area of Building (m2)

Construction cost/m2

# of houses Total Loss (Rs)

Houses (Fully damaged)

160 10000.00 3 4,800,000.00


Length (m) width (m) Cost per (1m2) Total Loss (Rs)

Road (minor) 125 4 4000.00 2,000,000.00

Road (minor)* 44.2 1.8 4000.00 318,240.00



LIII

Thalawitiya

Maheengoda

Eheliyagoda

Ratnapura

Sabaragamuwa

LIV

7. Landslide: Thalawitiya (Eheliyagoda DSD, Rathnapura District)

Introduction

This damage assessment and drone survey report is on the landslide occurred in Thalawitiya area

(Maheengoda GND, Eheliyagoda DSD, Ratnapura District, Sabaragamuwa Province) on May 26,



Name of the Village : Thalawitiya

GND : Maheengoda

DSD : Eheliyagoda






LV




103m

LVI







Crown Width 33 m

Crown Height 30 m


Maximum Width 41 m



Slope Type Concave





LVII



LVIII







End Position 6° 50' 23.3302" N, 80° 17' 02.6435" E

End Height 0.589 m

Path Length 107 m








Azimuth 203° 04' 58.7"

Slope/Tilt -22.15°



as 0 meter)

LIX





End Position 6° 50' 24.9483" N, 80° 17' 04.0535" E

End Height 22.168 m

Path Length 39 m








Azimuth 110° 16' 47.3"

Slope/Tilt 3.02°



as 0 meter)

LX


In the location, before landslide its main landuse is Rubber plantation. Other information of




Slope type Concave





Number of Deaths 12

Injuries 02





Area (ha) Total yield Unit Price

(Rs) Total Loss (Rs)

Rubber (ha) 0.3 2800kg

crepe/ha/year 300.00 252,000.00

Timber Value of Rubber

400 trees/ha 120 trees 3,500.00/tre

e 420,000.00


*Note the expected loss over 10 year period, consists production loss only. Not timber value

Area of Building

(m2) Construction

cost/m2 # of houses Total Loss (Rs)

Houses* 160 10,000.00 6 9,600,000.00

*Note: In Thalavitiya it is observed 04 fully damaged houses and 02 partially damaged houses. However the degree of exposure of the partially damaged houses are nearlly 1 or 100%. Therefore they were considered as fully damaged in the damage assessment.


Length (m) width (m) Cost per

(1m2) Total Loss (Rs)

Road (minor) 70 2.2 4,000.00 616,000.00



LXI

Arabbada

Palpitiya

Eheliyagoda

Ratnapura

Sabaragamuwa

LXII

8. Landslide: Arabbada (Eheliyagoda DSD, Rathnapura District)

Introduction

This damage assessment and drone survey report is on the landslide occurred in Arabbada area

(Palpitiya GND, Eheliyagoda DSD, Ratnapura District, Sabaragamuwa Province) on May 26, 2017 at

0530 hrs. This report is developed bases on the data and information collected in the field and


Name of the Village : Arabbada

GND : Palpitiya

DSD : Eheliyagoda






LXIII




421m

LXIV







Crown Width 28 m

Crown Height 23 m


Maximum Width 79 m



Slope Type Concave





LXV


Landslide hazard layer (Sheet no. 6713 & 6718) of this area is not available.

LXVI







End Position 6° 51' 55.0289" N, 80° 14' 47.2784" E

End Height -4.148 m

Path Length 435 m








Azimuth 76° 40' 47.9"

Slope/Tilt -19.46°



as 0 meter)

LXVII





End Position 6° 51' 53.0198" N, 80° 14' 40.7756" E

End Height 17.466 m

Path Length 52 m








Azimuth 348° 29' 33.3"

Slope/Tilt -3.60°



as 0 meter)

LXVIII


In the location, before landslide its main landuse is Rubber plantation. Other information of




Slope type Concave











Total yield Unit Price (Rs) Total Loss (Rs)

Rubber (ha) 2 2800kg crepe/ha/year 300.00 1,680,000.00

Timber Value of Rubber 400 trees/ha 800 trees 3500.00/tree 2,800,000.00

Expected loss over 10 year period* 16,800,000.00

*Note the expected loss over 10 year period, consists production loss only. Not timber value

Transport Infrastructure Length (m) width (m) Cost per (1m2) Total Loss (Rs)

Road (concrete) 110 2.5 4,000.00 1,100,000.00



LXIX

Annexure 2: Informative drone survey orthomosaic map

contents...1 contents introduction 2 base concept on damage assessment & drone survey 2...

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