Associated Rehabilitation Projects in the Indian Ocean Islands · 2018. 10. 16. · Introduction...
Transcript of Associated Rehabilitation Projects in the Indian Ocean Islands · 2018. 10. 16. · Introduction...
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Mine & Associated RehabilitationProjects in
Africa & the Indian Ocean Islandsby
Roley NöffkeTVNI (The Vetiver Network International)
&IECA (Region2-Southern Africa Chapter)
&Hydromulch (Pty) Ltd
Johannesburg,Republic of South Africa
E-mail: info @hydromulch.co.za
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Introduction
Mining and associated rehabilitation projects in Africaand the Indian Ocean Islands have been successfullyimplemented jointly under the guidance and auspices of“The Vetiver Network International (TVNI) and theInternational Erosion Control Association (IECA) as a resultof the interaction that has developed between the twoorganisations in Africa and on the Indian Ocean Islands.
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Itisrecordedthatpractically95%of the53countriesontheentireAfrican continent(includingIslands)has successfullyimplementedtheVetiver Systemforsoil&waterconservation duringthepast200years. Ashortoverviewofprojectsinthe followingcountrieswillbegiven, illustratingcurrentactivitiesusingthe Vetiversystem: 1.DemocraticRepublicofCongo 2.Ethiopia 3.Congo-Brazzaville 4.Congo-PointeNoire/Brazzaville 5.Guinea 6.Gabon 7.MadagascarA&B 8.SouthAfrica. Thepresentationwillreflectthemajor stridesthathavebeenachievedin erosion&sedimentcontrol,bio- engineering&vegetationrestoration andtheparticipationoflocal communitiesingeneral.
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Project No. 1 -Selembao Project, Democratic Republic of Congo
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Collapsed bridges and urbanroads preventing access toproperties
Abandoned homes & properties
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The Selembao Construction Site - 2006
Construction commenced in 2004
A world Bank financed project for therehabilitation of the erosion gully in thedistrict of Selembao, Kinshasa, DRC
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Construction was carried out by a Congolese company Matla Forrest. Extensive Delays resulted in theVetiver planting taking place during the dry season with limited available water. Financial constraintslimited the planting of Vetiver hedge rows at spacings closer than 4 metre intervals along contours.
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A total of 11.5 hectares was planted to Vetiver and thereafterhydroseeded using locally harvested and commercial seed.
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Excessive erosion of the drain in the primary catchment area as a result of under-designedcollector drains silting up and displacing storm water directly onto the unprotected side slopes
Silted Drains – Cause of excessive surfacewater runoff down side slopes
Vetiver planted Green TerraMesh Walls
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Sand Bags inter-planted with Vetiver was used to repair the extensive erosion caused by surface water runoff
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Correct method
Incorrect method
Installation of Sand Bags
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Sand Bag Reinforced & Stabilised Gully
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80,000 Sand Bags were used forthe stabilisation of the erosiongullies. Vetiver grass was plantedinto the Sand Bags.
The project where TVNI & Hydromulch
formed a established working relationship • Dr. Paul Truong• Dr. Dale Rachmeler • Eng Alain Ndona • Roley Noffke
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Sporadic Veld Fires during the dry season
Recovered Green TerraMesh walls
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SLUFDebela Dinka Guda251 91 186 6766August 2013
Project No. 2 - Vetiver System Applications, Ethiopia
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Since the establishment of the Ethiopian Vetiver
Network (ETVN) in 2009, the VS technology is
considered as one of the best biological
conservation inputs by government (MoA & ERA) &
non-government organizations, farmers & private
investors for sustainable land management (SLM)
programme.
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NATIONAL WORKSHOP ORGANIZED BY SLUF & TVNI,ADDIS ABABA, ETHIOPIA, 2009
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NATIONALWORKSHOP WORKINGCOMMITTEE ADDISABABA ETHIOPIA,2009
NATIONALWORKSHOP DELEGATES
ADDISABABA ETHIOPIA,2009
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Vetiver Applications in Community Farming Projects in Ethiopia
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Vetiver System in Maize Fields
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Handicrafts Urban Are as
Roadside Embankments
Canals
Vetiver Applications
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Training of EthiopianRoad Authority Engineers
organized by SLUF & TVNI
Elise Pinners-TVNI Kenya
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National & International Co-OperationEthiopian Ministry of Agriculturehas taken the VS as part of itssustainable land management programs
Ethiopian Roads Authority(ERA) has included the VS forthe rehabilitation of all road contracts
Madagascar
Thailand
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Policy DialogueThe Ethiopian President, EEPCO, ERA & MoA
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Ethiopia’s way forward:
1. Extensive promotion of the VS for wider uses throughout the country.
2. Exploring the use of VG for various uses e.g. handicrafts, perfume, etc.
3. Promoting the VS in schools and higher education institutions.
4. Engaging in National and International Networking.
Vetiver is a Proven GREEN Solution!
USE IT!!
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Project No.3 - Boukeni Erosion Gully Project, Brazzaville, Congo
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&
gullies
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Construction is by a Brazilian Company-ANDRADE Gutierez SA.The consultant Engineers for the project -EGIS-INTERNATIONAL.Environmental & Bio-Engineering design, supervision andimplementation - Engineer Alain NDONA (TVNI).
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Constructionactivitiesandfinishingoffofsideslopesinprogressonnewlyconstructeddrainagesystem
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• • • • •
Length of gullies : ± 600 m¹Length of drains or canals : ± 800 m¹, 50-60 meters wide and 20-40 meter deepSurface area planted to Vetiver – ± 36,000 m² per channelPlanting density - 1 m between rows and 10 plants/m¹Vetiver sourced from local community
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Implementation of the Vetiver System on side slopes of Canal Construction
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Vegetated Side Slopes of Concrete Drainage Channel
Engineer Alain NDONA (TVNI)
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Project No. 4 - The Pointe Noire to Brazzaville Highway, Congo
Total length of road: ± 600 kmPlanned to plant 120 million Vetiver, slips sourced mainly fromCHINA .On site nursery constructed: 5ha .
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Side Slope Rehabilitation in progress
45° slope angle with benching at 10 m intervals on average .
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Highly dispersive and erodible side slope material
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Construction by a Chinese company - China State Construction Engineering Corporation LTD (CSCEC).The consultant Engineers for the project- EGIS-INTERNATIONAL.Environmental & Bio-Engineering design and supervision - Engineer Alain NDONA.Setting out & Planting of vetiver hedge rows
1 m¹ between rows and 10 plants/m¹
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StableSideSlopeEstablishedwithVetiverSystem
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Stable SideSlopeEstablishedwithVetiverSystem
Vetiver Planted to date: 50,000 m¹.45° slope angle with benching at 10 m intervals on average .
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Project No. 5 - The Rio Tinto Project- Simandou, Guinea
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Rehabilitation of the highest point of Pic du Fon, Simandou, Guinea
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InstallationofBio-EngineeringTechniques&HydroseedingonExplorationSiteforprotectionofchimpanzeehabitat
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Iveco 6x6 HydroSeeder on Site
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Placing of Bio-Jute on steep side slopes around Drill Pads
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Bio-Jute Preparation
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Installation of Bio-Jute Netting
Bio-JuteInstallationandVetiverplantingonCutSlopeEmbankments
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Established Vetiver & Hydroseeded Slope
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On-Going Stabilisation work on Access Roads along the Montane area
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Anglo Ashanti Gold mine in Guinea where the VS is starting up
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Illegal Mining Activities on and around the Mine
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Delivery of Vetiver Grass from Mine Nursery
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Vetiver Grass Slips planted in well constructed furrows or rows at Anglo Ashanti Gold
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Project No. 6 - OLAM Gabon Special Economic Zone, Nkok, Gabon
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GSEZ Nkok, Gabon540 ha of tropical junglesituated on the Equatorremoved in one operationfor industrial developmentresulting in a civil andenvironmental disasterwith only 20 ha side slopesrehabilitated in Phase 1
Work Undertaken• 30,000 m¹ vetiver grasshedge rows
• Bio-Jute – 10,000 m²• Silt fences - 3,600 m¹• Sand Bags – 2,500 m¹• Hydroseeding -200,000 m²
Climatic ConditionsAnnual rainfall + 3700mm 2 Rainy seasons –September to December & May to July
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The Impact of 750 mm rain in 24 hours
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Excessive Erosion caused by surface water runoff
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&–
slope
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&
Hydroseeding
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Effective use of Silt fences to protect Vetiver (VS) in early stages of growth
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Established Side Slopes using Vetiver (VS) & Hydroseeding
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Madagascar- ProjectsProjects 7 A – Rio Tinto/QMM Ilmenite Mine
Projects 7 B – Sherritt Mining Ambatovy Pipeline
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LocationofRioTinto&SherrittMining ProjectinMadagascar
Rio Tinto Ilmenite Project
Antananarivo
Sherritt Mining Ambatovy Project
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Local Malagasy Community
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Typical Malagasy Mode of Transport
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The Selembao project in Kinshasa, DRC Project No. 7 A - Ilmenite Project, Madagascar
2007 Mining site
Ehoala Dune Cut
New Harbour
Quarry
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Vetiver Sources• Vetiver plant material was sourced from surrounding areas within
a 50 km radius.
• No planting material was imported or introduced from outsideareas.
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Local Villagers
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VetiverPurchasesfromVillagers
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Community Vetiver Propagation
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Andre & Auguste Mahalogny family from the Mangaiky Village .
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Maria Agnes family Operation
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Environmental work Started in 2006 with 15 communities, expanded to 32communities by 2008.40 hectares were stabilised and re-vegetated.4,000,000 Vetiver plants were propagated & supplied by local villagers.Assisted in setting up Vetiver nurseries and provided the necessary trainingof the local communities.
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Planting of Vetiver Grass Hedge Rows on the Ehoala Dune
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Locally trained supervisors implementing “Coastal Dune Sand Migration” Control
Local Fishing Village
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Impact of Prevailing Winds - Primary Dune
Prevailing wind direction(In excess of 35 days withintense gusting up to45 knots at times)
Wind Damaged planted areas
Note -Vetiver root system
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Surface Water Runoff control with Vetiver Hedge Rows
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Established & Stable Ehoala Dune – 9 ha in extent
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Project No. 7 B – Ambatovy Project, Moramanga to Tamatave, Madagascar
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Installed Erosion Control Structures & Hydroseeding
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• • • •
Length of ROW: 220 KilometresArea rehabilitated – 550 hectaresRehabilitation period: 3 yearsVetiver plants & fascines sourcedfrom local communities
Progressive Rehabilitation ofPipeline ROW (Right of Way)
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Functional Erosion Control Structures & Established HydroSeeding
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Rehabilitation of extremely difficultrock sections through mountain terrain - ROW (Right of Way)
• • •
Accessible only via access roadsOften inaccessible for up to 2months due to weather conditionsUnstable cut slopes rehabilitated byVetiver plants & fascines sourcedfrom local communities
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Rehabilitated fill side slopes & stabilised shoulder break point
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Project No. 8 - Donga Rehabilitation, South AfricaIn Association with the Department of Agriculture, Limpopo Province, South Africa
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Tubatse Class – February 2012
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Donated Vetiver Plants – Feb 2012
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Tubatse Class – February 2012
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In-Field Training on soil conservation techniques on degraded area in Tubatse, Limpopo Province, RSA
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Community training in setting outof contours and Vetiver planting techniques – Feb 2012
Pre-grown Vetiver plants weresupplied for the training program
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Established Vetiver plants grazed & damaged by domestic animals – July 2012
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Established Vetiver plants grazed by domestic animals – May 2013
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Vetiver planting techniques in Gullies – Feb 2012
July 2012
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Gully established with Vetiver grass – May2013
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Malomanye Village – August 2012
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Malomanye Village On Site Training – August 2012
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Preparation of Vetiver Slips
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–
2012
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Malomanye Village On-Site Training – August 2012
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VegetatedDongasatMalomanyeVillage–May2013
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Moutse Village Community Training at Hydromulch Training Centre – April 2013
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Moutse Village Community Field Training – April 2013
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Moutse Village Community Field Training – April 2013
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MoutseVillageDongaRehabilitation–April2013
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Moutse Village Donga Rehabilitation – April 2013
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Moutse Village Donga Rehabilitation Maintenance – May 2013
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In Conclusion
TVNI and the IECA are strategically positioned toprovide the international platform through which
degraded areas can be restored such that SustainableLand Management can be achieved over time.
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We always seem to have aPLAN B
but we forget that there is“No”
PLANET BThe correct application of soil conservation andbio-diversity principles & techniques remains
fundamental to our survival.It is our responsibility to preserve and protect the
environment we live in.Thank you