1.2 Detalhes do contato das pessoas capacitadas e instituições envolvidas na avaliação e documentação da tecnologia

Nome do projeto que facilitou a documentação/avaliação da Tecnologia (se relevante)

Programme d’Appui à l’agriculture Productive (GIZ / PROMAP)

Nome da(s) instituição(ões) que facilitou(ram) a documentação/ avaliação da Tecnologia (se relevante)

Deutsche Gesellschaft für Internationale Zusammenarbeit (GIZ) GmbH (GIZ) - Alemanha

Nome da(s) instituição(ões) que facilitou(ram) a documentação/ avaliação da Tecnologia (se relevante)

Misereor - Alemanha

1.3 Condições em relação ao uso da informação documentada através de WOCAT

Quando os dados foram compilados (no campo)?

01/07/2012

O/a compilador/a e a(s) pessoa(s) capacitada(s) aceitam as condições relativas ao uso de dados documentados através da WOCAT:

Sim

2.1 Descrição curta da tecnologia

Definição da tecnologia:

Contour stone bunds are erosion control structures and improve water retention and infiltration into the soil, resulting in an increased harvest.

2.2 Descrição detalhada da tecnologia

Descrição:

Contour stone bunds are erosion control structures built with quarry rock or stones in series of two or three. They are constructed in lines along the natural contour of the land after 10-15 cm of the soil has been removed from the line where they are to be built. They should be built to a height of 20-30 cm from the ground and spaced 20 to 50 m apart depending on the inclination of the terrain.
The best results are achieved when contour stone bunds are used in combination with biological measures (planting of grass, trees and hedges) and the use of organic fertiliser and mulching.

Purpose of the Technology: Contour stone bunds protect the land against sheet erosion caused by runoff. They form a barrier that slows down runoff and spreads it more evenly over the land. By slowing the flow of water over the land, it can seep into the soil and prevents the loss of rainwater. The bunds also act as a filter, trapping fine waterborne particles of soil and manure, resulting in a build-up of sediment and the formation of terraces. The seeds of grasses and shrubs are also trapped by the bunds, favouring the establishment of natural vegetation along the structure. This further stabilises the soil and the bunds and contributes to conserving the biodiversity of plants and small wild animals (monitor lizards, birds, snakes and other reptiles). If good vegetation cover is developed on the stone bunds, they also lower soil temperature and provide protection against wind erosion. Excess water filters through the bunds and infiltrates into the soil. When rainfall is erratic, the stone bunds contribute to conserving more moisture in the soil for longer, which helps to alleviate water stress during dry spells. There is evidence that bunds that have been in place for over 15 years have positive effects on yields.

Establishment / maintenance activities and inputs: A minimum amount of upkeep is required, which essentially involves replacing stones dislodged by animals or water flow. The lifespan of a stone bund is over 20 years.
In order to optimise the positive effects of stone bunds, it is important to ensure that they are constructed closely following the natural contour of the land and in accordance with the established technical standards.
The means of transport required depends on the proximity of a quarry or a supply of stones (cart or lorry).

Natural / human environment: This technique is designed for cropland, but can also be used on forest/rangeland. It is suitable for areas in the Sahel and the Sudan with rainfall ranging between 300 and 900 mm/year and low-to-medium gradient terrain.
When rainfall is high, they protect the land in the event of heavy rain, a phenomenon that tends to increase with climate change.

2.3 Fotos da tecnologia

2.5 País/região/locais onde a tecnologia foi aplicada e que estão cobertos nesta avaliação

2.6 Data da implementação

Caso o ano exato seja desconhecido, indique a data aproximada:

• 10-50 anos atrás

2.7 Introdução da tecnologia

Especifique como a tecnologia foi introduzida:

• através de projetos/intervenções externas

Comentários (tipos de projeto, etc.):

Known as traditional method in some areas. Improved and up-scaled as part of numerous projects in many semi-arid countries. German Developmenmt Cooperation has used the technology from the 1980s onwards to combat desertification and improve natural resource management e.g. PDRT (Projet de développement rural de Tahoua - Tahoua Rural Development Project), PASP (Projet de protection intégrée des ressources agro-sylvo-pastorales Tillabéri-Nord - Project for the Integrated Protection of Agricultural, Forest and Rangeland Resources in Tillabéri-Nord) and several other projects of GIZ/KfW and other donors.

3.1 Principal/principais finalidade(s) da tecnologia

• Reduz, previne, recupera a degradação do solo

3.2 Tipo(s) atualizado(s) de uso da terra onde a tecnologia foi aplicada

Comentários:

Major land use problems (compiler’s opinion): surface runoff, erosion by water and wind, fertility decline,

Nomadism: Yes

Semi-nomadism / pastoralism: Yes

Cut-and-carry/ zero grazing: Yes

Improved pasture: Yes

Other grazingland: agropastoralism

Selective felling of (semi-) natural forests: Yes

Forest products and services: timber, fuelwood, fruits and nuts, grazing / browsing, other forest products / uses (honey, medical, etc.)

Type of cropping system and major crops comments: farmers are mainly agropastoralists with some communities specialised on pure pastoralism

Constraints of common grazing land

Constraints of forested government-owned land or commons

3.3 Mais informações sobre o uso da terra

Abastecimento de água para a terra na qual a tecnologia é aplicada:

• Precipitação natural

Comentários:

Water supply: Also mixed rainfed - irrigated and post-flooding

Número de estações de cultivo por ano:

• 1

Especifique:

Longest growing period in days: 120; Longest growing period from month to month: August to October

Densidade animal (se relevante):

1-10 LU /km2

3.4 Grupo de GST ao qual pertence a tecnologia

• Medidas de curva de nível

3.5 Difusão da tecnologia

Especifique a difusão da tecnologia:

• Uniformemente difundida numa área

Caso a tecnologia seja uniformemente difundida numa área, indique a área coberta aproximada:

• > 10.000 km2

Comentários:

Large-scale areas have been protected in most Sahel countries. German Development Cooperation (BMZ/GIZ/KfW) for example has had several projects in Chad, Burkina Faso, Niger, Mali, Benin, which have applied stone bunds on around 800.000 to 1.000.000 ha since the 90ies.

3.6 Medidas de GST contendo a tecnologia

3.7 Principais tipos de degradação da terra abordados pela tecnologia

Comentários:

Secondary types of degradation addressed: Et: loss of topsoil

Main causes of degradation: soil management (Unadapted landuse methods, reduced or abandoned fallow periods), crop management (annual, perennial, tree/shrub) (Neglect of fallow periods and crop rotation), droughts (due to heat waves and unreliable rainfall), population pressure (rapidly growing population increasing pressure on land), land tenure (insecure access to land and collectively managed communal land), poverty / wealth (very poor population)

Secondary causes of degradation: deforestation / removal of natural vegetation (incl. forest fires) (deforestation through overgrazing and fire wood collection), over-exploitation of vegetation for domestic use (firewood collection), overgrazing (cattle, sheep and goats), change in temperature (Climate change: heat waves), change of seasonal rainfall (more variable onset of rain), Heavy / extreme rainfall (intensity/amounts) (more variable and intensive rains), wind storms / dust storms (frequent storms), floods (due to intensive rain storms), labour availability (some migration of men to nearby cities), education, access to knowledge and support services (high level of illiteracy)

3.8 Redução, prevenção ou recuperação da degradação do solo

Especifique o objetivo da tecnologia em relação a degradação da terra:

• Recuperar/reabilitar solo severamente degradado

Comentários:

Secondary goals: prevention of land degradation, mitigation / reduction of land degradation

4.1 Desenho técnico da tecnologia

4.2 Especificações técnicas/ explicações do desenho técnico

Contour stone bunds are built with quarry rock or stones in series of two or three. They are constructed in lines along the natural contour of the land after 10-15 cm of the soil has been removed from the line where they are to be built. They should be built to a height of 20-30 cm from the ground and spaced 20 to 50 m apart. The best results are achieved when contour stone bunds are used in combination with biological measures (planting of grass, trees and hedges) and the use of organic fertiliser and mulching.

Technical knowledge required for field staff / advisors: moderate

Technical knowledge required for land users: low

Main technical functions: control of dispersed runoff: retain / trap, control of dispersed runoff: impede / retard, control of concentrated runoff: retain / trap, control of concentrated runoff: impede / retard, stabilisation of soil (eg by tree roots against land slides), increase of infiltration, increase / maintain water stored in soil, water harvesting / increase water supply

Secondary technical functions: reduction of slope angle, improvement of ground cover, increase in nutrient availability (supply, recycling,…), increase of groundwater level / recharge of groundwater, sediment retention / trapping, sediment harvesting, reduction in wind speed, increase of biomass (quantity)

Bund/ bank: graded
Spacing between structures (m): 20-50
Height of bunds/banks/others (m): 0.2-0.3
Length of bunds/banks/others (m): 0.2

Material: Stone

4.3 Informação geral em relação ao cálculo de entradas e custos

Especifique a moeda utilizada para os cálculos de custo:

• Dólares norte-americanos

4.4 Atividades de implantação

	Atividade	Tipo de medida	Periodicidade
1.	Levelling and marking out the contour lines	Estrutural
2.	collecting stones and loading them onto carts	Estrutural
3.	transporting the stones by cart	Estrutural
4.	constructing the bunds	Estrutural
5.	applying manure	Estrutural

4.5 Custos e entradas necessárias para a implantação

	Especifique a entrada	Unidade	Quantidade	Custos por unidade	Custos totais por entrada	% dos custos arcados pelos usuários da terra
Mão-de-obra	Levelling and construction of bunds	ha	1,0	19,32	19,32
Equipamento	Tools	ha	1,0	1,95	1,95
Outros	Transport of stones	ha	1,0	15,07	15,07
Custos totais para a implantação da tecnologia					36,34

4.6 Atividades recorrentes/manutenção

	Atividade	Tipo de medida	Periodicidade/frequência
1.	Replacing stones dislodged by animals or water flow	Estrutural

4.8 Fatores mais importantes que afetam os custos

Descreva os fatores mais determinantes que afetam os custos:

The exact cost per hectare of constructing stone bunds depends on the distance of the site from the quarry, the size of the quarry, the inclination of the terrain, which determines the spacing between the stone bunds, and the actual amount of stones transported in each lorryload. The prices below are provided as a guide.
Supply of quarry rock/stones: 24 m3 per 400 m of bund
Labour: 30 man-days per ha
• levelling and marking out the contour lines: 1 man-day
• collecting stones and loading them onto carts:
10 man-days
• transporting the stones by cart: 10 man-days
• constructing the bunds: 9 man-days
• applying manure.
Transportation by cart:
• 20 cartloads of stones
• 20 cartloads of manure (if used).
Transportation by lorry:
• 6 lorryloads (skip loader – 4.5 m3 per load).
Other costs: equipment (pickaxes, shovels, wheelbarrows, water-tube level, etc.).

5.1 Clima

5.2 Topografia

Comentários e outras especificações sobre a topografia:

Landforms: Also footslopes and valley floors

Altitudinal zone: 200 m a.s.l.

5.3 Solos

Caso disponível anexe a descrição completa do solo ou especifique as informações disponíveis, p. ex. tipo de solo, PH/acidez do solo, nitrogênio, capacidade de troca catiônica, salinidade, etc.

Soil texture (topsoil): Fine to medium (sandy to clayey loams)

5.4 Disponibilidade e qualidade de água

Comentários e outras especificações sobre a qualidade e a quantidade da água:

Ground water table: > 10 m

Availability of surface water: Surface runoff generated by limited but intense rainfalls

5.5 Biodiversidade

5.6 Características dos usuários da terra que utilizam a tecnologia

Indique outras características relevantes dos usuários da terra:

Population density: 10-50 persons/km2

Annual population growth: 3% - 4%

(mostly poor households below poverty line).

Off-farm income specification: men migrate temporarily or permanently to cities for off-farm income, women and men seasonally carry out paid farm work

Market orientation of production system: Most households crop for subsistence (mainly for small agropastoralists) and surplus is sold on market (medium agropastoralists). Commercial markets: some vegetable growing and pastoralists.

Level of mechanization: Ox and donkey used for animal traction

5.7 Média da área de terra própria ou arrendada por usuários da terra que utilizam a tecnologia

5.8 Propriedade de terra, direitos de uso da terra e de uso da água

Propriedade da terra:

• Estado
• Comunitário/rural

Direitos do uso da terra:

• Comunitário (organizado)
• Indivíduo

Comentários:

traditional land use rights prevail. On fields individual land use rights, communal rights on pasture and forest land (collection of wood and other products (fruits, medicinal plants))

Land ownership: Also individual not titled

5.9 Acesso a serviços e infraestrutura

6.1 Impactos no local mostrados pela tecnologia

Impactos socioeconômicos

Produção

Disponibilidade e qualidade de água

Renda e custos

Impactos socioculturais

Impactos ecológicos

Ciclo hídrico/escoamento

Solo

Biodiversidade: vegetação, animais

Clima e redução de riscos de desastre

Outros impactos ecológicos

6.2 Impactos externos mostrados pela tecnologia

6.3 Exposição e sensibilidade da tecnologia às mudanças climáticas graduais e extremos/desastres relacionados ao clima (conforme o ponto de vista dos usuários da terra)

Mudança climática gradual

Mudança climática gradual

	Estação do ano	Tipo de mudança climática/extremo	Como a tecnologia lida com isso?
Temperatura anual		aumento	bem

Extremos (desastres) relacionados ao clima

Desastres meteorológicos

	Como a tecnologia lida com isso?
Temporal local	não bem
Tempestade de vento local	bem

Desastres climatológicos

	Como a tecnologia lida com isso?
Seca	bem

Desastres hidrológicos

	Como a tecnologia lida com isso?
Inundação geral (rio)	não bem

Outras consequências relacionadas ao clima

Outras consequências relacionadas ao clima

	Como a tecnologia lida com isso?
Período de crescimento reduzido	não conhecido

6.4 Análise do custo-benefício

Como os benefícios se comparam aos custos de implantação (do ponto de vista dos usuários da terra)?

Como os benefícios se comparam aos custos recorrentes/de manutenção(do ponto de vista dos usuários da terra)?

6.5 Adoção da tecnologia

Entre todos aqueles que adotaram a tecnologia, quantos adotaram espontaneamente, ou seja, sem receber nenhum incentivo material/pagamentos?

• 50-90%

Comentários:

Comments on acceptance with external material support: While in emergency programs erosion control structures are mostly implemented through cash/food for work this is not the case in natural resource programs. As concerns German Development Cooperation, cash/food for work has been used during the 80ies and 90ies to implement stone bunds. Thereafter most programs switched to a voluntary approach where only Tools and transport were provided but all labour has been provided by the beneficiaries without payment.

80% of land user families have adopted the Technology without any external material support

There is a little trend towards spontaneous adoption of the Technology

Comments on adoption trend: The success of this measure and implementation on a wide scale depend to a large extent on whether grants are available to cover the cost of transporting the stones required to the site, good community organisation and the capacity of the community to mobilise the necessary labour, the contribution required from the farmers.
The farmers’ commitment to implementing the measure largely depends on whether they are allowed to choose the sites to be improved in their area. Forcing them to begin the improvement work upstream, as dictated by the traditional watershed development approach, has often proved counterproductive. Most communities prefer to improve individual plots first in order to achieve immediate effects on crop production and leave the treatment of forest/ rangeland areas as a second step.

6.7 Pontos fortes/vantagens/oportunidades da tecnologia

Pontos fortes/vantagens/oportunidades na visão do/a compilador/a ou de outra pessoa capacitada
There is evidence that bunds that have been in place for over 15 years have positive effects on yields. Grain yields increase by more than 40% for millet up to 15 years after the bunds were established, and there is no evidence to suggest that yields decline with time. This can be explained by improved soil structure, which increases infiltration, even after the bunds are completely silted up.
The lifespan of a stone bund is over 20 years. There is a progressive build-up of sediment behind the bunds, resulting in the formation of terraces. Although the capacity of the bunds to retain water declines as the sediment builds up, soil infiltration capacity increases, thanks to improved soil structure, and the slope becomes gentler thanks to the terracing effect. How can they be sustained / enhanced? Farmers can maintain water retention capacity by raising the height of the existing bunds. In some places, farmers take the stones from the original bunds when a ridge of vegetation has been established and use them to form new bunds between the old ones.
The decrease in surface runoff in the treated area reduces the flow of floodwater and the amount of sediment carried by the water downstream, thereby protecting the fertile land in the valley bottoms from siltation and gully erosion. How can they be sustained / enhanced? In order to optimise the positive effects of stone bunds, it is important to ensure that they are constructed closely following the natural contour of the land and in accordance with the established technical standards.
In dry years, while unimproved land produces nothing, land protected by stone bunds can still produce a harvest. How can they be sustained / enhanced? When stone bunds are used in combination with zai planting pits, sorghum yields can increase by 114-124%. When used in conjunction with the application of the right amount of organic fertiliser, sorghum yields can be doubled.
Higher crop production improves household food security in proportion to the area of a farm improved with bunds. Under the PASP in Niger, an average of 16% of the area of a farm was improved with stone bunds, resulting in an increase of between 8% and 33% in annual output with no other additional measures.

6.8 Pontos fracos, desvantagens/riscos da tecnologia e formas de superá-los

Pontos fracos/vantagens/riscos na visão do/a compilador/a ou de outra pessoa capacitada	Como eles podem ser superados?
In wet years, the bunds may cause waterlogging in some parts of the field, which can adversely affect some crops.	If this happens, farmers must open up a gap in the bunds to drain off the water.

7.3 Links para informação relevante que está disponível online

Título/ descrição:

Good Practices in Soil and Water Conservation. A contribution to adaptation and farmers resilience towards climate change in the Sahel. Published by GIZ in 2012.

URL:

http://agriwaterpedia.info/wiki/Main_Page