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)

Manual of Good Practices in Small Scale Irrigation in the Sahel (GIZ )

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

Deutsche Gesellschaft für Internationale Zusammenarbeit (GIZ) - Alemanha

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

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

Sim

1.4 Declaração de sustentabilidade da tecnologia descrita

A tecnologia descrita aqui é problemática em relação a degradação da terra de forma que não pode ser declarada uma tecnologia de gestão sustentável de terra?

Não

1.5 Referência ao(s) questionário(s) sobre abordagens GST (documentado(s) usando WOCAT)

2.1 Descrição curta da tecnologia

Definição da tecnologia:

Village irrigation schemes (VISs) help to control the water supply and significantly increase yields.

2.2 Descrição detalhada da tecnologia

Descrição:

Village irrigation schemes (VISs) are a concept and a development typology created in the 1970s and 80s. Using a relatively simple development concept, it was possible to create production units that were built and managed by local people in areas seriously affected by drought and a sharp decline in inundation events in the 1970s and 80s. Instead of being dependent on food aid, local people operating a VIS were able to guarantee sufficient rice production to cover their village’s food needs. With one pumping facility and one canal network installed, it is possible to control the water supply for an area of at least 20 hectares, thus creating the required conditions for intensive rice growing.

Prior to the installation of the scheme, the sites are not suitable for rice growing. Yields significantly increase as a result of the work carried out. An average harvest of six tonnes per hectare increases incomes. With an average price of 125 CFA francs per kilo of paddy, the rate of sales reaches 750,000 CFA francs per hectare. The surplus per hectare is estimated at 300,000 CFA francs.

A VIS comprises a pumping station, small-scale facilities infrastructure, and irrigation and drainage networks. The pumping station consists of a pump unit fitted with a diesel motor with two or three 28 to 38 horse-power cylinders and a centrifugal pump with a capacity of 350 to 480 cubic metres per hour. The pump is positioned right alongside the water source (river, lake) and is mounted on a mobile chassis so it can be repositioned as and when required
and depending on the situation of the water source, which can vary considerably during the winter growing season. At the end of the growing season, the pump unit can be stored in a secure, weather-proof location (out of the sun, rain, etc.). Water is then pumped through a flexible hose of reinforced polyethylene (the lengths generally being multiples of 50 metres, but no longer than 150 metres) up into the delivery basin where the energy carried in the turbulent pumped water is dissipated to prevent erosion damage and where the flow is calmed from turbulent to laminar. From the delivery basin onwards, the system makes use of gravity to feed its open canal network. The majority of the network is comprised of earthen structures, with only a section of the main canal being lined (usually a length of between 150 to 300 metres leading from the delivery basin outflow). The secondary and/or tertiary canals are supplied with water through a division box that apportions supply using a system of (‘all or nothing’) gates. Plots are watered from the tertiary canal by turning on the PVC hose.
Initially, villagers are able to express their need for a VIS through a village diagnostic exercise. This installation request is then taken up by the communes’ PDESC. A formal request is then referred to the mayor and drawn up by the community. The support structure (PMN/IPRODI) reviews the request and carries out a preliminary feasibility study. Decisions are then taken in a planning workshop on which schemes to prioritise. Following this, private planning consultants are commissioned to conduct feasibility studies. In parallel, technical and financial analyses are carried out by the programme’s planners, who also validate the studies. A meeting is held to inform and raise the awareness of the beneficiary communities about the development approach. The community is then requested to contribute their labour as part of the HLIW measures. The financial contribution required for the pump unit is up to 30% of its cost.

Farming a VIS (intensive rice growing) is fundamentally different to other, more traditional production systems to which farmers are accustomed (extensive rice growing in floodplains and millet growing in non-flooded areas). VISs require the purchase of inputs and the sale of at least part of the produce. Farming a VIS requires the development and good functioning of a value chain with many more links upstream and downstream of production and beyond the confines of the village than would be found in a traditional system. Although the VIS was initially conceived as a drought response mechanism in the 1970 and 80s, VIS farming encourages farmers to become more integrated in the rural and regional economy.

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.):

Since 1997, by PMN/IPRODI

3.1 Principal/principais finalidade(s) da tecnologia

• Melhora a produção
• Preserva ecossistema

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

Uso do solo misturado dentro da mesma unidade de terra:

Sim

Especificar o uso misto da terra (culturas/ pastoreio/ árvores):

• Agropecuária (incl. agricultura e pecuária)

Comentários:

Major land use problems (compiler’s opinion): Prior to the installation of the scheme, the sites are not suitable for rice growing.
Livestock density: 1-10 LU /km2

3.4 Abastecimento de água

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

• Misto de precipitação natural-irrigado

3.5 Grupo de GST ao qual pertence a tecnologia

• Gestão de irrigação (inclusive abastecimento de água, drenagem)
• Desvio e drenagem de água
• Gestão de água de superfície (nascente, rio, lagos, mar)

3.6 Medidas de GST contendo a tecnologia

Comentários:

Specification of other management measures: irrigation schemes

3.7 Principais tipos de degradação da terra abordados pela tecnologia

Comentários:

Main causes of degradation: over abstraction / excessive withdrawal of water (for irrigation, industry, etc.)

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

4.1 Desenho técnico da tecnologia

4.2 Informação geral em relação ao cálculo de entradas e custos

Outro/moeda nacional (especifique):

CFA Franc

Se for relevante, indique a taxa de câmbio do USD para moeda local (por exemplo, 1 USD = 79,9 Real): 1 USD =:

517,0

4.3 Atividades de implantação

	Atividade	Periodicidade (estação do ano)
1.	formal request for irrigation scheme
2.	support structure (PMN/IPRODI) reviews the request and carries out a preliminary feasibility study
3.	Decisions are then taken in a planning workshop on which schemes to prioritise
4.	private planning consultants are commissioned to conduct feasibility studies
5.	In parallel, technical and financial analyses are carried out by the programme’s planners
6.	meeting is held to inform and raise the awareness of the beneficiary communities about the development approach
7.	community is then requested to contribute their labour

4.4 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
Outros	total construction	ha	1,0	2497,0	2497,0	100,0
Custos totais para a implantação da tecnologia					2497,0
Custos totais para o estabelecimento da Tecnologia em USD					4,83

4.5 Atividades recorrentes/manutenção

	Atividade	Periodicidade/frequência
1.	Regularly maintaining the facilities and networks
2.	Agricultural advisory support and monitoring of crops by the technical services

4.7 Fatores mais importantes que afetam os custos

Descreva os fatores mais determinantes que afetam os custos:

The development costs are estimated at 1.3 million CFA francs per hectare (2,497 Dollar).
On the technical side, numerous scheme configurations have been observed. The most common involves a limited number of small-scale distribution control structures and a network of open, earthen canals. This type of scheme requires an investment in the order of between 1 and 1.5 million CFA francs per hectare. It also fosters the large-scale participation of villagers in all the building works, particularly excavation work and the installation of plots. At the other end of the spectrum are the VISs that have lined canals throughout their entire irrigation network. These require much more substantial investment (up to 7 or 8 million CFA francs per hectare) and building works (including plot installation) are generally carried out by contractors. As yet, no study has indicated that the yields and technical lifespan of such high-cost ‘sophisticated’ schemes are greater than those of ‘basic’ schemes.

5.1 Clima

5.2 Topografia

5.3 Solos

5.4 Disponibilidade e qualidade de água

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 persons/km2
Annual population growth: 2% - 3%
10% of the land users are rich.
50% of the land users are average wealthy.
30% of the land users are poor.
10% of the land users are very poor.

5.7 Área média de terrenos utilizados pelos usuários de terrenos que aplicam a Tecnologia

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

Comentários:

The irrigated land is allocated by the chief

5.9 Acesso a serviços e infraestrutura

6.1 Impactos no local mostrados pela tecnologia

Impactos socioeconômicos

Produção

Renda e custos

Impactos socioculturais

Impactos ecológicos

Ciclo hídrico/escoamento

Solo

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	aumento ou diminuição	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	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)	bem

Outras consequências relacionadas ao clima

Outras consequências relacionadas ao clima

	Como a tecnologia lida com isso?
Período de crescimento reduzido	bem

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

Comentários:

The community is requested to contribute their labour as part of the HLIW measures. The financial contribution required for the pump unit is up to 30% of its cost
There is a moderate trend towards spontaneous adoption of the Technology
On the back of over 15 years’ work and major investments, the programme has been able to develop 489 VISs across an intervention area that covers six circles (second-tier government structures). While most of the VISs grow in-season rice (July to December), 10% grow rice off season and 20%, located mainly in the Diré area, grow wheat (October to March). A small percentage of VISs (around 2%) grow two crops a year. The reasons for this low percentage are the risks involved and clashes in the growing calendar. Many of the pump units are, however, used several times over (on different sites for different crops).

6.7 Pontos fortes/vantagens/oportunidades da tecnologia

Pontos fortes/vantagens/oportunidades na visão do usuário da terra
Option for scheme extensions to be undertaken by the beneficiaries themselves

Pontos fortes/vantagens/oportunidades na visão do compilador ou de outra pessoa capacitada
Yields significantly increase
Building more sustainable and less costly schemes through the careful configuration of irrigation canals
Low investment costs
Existence of 15-year-old schemes that are still productive and in good condition
Possibility for beneficiaries to replace spent pump units using their own savings

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

Pontos fracos/vantagens/riscos na visão do compilador ou de outra pessoa capacitada	Como eles podem ser superados?
scheme areas may become a source of conflict

7.1 Métodos/fontes de informação

7.2 Referências às publicações disponíveis

Título, autor, ano, ISBN:

Manual of Good Practices in Small Scale Irrigation in the Sahel. Experiences from Mali. Published by GIZ in 2014.

Disponível de onde? Custos?

http://star-www.giz.de/starweb/giz/pub/servlet.starweb

Título, autor, ano, ISBN:

IPRODI (2009): Approche du PMN pour le développement de l’irrigation de proximité, region de Tombouctou [North Mali Programme’s approach to developing small-scale irrigation in the Timbuktu region].