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WATER

Affected areas

Types of damage

Restoring the capacity

background

Salt affected lands assessment

Sketching impacts of the tsunami on paddy fields

RESTORING THE CAPACITY

Types of rehabilitation/remediation

Rehabilitation options and costs for agricultural lands will depend on severity and extent of

Banda Aceh South Overview
© DigitalGlobe
Click to view larger image

damage and salinisation and on the capacity to flush out salts and re-establish irrigation and drainage.

Reclamataion should also address agrobiodiversity and other environmental issues and land use potentials (wetlands, recreation etc).

There is a need to study maps of irrigated areas and extent of damage and of soil type and terrain to assess salinity damage.

Banda Aceh South Overview before tsunami © DigitalGlobe
Click to view larger image

High resolution global irrigation maps from IWMI (jpg images) seem to show no irrigation in coastal areas in Aceh and North Sumatra, none or almost none in Thailand affected areas (the Thai Government estimates affected agricultural land at 225 ha only - this may not include plantations).

This suggests a concentration of likely effects in South-Eastern India, West Coast and the middle of Southern Coast of Sri Lanka (excluding consideration of lagoon systems).


Short-term

Intensification of agriculture on most productive lands, adjacent to the damaged areas, over the coming season.

Rehabilitation of agricultural lands with little damage through re-levelling and where salts will be naturally flushed from topsoil by the seasonal monsoon rains (Indonesia, Thailand) or easily leached (sandy soils, functioning and substantial water supply and energy).

Replacement/repair of damaged farm irrigation systems. Open wells used for potable and irrigation supply may need to be pumped out and disinfected. Repair of damaged tail ends and drainage in large irrigation schemes.

Reclamation of coastal lagoons and deltas that can be easily repaired through clearing of blocked drainage channels

Integrated Strategy of water management oriented towards restoration of affected agro-aqua-ecosystems. During the coming months the low part of the watershed needs additional water allocation and improved management to clean up agricultural lands and coastal groundwater and surface aqua-systems.

Medium to long-term

Intensification of agriculture on most productive lands, adjacent to the damaged areas, over the coming season.

Rehabilitation of agricultural lands with little damage through re-levelling and where salts will be naturally flushed from topsoil by the seasonal monsoon rains (Indonesia, Thailand) or easily leached (sandy soils, functioning and substantial water supply and energy).

Replacement/repair of damaged farm irrigation systems. Open wells used for potable and irrigation supply may need to be pumped out and disinfected. Repair of damaged tail ends and drainage in large irrigation schemes.

Reclamation of coastal lagoons and deltas that can be easily repaired through clearing of blocked drainage channels

Integrated Strategy of water management oriented towards restoration of affected agro-aqua-ecosystems. During the coming months the low part of the watershed needs additional water allocation and improved management to clean up agricultural lands and coastal groundwater and surface aqua-systems.

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WATER

ANIMALS

PLANTS

SOIL

Publications

FAO Field guide:The impact of salt water on agricultural land in Aceh Province.

The use of saline waters for crop production

Soil salinity assessment: methods and interpretation of electrical conductivity measurements

Water quality for agriculture

Related links

Water Resources, Development and Management website

 contact: tsunami@fao.org

© FAO, 2005