1.3 Conditions regarding the use of data documented through WOCAT

When were the data compiled (in the field)?

10/10/2002

The compiler and key resource person(s) accept the conditions regarding the use of data documented through WOCAT:

Yes

2.1 Short description of the Technology

Definition of the Technology:

It is a stone wall embankment along the contour with land leveling in between two terrace walls to control erosion.

2.2 Detailed description of the Technology

Description:

The traditional Konso Bench Terraces are established by building up stone embarkments along the contour and gradually levelling the land in between risers. Levelling is done actively and by siltation processes. Stone walls have to be enhanced periodically. The appearance of the technology evolves over time from stone empankments to bench terraces. The stone walls are supported on the downslope side by trees and / or legumes including coffee, pigeon pea, etc.

Purpose of the Technology: The purpose of the structures is to break the slope length and reduce run-off concentration thereby controlling erosion, increasing water stored in soil and harvesting eroded sediments.

Establishment / maintenance activities and inputs: Terraces have a long tradition in the area, and farmers are specialists in construction of stone walls. The first step during terrace establishment is to dig foundation up to 30 cm. Then stone walls are gradually built up to an impressive height of 1.5-2m above ground. The technology is very labour intensive: establishment takes 5 years and bi-annual maintenance is required. However, it is worth the effort, since without terracing crop production would not be thinkable in a marginal area characterised by shortage and high variability of rainfall, shallow, stony soils on steep slopes, high levels of soil erosion and (thus) frequent food shortages.

Natural / human environment: Social systems for labour-sharing and voluntary assistance have evolved to manage heavy labour inputs. Multiple cropping is practised for rist aversion. Growing leguminous crops helps to further improve soil fertility. Additional water harvesting measures are needed to further raise yields.

2.3 Photos of the Technology

2.5 Country/ region/ locations where the Technology has been applied and which are covered by this assessment

2.6 Date of implementation

If precise year is not known, indicate approximate date:

• more than 50 years ago (traditional)

2.7 Introduction of the Technology

Specify how the Technology was introduced:

• as part of a traditional system (> 50 years)

Comments (type of project, etc.):

Traditionally practiced since long time (Inhereted from ancestors)

3.2 Current land use type(s) where the Technology is applied

Comments:

Major land use problems (compiler’s opinion): Land shortage, moisture stress, soil fertility decline, shallow soil depth, high cost of farm inputs and pest attack.

Major land use problems (land users’ perception): Low rainfall, land shortage, pest and high price of fertilizers

Type of cropping system and major crops comments: Sorghum/maize, oil crops, peas

3.3 Further information about land use

Water supply for the land on which the Technology is applied:

• rainfed

Number of growing seasons per year:

• 2

Specify:

Longest growing period in days: 70

Longest growing period from month to month: Mar - May

Second longest growing period in days: 50

Second longest growing period from month to month: Aug - Oct

3.5 Spread of the Technology

Specify the spread of the Technology:

• evenly spread over an area

If the Technology is evenly spread over an area, indicate approximate area covered:

• 1,000-10,000 km2

Comments:

Konso Bench practice started over 400 years ago (Elders interview) and it is practiced through out sloping lands in Konso Woreda.

3.6 SLM measures comprising the Technology

Comments:

Main measures: structural measures

Secondary measures: vegetative measures

Type of agronomic measures: better crop cover, early planting

3.7 Main types of land degradation addressed by the Technology

Comments:

Main type of degradation addressed: Wt: loss of topsoil / surface erosion

Secondary types of degradation addressed: Cn: fertility decline and reduced organic matter content, Ha: aridification

Main causes of degradation: other human induced causes (specify) (Agricultural causes), other natural causes (avalanches, volcanic eruptions, mud flows, highly susceptible natural resources, extreme topography, etc.) specify, poverty / wealth (Lack of captial)

Secondary causes of degradation: labour availability (Lack of labour)

3.8 Prevention, reduction, or restoration of land degradation

Specify the goal of the Technology with regard to land degradation:

• reduce land degradation
• restore/ rehabilitate severely degraded land

Comments:

Main goals: mitigation / reduction of land degradation

Secondary goals: rehabilitation / reclamation of denuded land

4.2 Technical specifications/ explanations of technical drawing

Technical knowledge required for field staff / advisors: moderate

Technical knowledge required for land users: moderate

Main technical functions: increase / maintain water stored in soil

Secondary technical functions: reduction of slope angle, sediment retention / trapping, sediment harvesting

Construction material (earth): The earth used for supporting the wall on the up slope part

Construction material (stone): The stone is used to form wall of the bench

If the original slope has changed as a result of the Technology, the slope today is: 0%

Lateral gradient along the structure: 0%

Vegetation is used for stabilisation of structures.

4.3 General information regarding the calculation of inputs and costs

other/ national currency (specify):

Ethiopian Birr

Indicate exchange rate from USD to local currency (if relevant): 1 USD =:

8.50

4.4 Establishment activities

	Activity	Type of measure	Timing
1.	Survey (traditional)	Structural	dry season
2.	Stone collection	Structural	dry season
3.	Digging foundation	Structural	dry season
4.	Soil sealing & land leveling	Structural	dry season
5.	Constructions of stone wall	Structural	dry season

4.5 Costs and inputs needed for establishment

Comments:

Duration of establishment phase: 60 month(s)

4.6 Maintenance/ recurrent activities

	Activity	Type of measure	Timing/ frequency
1.	Stabilizing by putting additional stones	Structural	after rain/once a year
2.	The stone wallsupported by soil	Structural	after rain/once a year
3.	Planting on the bench	Structural	during the rain/once a year
4.	Land preparation	Agronomic	dry season / 2-3
5.	Land preparation	Agronomic	dry season / 2-3
6.	Land preparation	Agronomic	dry season / 2-3

4.7 Costs and inputs needed for maintenance/ recurrent activities (per year)

Comments:

On the basis of kilometers treated per hectar
Remarks: Duration of establishment phase is 5 years. Land users maintain the terrace at least twice a year, mainly while preparing the land for crops. Labour inputs for maintainance are usually 25-30% of construction. Daily wage of hired labour is about US$ 1; material costs include collection and sizing of stones.

4.8 Most important factors affecting the costs

Describe the most determinate factors affecting the costs:

Labour, farm implements, soil workability, surface stoniness

5.1 Climate

5.2 Topography

5.3 Soils

5.6 Characteristics of land users applying the Technology

Indicate other relevant characteristics of the land users:

Land users applying the Technology are mainly common / average land users

Population density: 50-100 persons/km2

Annual population growth: 2% - 3%

60% of the land users are average wealthy and own 60% of the land.
25% of the land users are poor and own 35% of the land.
15% of the land users are poor and own 5% of the land.

Off-farm income specification: No considerable difference

5.7 Average area of land owned or leased by land users applying the Technology

5.8 Land ownership, land use rights, and water use rights

Land ownership:

• state

Land use rights:

• individual

6.1 On-site impacts the Technology has shown

Socio-economic impacts

Production

Income and costs

Socio-cultural impacts

Ecological impacts

Water cycle/ runoff

Soil

6.2 Off-site impacts the Technology has shown

6.3 Exposure and sensitivity of the Technology to gradual climate change and climate-related extremes/ disasters (as perceived by land users)

Gradual climate change

Gradual climate change

	Season	Type of climatic change/ extreme	How does the Technology cope with it?
annual temperature		increase	well

Climate-related extremes (disasters)

Meteorological disasters

	How does the Technology cope with it?
local rainstorm	well
local windstorm	well

Climatological disasters

	How does the Technology cope with it?
drought	well

Comments:

Tolerant to climatic extremes (e.g. rain storms). Water conservation effect increases resilience to periods of water stress.

6.4 Cost-benefit analysis

How do the benefits compare with the establishment costs (from land users’ perspective)?

How do the benefits compare with the maintenance/ recurrent costs (from land users' perspective)?

Comments:

La marge bénéficiaire est très faible, mais sans terrasses, pas de cultures possibles. Les exploitants continueront à investir dans des terrasses tant qu’ils pourront en tirer un moyen d’existence

6.5 Adoption of the Technology

Comments:

10% of land user families have adopted the Technology with external material support

Comments on acceptance with external material support: survey results

90% of land user families have adopted the Technology without any external material support

Comments on spontaneous adoption: estimates

There is a strong trend towards spontaneous adoption of the Technology

Comments on adoption trend: The technology is over 400 years old and it is already adopted

6.8 Weaknesses/ disadvantages/ risks of the Technology and ways of overcoming them

Weaknesses/ disadvantages/ risks in the land user’s view	How can they be overcome?
Les terrasse nécessitent un entretien très fréquent, ce qui rend cette technologie très exigeante en main-d’œuvre	utiliser de plus grosses pierres lors de la construction ; éviter le pâturage libre (les animaux endommagent les structures)

Weaknesses/ disadvantages/ risks in the compiler’s or other key resource person’s view	How can they be overcome?
The terraces require very frequent maintenance which makes the technology highly labour-demanding.	Use bigger stones for construction; avoid free grazing (animals damage the structures).

7.2 References to available publications

Title, author, year, ISBN:

Danano, D. 2008 (unpublished). Soil and Water Conservation Practices for Sustainable Land Management in Ethiopia. Ethiocat.