1.2 Contact details of resource persons and institutions involved in the assessment and documentation of the Technology

Name of project which facilitated the documentation/ evaluation of the Technology (if relevant)

The Transboundary Agro-ecosystem Management Project for the Kagera River Basin (GEF-FAO / Kagera TAMP )

Name of the institution(s) which facilitated the documentation/ evaluation of the Technology (if relevant)

Food and Agriculture Organization of the United Nations (FAO) - Italy

1.3 Conditions regarding the use of data documented through WOCAT

When were the data compiled (in the field)?

05/12/2013

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:

Rain-water from all corrugated iron roof structures in one compound is harvested and stored in underground tanks.

2.2 Detailed description of the Technology

Description:

Despite high precipitation (>1200 mm), Rubagano still experiences water shortage. It is hilly, with steep (>30%) to very steep (>58%) slopes. Rain water runs off to the valleys below, causing erosion and damaging infrastructure such as roads along its course. There is little rain water infiltration and the ground water level low. The few boreholes that government constructed in the area are often dry. Therefore women and children normally walk distances of up to 4 km to fetch water which, in many cases, is actually runoff dammed behind a concrete wall built across an open rock patch. To alleviate water scarcity, farmers have been mobilized by Kagera TAMP project to harvest the rain water from their own roofs. Because water sources are far from most households, rooftop water harvesting has a very high utility for the farmers. Adoption is high.

Purpose of the Technology: The primary goal of the technology is to increase household water availability. It also reduces runoff, produces water for the tree nursery and backyard gardens..

Establishment / maintenance activities and inputs: Requirements for harvesting water on an iron roof are water collection gutters and an underground tank. Rain falling on the roof flows into collection gutters constructed around the roof which angle gently away from the house and end at one or more underground tanks. Excavation and construction of the storage tank is costly and requires well qualified artisans. These are trained locally and are available within the community to minimize costs. The underground tank is constructed by excavating the ground between 3.0 m and 3.5 m deep and 2.0 m to 2.5 m diameter. Thus, a small tank will have a capacity of 38,000 litres (38 cubic metres). The bottom and walls of the pit is then built up throughout with brick and mortar. The top is a concrete slab with 2 openings of 0.3 m diameter, one connected to the gutters and the other through which a plastic container is lowered to fetch water. Though establishment costs appear high for farmers, the longer term benefits outweigh the original cost. Once established the maintenance costs are limited to periodic cleaning.

Natural / human environment: Heavy rainstorms may blow the gutters out of position.

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:

• less than 10 years ago (recently)

2.7 Introduction of the Technology

Specify how the Technology was introduced:

• through projects/ external interventions

3.1 Main purpose(s) of the Technology

• improve production
• adapt to climate change/ extremes and its impacts

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

Comments:

Major land use problems (compiler’s opinion): Loss of vegetation, soil erosion and very low ground water level. Difficulty in finding access to water for domestic use, livestock and crop irrigation.

Major land use problems (land users’ perception): Women and children walk very long distances in search of water from permanent natural wells.

3.3 Further information about land use

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

• rainfed

Specify:

Longest growing period in days: 120 Longest growing period from month to month: September to December Second longest growing period in days: 90 Second longest growing period from month to month: February to May

3.4 SLM group to which the Technology belongs

• water harvesting

3.5 Spread of the Technology

Comments:

Total area covered by the SLM Technology is 0.001 m2.

3.6 SLM measures comprising the Technology

Comments:

Main measures: structural measures

3.7 Main types of land degradation addressed by the Technology

Comments:

Main type of degradation addressed: Hs: change in quantity of surface water, Hp: decline of surface water quality

Main causes of degradation: soil management (Removal of vegetation cover), deforestation / removal of natural vegetation (incl. forest fires) (Forests harvested for fuel wood, charcoal, agriculture etc.), other natural causes (avalanches, volcanic eruptions, mud flows, highly susceptible natural resources, extreme topography, etc.) specify (Steep slopes increase the speed of runoff and soil erosion)

Secondary causes of degradation: change of seasonal rainfall (Climate change effects of human activity), droughts (Longer dry spells as a result of climatic changes), poverty / wealth (Cannot afford manure or fertilizers to make soil more productive so forest is cut to create more agricultural land)

3.8 Prevention, reduction, or restoration of land degradation

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

• reduce land degradation

4.1 Technical drawing of the Technology

4.2 Technical specifications/ explanations of technical drawing

Details of rainwater harvesting system: roof catchment, gutters and underground storage tank

Location: Rubagano, Mwizi Sub-county, Mbarara District. Uganda

Date: 18 December 2013

Technical knowledge required for field staff / advisors: moderate

Technical knowledge required for land users: low (Artisan's work once the land user has decided on the size of the water tank required)

Main technical functions: water harvesting / increase water supply

Secondary technical functions: control of dispersed runoff: retain / trap, control of concentrated runoff: drain / divert, water spreading

Dam/ pan/ pond
Depth of ditches/pits/dams (m): d=3.0
Width of ditches/pits/dams (m): r=2.0
Length of ditches/pits/dams (m): n/a

Specification of dams/ pans/ ponds: Capacity 38m3

Catchment area: 900 m2m2

Beneficial area: 900 m2m2

For water harvesting: the ratio between the area where the harvested water is applied and the total area from which water is collected is: 1:0.1

4.3 General information regarding the calculation of inputs and costs

other/ national currency (specify):

UGX

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

2500.0

4.4 Establishment activities

	Activity	Type of measure	Timing
1.	Tank construction	Structural	Throughout the year
2.	Procurement and raising of collection gutters	Structural	Throughout the year
3.	Wooden poles	Structural	Throughout the year

4.5 Costs and inputs needed for establishment

	Specify input	Unit	Quantity	Costs per Unit	Total costs per input	% of costs borne by land users
Labour	Labour	ha	1.0	500.0	500.0	100.0
Equipment	Tools	ha	1.0	30.0	30.0	100.0
Construction material	Wood	ha	1.0	16.0	16.0	100.0
Construction material	Bricks	ha	1.0	400.0	400.0	100.0
Construction material	Cement	ha	1.0	420.0	420.0	100.0
Construction material	Sand	ha	1.0	160.0	160.0	100.0
Total costs for establishment of the Technology					1526.0

Comments:

Duration of establishment phase: 2 month(s)

4.6 Maintenance/ recurrent activities

	Activity	Type of measure	Timing/ frequency
1.	Tank maintenance (above ground)	Structural	Once a year
2.	Gutter replacement	Structural	Twice a year
3.	Wooden poles	Structural	Twice a year

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

	Specify input	Unit	Quantity	Costs per Unit	Total costs per input	% of costs borne by land users
Labour	Labour	ha	1.0	80.0	80.0	100.0
Equipment	Tools	ha	1.0	10.0	10.0	100.0
Construction material	Wood	ha	1.0	4.0	4.0	100.0
Construction material	Bricks	ha	1.0	40.0	40.0	100.0
Construction material	Cement	ha	1.0	42.0	42.0	100.0
Construction material	Sand	ha	1.0	40.0	40.0	100.0
Total costs for maintenance of the Technology					216.0

Comments:

Machinery/ tools: Pick-axe, hand hoe, panga

The calculations were done for a 38.0 cubic meter tank constructed in September 2013

4.8 Most important factors affecting the costs

Describe the most determinate factors affecting the costs:

Skilled labor for the construction of the underground tank

5.1 Climate

5.2 Topography

Comments and further specifications on topography:

Altitudinal zone: 1501-2000 m a.s.l (Ranked 1, rubagano has an average altitude of 1700 m a.s.l) and 1001-1500 m a.s.l. (ranked 2)

5.3 Soils

If available, attach full soil description or specify the available information, e.g. soil type, soil PH/ acidity, Cation Exchange Capacity, nitrogen, salinity etc.

Soil fertility: Low (ranked 1) and medium (ranked 2)
Soil drainage/infiltration: Medium
Soil water storage capacity: Medium (ranked 1) and low (ranked 2)

5.4 Water availability and quality

5.5 Biodiversity

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%
1% of the land users are very rich and own 10% of the land.
15% of the land users are rich and own 20% of the land.
80% of the land users are average wealthy and own 65% of the land (Have an iron roof house, some livestock and land for cultivation).
4% of the land users are poor and own 5% of the land.
Off-farm income specification: Similar statistics for all types of land users as far as off-farm income is concerned
Level of mechanization: Manual work (All land is cultivated manually)
Market orientation of production system: Mixed (ranked 1, most farmers cultivate banana plantations for subsistence and commercial use) and subsistence (ranked 2, a few farmers cultivate for subsisce)

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:

• individual, not titled

Land use rights:

• individual

Water use rights:

• open access (unorganized)

5.9 Access to services and infrastructure

6.1 On-site impacts the Technology has shown

Socio-economic impacts

Production

Water availability and quality

Income and costs

Socio-cultural impacts

Ecological impacts

Water cycle/ runoff

Soil

Biodiversity: vegetation, animals

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	not well

Hydrological disasters

	How does the Technology cope with it?
general (river) flood	well

Other climate-related consequences

Other climate-related consequences

	How does the Technology cope with it?
reduced growing period	well

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:

The technology may appear expensive to the farmer at the time of establishment but it is cost-effective in the long-term.

6.5 Adoption of the Technology

If available, quantify (no. of households and/ or area covered):

25

Of all those who have adopted the Technology, how many have did so spontaneously, i.e. without receiving any material incentives/ payments?

• 50-90%

Comments:

20% of land user families have adopted the Technology with external material support

5 land user families have adopted the Technology with external material support

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

20 land user families have adopted the Technology without any external material support

There is a moderate trend towards spontaneous adoption of the Technology

Comments on adoption trend: Regardless of the high costs involved, improved water security has encouraged farmers to adapt the technology.

6.7 Strengths/ advantages/ opportunities of the Technology

Strengths/ advantages/ opportunities in the compiler’s or other key resource person’s view
Makes water for drinking and domestic use more readily available to the household How can they be sustained / enhanced? Encourage adoption and maintenance through farmer-to-farmer information
Saves women and children from walking long distances in search of clean water How can they be sustained / enhanced? Empower women and children to demand and obtain rooftop water harvesting at home
Rooftop harvested water is cleaner than trapped runoff used by many members of the community How can they be sustained / enhanced? Help households to acquire materials for rooftop water harvesting

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

Weaknesses/ disadvantages/ risks in the compiler’s or other key resource person’s view	How can they be overcome?
Technology is expensive to establish	Support government and private sector to subsidize tanking systems for farmers
Requires technical expertise especially in concrete preparation to prevent cracks and leakages	Ensure farmers who express the need to adapt get access to construction technicians

7.2 References to available publications

Title, author, year, ISBN:

Kagera TAMP project website

Available from where? Costs?

www.fao.org/nr/kagera/en