The plastic pipe running from the roof to the concrete tank. (S. Stevenson (Camp kuhiston))

Roof Top Rain Water Harvesting - Concrete Tank (Tajikistan)

Чамоварии оби борон

Description

The roof top rain water harvesting system using a concrete tank was designed to improve household access to water for irrigation of kitchen garden plots during the hot and dry summer months.

A 16 cubic metre concrete tank situated in the shadow of the house constructed to retain rainwater that collects in the roof guttering.

Purpose of the Technology: The purpose of the tank is to retain water to be used for drinking, sanitation and irrigation during the hot and dry summer months. The retained water allows for the irrigation of kitchen garden plots and more diverse crops, and hence should improve the livelihoods of households involved.

Establishment / maintenance activities and inputs: There are three main elements to the construction of the rainwater harvesting system. The first is the construction of a metal gutter on wooden supports around the perimeter of the roof; second, the construction of a concrete pool in the shadow of the house; and finally the provision of a connection pipe between the gutter and the pool. The pool needs to be cleaned periodically to prevent contamination and build up of algae around the edge the pool.

Natural / human environment: During the Soviet period the water supply for the village was supplied through a concrete storage tank located at the foot of the hills above the village. After the collapse of the Soviet Union the concrete tank and its associated infrastructure fell into disrepair. As a result the inhabitants were faced with water shortages, especially during the hot dry summers. In response to this issue the residents invested time, finance and resources into constructing rainwater collection systems.

Location

Location: Rudaki, Boshkengash, Tajikistan, Tajikistan

No. of Technology sites analysed:

Geo-reference of selected sites
  • 68.7127, 38.412

Spread of the Technology: applied at specific points/ concentrated on a small area

In a permanently protected area?:

Date of implementation: 10-50 years ago

Type of introduction
The plastic pipe running from the roof to the concrete tank. (S. Stevenson (Camp kuhiston))

Classification of the Technology

Main purpose
  • improve production
  • reduce, prevent, restore land degradation
  • conserve ecosystem
  • protect a watershed/ downstream areas – in combination with other Technologies
  • preserve/ improve biodiversity
  • reduce risk of disasters
  • adapt to climate change/ extremes and its impacts
  • mitigate climate change and its impacts
  • create beneficial economic impact
  • create beneficial social impact
  • access to water
Land use

  • Cropland
    • Annual cropping: vegetables - other
    • Tree and shrub cropping: fruits, other
    Number of growing seasons per year: 1
  • Forest/ woodlandsProducts and services: Fruits and nuts
  • Settlements, infrastructure - Settlements, buildings
    Remarks: Населенный пункт с небольшими огородами
Water supply
  • rainfed
  • mixed rainfed-irrigated
  • full irrigation

Purpose related to land degradation
  • prevent land degradation
  • reduce land degradation
  • restore/ rehabilitate severely degraded land
  • adapt to land degradation
  • not applicable
Degradation addressed
  • soil erosion by water - Wt: loss of topsoil/ surface erosion
  • soil erosion by wind - Et: loss of topsoil
SLM group
  • water harvesting
SLM measures
  • agronomic measures - A7: Others
  • structural measures - S5: Dams, pans, ponds

Technical drawing

Technical specifications
Чертеж показывает металлический желоб (0,15м шириной), располагаемый по периметру верхушки крыши. Желоб собирает дождевую воду с крыши и через пластиковую трубу, сделанную из старых бутылок, соединенных друг с другом путем обвязки, пропускает ее в бетонную цистерну. В данном примере, протяженность цистерны 4м, ширина -2м, глубина – 2м и расположена она в тени дома для того, чтобы снизить уровень испарения. Цистерна расположена с уклоном и частично заглублена вверх по склону. Цистерна закрыта в целях безопасности и предотвращения внешнего загрязнения.

Место расположения: Бошкенгаш. Рудаки

Дата: 20011-05-06

Необходимые технические навыки для землепользователей: средний (Требуется техническое знание, иначе конструкция рухнет)

Основные технические функции: сбор воды / повышение водоснабжения

яма/ цистерна/ пруд
Глубина канав/ям/дамб (м): 2
Ширина канав/ям/дамб (м): 2
Длина канав/ям/дамб (м): 4

Особенность ямы/ цистерны/ пруда: емкость 16м3

Площадь, с которой собирается вода: 20м2

Крутизна склона внутри ямы: 0%;
Крутизна склона снаружи ямы: 0%

Другие особенности: размер цистерны 2*2*4м

Сбор воды: разница между площадью, с которой собирается вода, и площадью, куда она собирается: 1:0.5

Lieu: Boshkengash. Rudaki, Tadjikistan

Date: 20011-05-06

Connaissances techniques requises pour les utilisateurs fonciers: moyen (Certaines connaissances technique sont requises ou alors la structure ne tient pas).

Principales fonctions techniques: récupération de l'eau / augmentation des réserves d'eau

Barrage / bassin / étang
Profondeur des fossés / puits / barrages (m): 2
Largeur des fossés / puits / barrages (m): 2
Longueur des fossés / puits / barrages (m): 4

Spécifications des barrages / bassins / bassins: Capacité 16m3

Zone de collecte: 20 m2m2

Zone bénéfique: 0,2 h.am2

Pente de la paroi du barrage à l'intérieur: 0%;
Pente du mur du barrage à l'extérieur: 0%

Dimensions des spillings: 0m

Autres spécifications: dimension du réservoir 2 * 2 * 4m

Pour la récolte de l'eau: le rapport entre la zone où l'eau récoltée est appliquée et la superficie totale à partir de laquelle l'eau est collectée est: 1: 0,5
Author: Soisin Peter

Establishment and maintenance: activities, inputs and costs

Calculation of inputs and costs
  • Costs are calculated:
  • Currency used for cost calculation: Somoni
  • Exchange rate (to USD): 1 USD = n.a Somoni
  • Average wage cost of hired labour per day: 10.00
Most important factors affecting the costs
Labour, tools and piping can be provided by the land user and stone for the foundation is locally available, however, there is an initial outlay of $300 for the cement, wood and metal guttering. In this example the money for the initial outlay was collected by family members working in Russia and from local salaries.
Establishment activities
  1. construction of concrete tank and guttering (Timing/ frequency: spring)
  2. (Timing/ frequency: None)
Establishment inputs and costs
Specify input Unit Quantity Costs per Unit (Somoni) Total costs per input (Somoni) % of costs borne by land users
Labour
Construction of concrete tank and guttering Persons/day 20.0 22.5 450.0 100.0
Equipment
Tools pieces 6.0 11.1666666 67.0 100.0
Construction material
Concrete sand, stone tons 2.0 337.5 675.0 100.0
Metal guttering tons 0.5 900.0 450.0 100.0
Wood tons 0.5 240.0 120.0 100.0
Plastic pipes pieces 1.0 10.0 10.0 100.0
Total costs for establishment of the Technology 1'772.0
Total costs for establishment of the Technology in USD 1'772.0
Maintenance activities
  1. Cleaning (Timing/ frequency: annually)
Maintenance inputs and costs
Specify input Unit Quantity Costs per Unit (Somoni) Total costs per input (Somoni) % of costs borne by land users
Labour
Cleaning Person/day 1.0 25.0 25.0 100.0
Total costs for maintenance of the Technology 25.0
Total costs for maintenance of the Technology in USD 25.0

Natural environment

Average annual rainfall
  • < 250 mm
  • 251-500 mm
  • 501-750 mm
  • 751-1,000 mm
  • 1,001-1,500 mm
  • 1,501-2,000 mm
  • 2,001-3,000 mm
  • 3,001-4,000 mm
  • > 4,000 mm
Agro-climatic zone
  • humid
  • sub-humid
  • semi-arid
  • arid
Specifications on climate
Estimated to be at the lower end of the range
Thermal climate class: temperate
Slope
  • flat (0-2%)
  • gentle (3-5%)
  • moderate (6-10%)
  • rolling (11-15%)
  • hilly (16-30%)
  • steep (31-60%)
  • very steep (>60%)
Landforms
  • plateau/plains
  • ridges
  • mountain slopes
  • hill slopes
  • footslopes
  • valley floors
Altitude
  • 0-100 m a.s.l.
  • 101-500 m a.s.l.
  • 501-1,000 m a.s.l.
  • 1,001-1,500 m a.s.l.
  • 1,501-2,000 m a.s.l.
  • 2,001-2,500 m a.s.l.
  • 2,501-3,000 m a.s.l.
  • 3,001-4,000 m a.s.l.
  • > 4,000 m a.s.l.
Technology is applied in
  • convex situations
  • concave situations
  • not relevant
Soil depth
  • very shallow (0-20 cm)
  • shallow (21-50 cm)
  • moderately deep (51-80 cm)
  • deep (81-120 cm)
  • very deep (> 120 cm)
Soil texture (topsoil)
  • coarse/ light (sandy)
  • medium (loamy, silty)
  • fine/ heavy (clay)
Soil texture (> 20 cm below surface)
  • coarse/ light (sandy)
  • medium (loamy, silty)
  • fine/ heavy (clay)
Topsoil organic matter content
  • high (>3%)
  • medium (1-3%)
  • low (<1%)
Groundwater table
  • on surface
  • < 5 m
  • 5-50 m
  • > 50 m
Availability of surface water
  • excess
  • good
  • medium
  • poor/ none
Water quality (untreated)
  • good drinking water
  • poor drinking water (treatment required)
  • for agricultural use only (irrigation)
  • unusable
Water quality refers to:
Is salinity a problem?
  • Ja
  • Nee

Occurrence of flooding
  • Ja
  • Nee
Species diversity
  • high
  • medium
  • low
Habitat diversity
  • high
  • medium
  • low

Characteristics of land users applying the Technology

Market orientation
  • subsistence (self-supply)
  • mixed (subsistence/ commercial)
  • commercial/ market
Off-farm income
  • less than 10% of all income
  • 10-50% of all income
  • > 50% of all income
Relative level of wealth
  • very poor
  • poor
  • average
  • rich
  • very rich
Level of mechanization
  • manual work
  • animal traction
  • mechanized/ motorized
Sedentary or nomadic
  • Sedentary
  • Semi-nomadic
  • Nomadic
Individuals or groups
  • individual/ household
  • groups/ community
  • cooperative
  • employee (company, government)
Gender
  • women
  • men
Age
  • children
  • youth
  • middle-aged
  • elderly
Area used per household
  • < 0.5 ha
  • 0.5-1 ha
  • 1-2 ha
  • 2-5 ha
  • 5-15 ha
  • 15-50 ha
  • 50-100 ha
  • 100-500 ha
  • 500-1,000 ha
  • 1,000-10,000 ha
  • > 10,000 ha
Scale
  • small-scale
  • medium-scale
  • large-scale
Land ownership
  • state
  • company
  • communal/ village
  • group
  • individual, not titled
  • individual, titled
Land use rights
  • open access (unorganized)
  • communal (organized)
  • leased
  • individual
Water use rights
  • open access (unorganized)
  • communal (organized)
  • leased
  • individual
Access to services and infrastructure
health

poor
x
good
education

poor
x
good
technical assistance

poor
x
good
employment (e.g. off-farm)

poor
x
good
markets

poor
x
good
energy

poor
x
good
roads and transport

poor
x
good
drinking water and sanitation

poor
x
good
financial services

poor
x
good

Impacts

Socio-economic impacts
Crop production
decreased
x
increased


Due to access to water in the summer months

wood production
decreased
x
increased


From the increased number of fruit trees.

risk of production failure
increased
x
decreased

product diversity
decreased
x
increased

drinking water availability
decreased
x
increased

Quantity before SLM: None
Quantity after SLM: 16 cub m
Readily available especially in the summer months.

water availability for livestock
decreased
x
increased

Quantity before SLM: None
Quantity after SLM: 16 cub m
Dramatically increased, in the summer months.

irrigation water availability
decreased
x
increased

Quantity before SLM: None
Quantity after SLM: 16 cub m
During the drought periods.

expenses on agricultural inputs
increased
x
decreased


In some households water had to be purchased.

workload
increased
x
decreased


No collection of water from distant sources.

Potential debt issues if finance is borrowed for the initial outlay
increased
x
decreased


Initial outlay in the region of $400

Socio-cultural impacts
food security/ self-sufficiency
reduced
x
improved


Able to grow more and of a better quality.

conflict mitigation
worsened
x
improved


Previously residents had to wait at water points.

Hygiene and sanitation
reduced
x
improved


Constant access to water dramatically improves sanitation levels in the village.

Livelihood and human well-being
reduced
x
improved


Permanent access to water has dramatically improved the sanitation and hygiene levels, and increased crop quality and diversification. It has also improved the quality of and access to drinking water, and therefore has significant health benefits.

Ecological impacts
water quantity
decreased
x
increased

Quantity before SLM: None
Quantity after SLM: 16 cub m
Readily available water supply.

water quality
decreased
x
increased

Quantity before SLM: None
Quantity after SLM: 16 cub m

harvesting/ collection of water (runoff, dew, snow, etc)
reduced
x
improved

Quantity before SLM: None
Quantity after SLM: 16 cub m
The technology concentrates on harvesting water.

evaporation
increased
x
decreased


Tank is built in the shadow of the house.

soil moisture
decreased
x
increased

plant diversity
decreased
x
increased


Able to grow crops at different times of the year.

Off-site impacts
water availability (groundwater, springs)
decreased
x
increased

Cost-benefit analysis

Benefits compared with establishment costs
Short-term returns
very negative
x
very positive

Long-term returns
very negative
x
very positive

Benefits compared with maintenance costs
Short-term returns
very negative
x
very positive

Long-term returns
very negative
x
very positive

If it is constructed to a reasonable standard then it will not need any significant maintenance.

Climate change

Gradual climate change
annual temperature increase

not well at all
x
very well
Climate-related extremes (disasters)
local rainstorm

not well at all
x
very well
drought

not well at all
x
very well
Other climate-related consequences
reduced growing period

not well at all
x
very well

Adoption and adaptation

Percentage of land users in the area who have adopted the Technology
  • single cases/ experimental
  • 1-10%
  • 11-50%
  • > 50%
Of all those who have adopted the Technology, how many have done so without receiving material incentives?
  • 0-10%
  • 11-50%
  • 51-90%
  • 91-100%
Number of households and/ or area covered
900 household (70 percent of the area covered)
Has the Technology been modified recently to adapt to changing conditions?
  • Ja
  • Nee
To which changing conditions?
  • climatic change/ extremes
  • changing markets
  • labour availability (e.g. due to migration)

Conclusions and lessons learnt

Strengths: land user's view
  • Improved the standard of living, and the increased access to water allowed the households to have more automony over what that grow and eat.
Strengths: compiler’s or other key resource person’s view
  • Improves the provision of irrigated water for the hot dry summer periods.

    How can they be sustained / enhanced? Further dissemination to other households.
  • Allowed for the improvement and expansion of kitchen gardens.

    How can they be sustained / enhanced? Training on keeping a kitchen garden.
  • Improved the quality and quantity of fruit yields
  • Improved the access of water for sanitation and drinking water purposes

    How can they be sustained / enhanced? Education on sanitation methods.
Weaknesses/ disadvantages/ risks: land user's viewhow to overcome
Weaknesses/ disadvantages/ risks: compiler’s or other key resource person’s viewhow to overcome
  • The perception was that the water was not clean in the concrete pool. However, it was tested and proved to be safe to use. This provided reassurance to the household members. It would be a major benefit if the water tank remains covered and is cleaned periodically.
  • The initial outlay may be considered expensive for some families. Many families have adopted this, possibly if many were built at once the material costs would be reduced. The technology could be tied in with micro finance activities.

References

Compiler
  • Sa'dy Odinashoev
Editors
Reviewer
  • Deborah Niggli
  • David Streiff
  • Alexandra Gavilano
  • Joana Eichenberger
Date of documentation: April 27, 2011
Last update: Nov. 2, 2021
Resource persons
Full description in the WOCAT database
Linked SLM data
Documentation was faciliated by
Institution Project
This work is licensed under Creative Commons Attribution-NonCommercial-ShareaAlike 4.0 International