Development through rainwater harvesting
Sustainable social and economic development for
resettlements in North and East through rainwater harvesting:
Dr Tanuja ARIYANANDA
Sri Lanka’s three decades of conflict leaves the Northern and Eastern
Provinces most affected, with infrastructure and institutions
non-functional, homesteads in disrepair, livelihoods destroyed and most
people unsettled and many traumatized. Now since the war is over and
people and the land is free from the clutches of the terrorist, the
battle is now on to rebuild infrastructure and houses, resuscitate the
institutions, resettle and rehabilitate the affected and displaced
people and help them redevelop their livelihoods.
Roof water harvesting system |
It is only through social and economic development in these areas and
people we can hope to bring ethnic harmony, trust and mutual respect
among all communities to build a united Sri Lanka.
Any development activity cannot be done without water, which is not
only a basic need of living beings, but also important for food
production, sustenance of biodiversity, ecology and overall health of
the environment.
The pressure in the available of water resource is ever increasing
due to the rising population, pollution and climate change variability.
Therefore, provision of water will be the greatest challenge for
development activities in the North and East.
Water resources are limited in the North, Eastern, North Central and
North Western Provinces. Ground water is the only source of water in
many of these areas and has also been over exploited. In many areas in
the North, North Central and Eastern province and the water contains a
high degree of fluoride in ground. Excessive use of agro chemicals and
lack of sanitary facilities led to further pollution of ground water and
high levels of nitrate and faecal Coliform are the evidence of poor
quality ground water.
In recent years, high incidence of chronic kidney disease has been
reported from the North Central and Eastern provinces. In Anuradhapura
alone over 200 deaths are reported annually. Although the root cause is
yet unknown, there is evidence that it is water related. Medical finding
on chronic kidney disease is made clear that irrespective of the root
causes, patients continue to consume water containing fluoride which is
highly harmful. With five to 10 percent of the population being affected
in certain areas and mortality rates escalating, preventive measures
need to be taken.
Rain water collecting from temporary catchment. |
Due to the current situation in the North, IDP returnees will
resettle in the Eastern, North , North Central and Western Provinces in
large numbers.
This will create more pressure on water resources and aggravate water
scarcity as well as health problems. Water scarcity in any location
leads to high incidence of water related diseases and sanitary problems.
Lack of water in an agri-based rural economy, will adversely affect
the socio-economic well-being of the community. Small scale home
gardening is one of the prominent economic activities in the North and
East. Lack of water supply results in poor maintenance or total
negligence of home gardens and it will have a series of net impacts on
the economy. Low productivity of land, food insecurity in rural and
urban sector, nutritional deficiencies especially among children and
women, lack of income, high dependency on external assistance, and poor
living standards are a few out comes of water scarce condition.
Potentiality of rainwater harvesting
In a crisis situation like this, the best option is to use the
preserved rainwater for domestic and non domestic use.
Traditional ‘Pathaha’, a garden pond. |
Proper promotion of rainwater harvesting technology motivate the
users to supplement their water sources and thereby reduce the over
exploitation of other water resources.
Rainwater harvesting is accepted as a feasible water supply option in
many countries and even in Sri Lanka, potentiality in rainwater
harvesting is well documented in the National Rainwater Harvesting
Policy.
Domestic rainwater (roof water) harvesting technology introduced in
other areas with similar climatic condition offer reasonably good
services to beneficiaries. Average annual rainfall experienced in the
target areas range from 750 mm in Mannar to 900 mm in Anuradhapura
district. The rainfall pattern in Sri Lanka is bi-modal and depends on
the two monsoon seasons. The driest months of the year range from June-
September in Anuradhapura district and May to September in Mannar
district ( four to five months).
An average roof area of 50 m2 in Mannar district will provide the
households with at least 40 litres of water per day with an 8,000 litre
tank during the driest period from July to September. This will serve
households with five people the minimum water requirement of the person
which is eight litre per day for drinking and cooking. A tank of 8,000
litres will serve households with 40 litres per day for six to seven
months.
Run off rainwater from the ground can also be collected and preserved
in the home garden for agriculture purposes and to recharge the
groundwater table. For example a two-acre land in an area, which
receives annual rainfall of 1000mm, has the potential to store minimum
12,900 m3 of water annually through surface run off. A traditional ‘paththa’,
a garden pond of 100 m3 volume can be filled very easily in an hour’s
intense rain, and the water collected can be used for agriculture
purposes effectively by using water conservation irrigation methods such
as drip irrigation and pot irrigation, while the excess can be guided to
recharge the groundwater table. A project implemented by the Lanka
Rainwater Harvesting Forum in Kotavehera D.S of Kurunegala District has
shown increased availability of water for drinking and crop production
through introduction of rainwater harvesting technologies. It has also
brought many other social and economic benefits to households. It has
reduce the daily average household time (mostly women’s) spend to
fetching water from one hour and 20 minutes to average 12 minutes.
Average annual income from home gardening has increased from Rs. 4,000
to Rs. 13,000.
Rainwater harvesting during disasters
The tsunami reported to have contaminated 40,000 wells around the
coastline where over 60 percent of the people had relied on groundwater
supply. Rainwater harvesting systems built by the Lanka Rainwater
Harvesting Forum in the tsunami affected areas in South and East
provides 4,000 households with drinking water to their door step. Easy
access to water supply system has brought many other benefits to these
households such as reducing the time spent on collecting water, more
reliable supply, fluoride free, better sanitation practices, more water
security and availability of water for home gardening. Cyclone Nargis of
May of 2008 which affected 37 townships in Myanmar left 130,000 people
missing and 2.4 million were severely affected. To prevent further
disaster through lack of safe drinking water the authorities introduced
improvised rainwater harvesting system using temporarily shelters,
bamboo gutters and easily transportable storing vessels.
Continuous Contour Trenching and other water harvesting technologies
applied in a remote village of Hiwar Bazaar in the Maharashra state in
India which receives only 80 mm annual rainfall has transformed barren
lands to fertile land and has reduced 100 percent poverty in the village
to zero in just five years.
Similarly, in Gunzu province in North China which receives on 380 mm
of annual rainfall through a Government introduced project called 1-2-1
project, which means each family in the area without availability of
surface and groundwater would get subsidy to build one hardened
catchment yield ( roof or paved area), two under ground tanks and one
piece of land for courtyard economy.
The introduction of rain water harvesting has made possible the
farmers to grow one harvest of rice and one harvest of irrigated corn
instead of one harvest of rain fed corn before the project.
The yield has increased by three folds and the income by four folds.
Simple rain water harvesting technologies introduced in IDP welfare
centres will reduce expenses borne by the Government and other
organizations on bowsering water from far, especially during the
approaching rainy season.
This will also reduce flooding to some extent. By introducing
awareness on rainwater harvesting technologies and water conservation
practices as well as good hygiene measures to the communities from an
early stage will ensure continuous practice of these technologies when
they return to their homes. Introduction of rainwater harvesting
technologies to resettled areas will reduce the pressure on available
resources.
Practice of rainwater harvesting will bring a sense of responsibility
to conserve water in one’s own land, village and region as well as bring
about a new dimension of solidarity and tolerance between people and
communities in watersheds, between boundaries.
The writer is Director, Lanka Rain Water Harvesting
Forum, President, International Rainwater Catchments System Association
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