An auto irrigation system for home gardens in Sri Lanka

A subsurface pot irrigation system and a subsurface irrigation system with specially designed clay emitters were designed and tested to investigate the efficiency of the auto-irrigation systems for home gardens crop cultivation. The yield and development of curry chilies cultivated under the designed subsurface irrigation systems were compared with the yield and development of curry chilies under manual irrigation during three seasons; January – April, May - August and September – December. The yield obtained from the crop grown under designed irrigation systems is two times higher than the yield of crop grown under manual irrigation during dry seasons. The use of water under subsurface irrigation system with clay emitters was considerably less when compared with the subsurface pot irrigation. Both designed irrigation systems automatically control the water intake of soil when the soil is wet

Groundwater quality changes in the tsunami affected coastal belt - Southern Sri Lanka

The groundwater quality of an aquifer system in Mirissa area was studied. 19 dug wells distributed over a 6 km coastal strip were selected. The dug wells were sited in a line perpendicular to the coastline. Most of the dug wells were shallow and their diameter ranged from 0 to 1m. In low lying coastal areas, electrical conductivity was 3500 μs/cm. Heavy rains in early January improved the quality in coastal groundwater and hydro geological discharge was also significantly affected. First and second lines receiving their recharge from inland. Therefore, pH values changed and the quality of water significantly improved giving an electrical conductivity below 1000 μs/cm

Natural water purification system for local community

A simple household level natural water purification system to purify water to meat small family requirement. It disused with six important components including Storage, Sedimentation, Biological treatment, and Filtering, Disinfection and Drinking water storage. During the treatment process Electrical conductivity and Total Dissolved Solids values is not changed but pH is slightly increased in the bio treatment compartment due to excretion of ammonia form by the fish. A Significant change of Coli form bacterial count between UV treatment together with sand and Charcoal filter with comparing drinking water tank It is 90.95% reduction comparing with raw water E coli count is completely removed from this treatment process