Ground Water <ul><li>In the Kalpitiya Peninsula,the Gyben Herzberg, fresh water lens is extensively pumped for irrigation ...
  Impact of Erroneous   Land Use <ul><li>Leaching of agrochemicals from intensively cultivated soils is responsible for th...
Impacts <ul><li>Some of the grave effects of high nitrite intake on human health are the incidence of  methaemoglobinaemia...
Status of drinking water wells in Kalpitiya <ul><li>The National Water Supply and Drainage Board had received a massive lo...
 
Model Well in Nawakkaduwa <ul><li>The NWSDB then contracted with NSRC to establish a model to bioremediate the water in th...
Planting around well The area around the drinking water well was planted with non leguminous trees; mostly indigenous spec...
Annual cropping using Organic cultivation techniques * Pathola *Karawila *Wetakolu *Thampala *Bada Iringu *Nivithi *Bandak...
Results from the tests carried out so far revealed that that the Nitrate levels at the start (77 mg/1L) had dropped to 7 m...
Upcoming SlideShare
Loading in...5
×

Restoration Of Ground Water In Kalpitiya, Sri Lanka

3,140

Published on

Leaching of agrochemicals from intensively cultivated soils is responsible for the elevated concentrations of nitrate, nitrite, chloride and potassium in many of the irrigation wells in Kalpitiya, Srilanka.
Ground water nitrate has already exceeded the WHO drinking water guidelines of 10mgN/1 in many wells, while nitrite concentrations in some wells exceed the tolerance levels of .001 mg/L water. The area around the drinking water well was planted with non leguminous trees; mostly indigenous species of trees were used. A dense planting pattern was followed in order that a root mat be formed quickly. The trees would begin the uptake of nitrates and nitrites and thereby reduce their concentrations in the ground water and soil..........

Published in: Technology, Business
0 Comments
1 Like
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total Views
3,140
On Slideshare
0
From Embeds
0
Number of Embeds
1
Actions
Shares
0
Downloads
5
Comments
0
Likes
1
Embeds 0
No embeds

No notes for slide

Restoration Of Ground Water In Kalpitiya, Sri Lanka

  1. 1. Ground Water <ul><li>In the Kalpitiya Peninsula,the Gyben Herzberg, fresh water lens is extensively pumped for irrigation and potable water supplies. The recharge is from direct infiltration from rainfall and return irrigation flows. </li></ul><ul><li>There is a clear correlation between ground water quality and land use. </li></ul><ul><li>Annual, cash crops are grown as monocultures, there is no inter- cropping and massive doses of agrochemicals are used in cultivation. </li></ul>
  2. 2. Impact of Erroneous Land Use <ul><li>Leaching of agrochemicals from intensively cultivated soils is responsible for the elevated concentrations of nitrate, nitrite, chloride and potassium in many of the irrigation wells. </li></ul><ul><li>Ground water nitrate has already exceeded the WHO drinking water guidelines of 10mgN/1 in many wells, while nitrite concentrations in some wells exceed the tolerance levels of .001 mg/L water. </li></ul><ul><li>There is a clear correlation between ground water quality and land use. The nitrate and chloride concentrations in cultivated areas were in the ranges of 10-15 mg N/l and 100-300 mg/l respectively. Whereas in those uncultivated areas, the ranges seen were 0-2 mg/l and 50 –100 mg/l respectively. </li></ul>
  3. 3. Impacts <ul><li>Some of the grave effects of high nitrite intake on human health are the incidence of methaemoglobinaemia (Blue Baby Syndrome) and gastro intestinal cancers. </li></ul><ul><li>A study done by the University of Ruhuna in 1995 has revealed that over 64% of the infants in Kalpitiya suffered from malnutrition and potential methaemoglobinaemia! </li></ul><ul><li>A survey conducted by NSRC in 2003 in Nawakkaduwa revealed that in 109 families, 20 cases of Blue Baby Syndrome had resulted in still born babies. </li></ul>
  4. 4. Status of drinking water wells in Kalpitiya <ul><li>The National Water Supply and Drainage Board had received a massive loan from the Asian Development Bank that established 12 drinking water wells in the Kalpitiya peninsula. After testing the water in those wells they abandoned 7 wells and only five actually serve the drinking water needs of the people. </li></ul><ul><li>Water testing of the 16 wells selected in the Project in Nawakkaduwa revealed that not one had water that was potable. </li></ul>
  5. 6. Model Well in Nawakkaduwa <ul><li>The NWSDB then contracted with NSRC to establish a model to bioremediate the water in the well at Nawakkaduwa. </li></ul><ul><li>In 2003 the water in the well was tested. The test revealed that in addition to high levels of nitrate and nitrite, pesticide residues were detected. </li></ul>
  6. 7. Planting around well The area around the drinking water well was planted with non leguminous trees; mostly indigenous species of trees were used. A dense planting pattern was followed in order that a root mat be formed quickly. The trees would begin the uptake of nitrates and nitrites and thereby reduce their concentrations in the ground water and soil 2002 2003 2004 Ecological Restoration
  7. 8. Annual cropping using Organic cultivation techniques * Pathola *Karawila *Wetakolu *Thampala *Bada Iringu *Nivithi *Bandakka *Cucumber *Pumpkin *Ma *Tomato *Dambala *Chillies
  8. 9. Results from the tests carried out so far revealed that that the Nitrate levels at the start (77 mg/1L) had dropped to 7 mg/1L!

×