This is the fifth lecture of the course 'Irrigation based Agro-ecosystems' conducted at the Faculty of Social Sciences and Humanities of the Rajarata University of Sri Lanka
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Wrmg 5 mahaweli agro-ecosystems
1. WRMG 2212
Theory 40 hrs
Rajarata University of Sri Lanka
P.B. Dharmasena
0777-613234, 0717-613234
dharmasenapb@ymail.com, dharmasenapb@gmail.com
https://independent.academia.edu/PunchiBandageDharmasena
https://www.researchgate.net/profile/Punchi_Bandage_Dharmasena/contributions
http://www.slideshare.net/DharmasenaPb
4. Typical Landscape before the intervention of Mahaweli Program in 1975
Natural
Streams
Tanks built across
Natural Streams
Forests
Forests
Forests
Paddy
Field
Yoda Ela (Main
Canal) along a
Contour
6. Natural
Streams
Tanks built across
Natural Streams
Forests
Forests
Forests
Paddy
Field
Existing Yoda
Ela (Main Canal)
along a Contour
Step 1 – All the Forest Patches in Areas which are irrigable from the Main Canal were cleared
7.
8. Step 2: Meandering Main Canal (Yoda Ela) was straightened and existing village tanks
within the irrigable area below the Canal was removed
9. 3-D view of a Typical Landscape of the selected area after the
removal of existing village tanks and forest patches
RIDGE
Valley
12. Step 4 : Field Canals were constructed to deliver water to the farmlands which were
leveled into basins (Liyaddas) mainly for paddy cultivation. Beds of all the village
tanks were converted paddy fields
Settlement
Areas allocated
for farmers
13. Step 5 : Irrigable Land was then fragmented into 1 Ha allotments to distribute among new
settlers. Balance area above the command of the canals was allocated for settlement
Farmer
Settlement
Zones
1 Ha
Paddy
Farms
14. Aerial View of area as seen today
Area Selected for
the demonstration
Right Bank Main
Canal from
Kalawewa (Yoda
Ela)
Kala Oya
Stream