1. Introduction
The Thalangama tank was built during the reign of King Parakramabahu VI (1551-1557) and to date is the primary source of water in the area. The tank use as a irrigation tank and also for the recreational purpose by the villages. Two medium sized canals starting from the tank, feed nearly two hundred and fifty acres of paddy cultivated between Akuregoda and Thalangama North. Between these two canals, fertile paddy land stretches as far as the eye can see, as far as the Palan Thuna Junction in Battaramulla.
Thalangama tank nourish from the Madiwela catchment area and surrounding wetland. The catchment consist wet land and the residential areas. The reservoir still provides water for paddy cultivation for a limited extent. It …show more content…
ft. to about 32 Ac. ft. of the capacity. The capacity of the tank was reduced by 0.45 m due to construction of new spillway under the Madiwela east diversion scheme that reduces the original capacity of the tank. The situation further raised by the siltation of the tank that has led to spread of the invasive alien plant species Annona glabra (Wel Atha). Approximately 8 acres of the tank bed is covered by the invasive plant species. The situation causes the water deficit to the farmers of commanding area of Thalangama tank especially during dry season and flooding of the Colombo …show more content…
The incoming water flow is stopped by the natural barrier exist within the tank.
The quality of irrigation water is important parameter to determine the sustenance of the agriculture. The poor quality water affect to crop performance and the yield of the paddy. The dredging process may affect to the quality of the water. The dredging of the sediment has a risk to release unwanted elements to the water. The period of time need to settle the tank after the dredging. The study will carry to find the require time to settle down the water quality. It will help to predict the time needed to start water release to the farmers. Figure 1: Water Movement of the Thalangama Tank
The water movement of the Thalangama tank represent by this picture. According to that the catchment yield will store by the Thalangama tank and excess water spill to the Averihena Tank. The Parliament Lake bears the reject water from the Averihena tank. The capacity of Parliament Lake not sufficient to hold all water removes from the Averihena tank causing the flooding of the Colombo area. The risk of flooding can minimize by the increment of the Thalangama tank
The Thalangama tank was built during the reign of King Parakramabahu VI (1551-1557) and to date is the primary source of water in the area. The tank use as a irrigation tank and also for the recreational purpose by the villages. Two medium sized canals starting from the tank, feed nearly two hundred and fifty acres of paddy cultivated between Akuregoda and Thalangama North. Between these two canals, fertile paddy land stretches as far as the eye can see, as far as the Palan Thuna Junction in Battaramulla.
Thalangama tank nourish from the Madiwela catchment area and surrounding wetland. The catchment consist wet land and the residential areas. The reservoir still provides water for paddy cultivation for a limited extent. It …show more content…
ft. to about 32 Ac. ft. of the capacity. The capacity of the tank was reduced by 0.45 m due to construction of new spillway under the Madiwela east diversion scheme that reduces the original capacity of the tank. The situation further raised by the siltation of the tank that has led to spread of the invasive alien plant species Annona glabra (Wel Atha). Approximately 8 acres of the tank bed is covered by the invasive plant species. The situation causes the water deficit to the farmers of commanding area of Thalangama tank especially during dry season and flooding of the Colombo …show more content…
The incoming water flow is stopped by the natural barrier exist within the tank.
The quality of irrigation water is important parameter to determine the sustenance of the agriculture. The poor quality water affect to crop performance and the yield of the paddy. The dredging process may affect to the quality of the water. The dredging of the sediment has a risk to release unwanted elements to the water. The period of time need to settle the tank after the dredging. The study will carry to find the require time to settle down the water quality. It will help to predict the time needed to start water release to the farmers. Figure 1: Water Movement of the Thalangama Tank
The water movement of the Thalangama tank represent by this picture. According to that the catchment yield will store by the Thalangama tank and excess water spill to the Averihena Tank. The Parliament Lake bears the reject water from the Averihena tank. The capacity of Parliament Lake not sufficient to hold all water removes from the Averihena tank causing the flooding of the Colombo area. The risk of flooding can minimize by the increment of the Thalangama tank