The  Idamalayar  Irrigation  Project  is  mainly aimed for irrigating  vast cultivable  land  lying in  Periyar  Basin  on the  right  side  of Periyar River in Aluva and Paravur Taluks of  Ernakulam  District  and  Mukundapuram Taluk  of  Thrissur  District.  It  also envisages extension  of  irrigation  on  left  and  right bank of Chalakudy River. Now water distribution through Chalakudy left bank and right bank canals under CRDS are being done through Thumburmuzhy weir across Chalakudy river. After completing Idamalayar Irrigation Project, water  from Bhoothathankettu barrage will be benefitted to Main canal, Low Level Canal and Chalakudy left Bank canal (under CRDS) through  connecting Link Canal and hence water from Thumburmuzhi weir will be benefitting exclusively for Chalakudy Right Bank Canal. The total additional ayacut for irrigation aimed at, by the implementation of the Project using the water of  Periyar and  Chalakudy Rivers is 14394 hectares. Out of this, ayacut of 4083 ha. is achieved. The main source of water is Idamalayar Dam of Kerala State Electricity Board which is already completed and the run off from the free catchment upstream of  Bhoothathankettu.  The Project started in 1981 with approved cost of Rs. 17 crores. The project was approved by State Government for Rs. 107 crores as per 1992 Schedule of Rates.

The Main canal of length 32.278 km (100%) completed. 14.789 km  of Low level canal is 

completed out of 14.863 km.  2.793 km of Link canal is completed out of 7.575 km.