HomeInternational Rice Research Notesvol. 24 no. 2 (1999)

Chemical Clearing of Irrigation Channels – A Comparative Evaluation

K. Joseph

Discipline: Agriculture, Management



Irrigation channels below the subdistributory level up to the command area are usually earthen (unlined) and dry during the nonirrigation months, i.e., from June to November. The conducive environment in the channels favors the growth of many weeds. To improve water flow, farmers clear the channels by scraping the soil with a spade before the start of irrigation. This practice is labor-intensive, increases the channel cross-section through soil loss, and accelerates sedimentation downstream. The best option is to use concrete or polythene lining, but it is costly.