An irrigation system in Pakistan, Catherine Arnold writes, covers 36,000 miles plus 994,000 miles of farm and field ditches. Yet many farmers don’t receive their share of water. Writing for the University of Utah Water Center (@uWaterCenter), Catherine tells of a university researcher who collaborated with colleagues in Pakistan to find out why. See more from Catherine (@TreesWhales) at her website, which includes an excellent page on science writer resources. image: Hamza Sarwar