Sierra Nevada used to be my backyard. A singularity in "The Alpujarras"  I think is worth mentioning.

https://youtu.be/faAJBBpNBiQ.     

This book is kind if a gem and explains It in depth: "Manual del Acequiero". 

https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.juntadeandalucia.es/medioambiente/portal_web/agencia_andaluza_del_agua/participacion/publicaciones/manual_del_acequiero.pdf&ved=2ahUKEwjauKmX3Mb7AhUP3aQKHUbaCc8QFnoECBEQAQ&usg=AOvVaw0ppgQ_x5PByD8vLkr9orhE