sentences:  A system of irrigation ditches known locally as "Kelliyo" fed directly from the Shebelle and Jubba rivers into the plantations where sorghum, maize, beans, grain and cotton were grown during the "gu" (Spring in Somali) and "xagaa" (Summer in Somali) seasons of the Somali calendar.This irrigation system was supported by numerous dikes and dams.To determine the average size of a farm, a land measurement system was also invented with "moos", "taraab" and "guldeed" being the terms used.