"The decline of Harappan urbanism probably had many contributing factors. The shift to a concentration on kharif cultivation in the outer regions of the state may have seriously disrupted established schedules for craft production, civic flood defense, building and drain maintenance, and other publicly organized works on which the smooth running of the state depended. The reduction in the waters of the Saraswati and the response of its farmers by migrating into regions to the east tore apart the previous unity of the Harappan state, disrupting its cohesion and its ability to control the internal distribution network."