The goddess and the computer (1988)

For centuries, rice farmers on the island of Bali have taken great care not to offend Dewi Danu, the water goddess who dwells in the crater lake near the peak of Batur volcano. Through an analysis of ritual, resource management practices (planting schedules, irrigation vs. conservation, etc) and social organization, anthropologist Steve Lansing and ecologist James Kremer discover the intricacy and sustainability of this ancient water management agricultural system.