For the Yaquis, a tribe in Mexico, nearly 20 years of drought and little help from the government has forced them to irrigate their lands with the only water source available - raw sewage. Over the past decade more than 4,000 hectares of once fertile land dried up - and things could go from bad to worse. The state government is building an aqueduct that will divert nearly 75 million cubic metres of water from the Yaqui river to a nearby town. The government says the project is crucial, but Yaqui leaders question the decision to prioritise alleviating drought in cities over farming communities. Al Jazeera's Rachel Levin reports from Sonora.