What are the four water sources, referred to as "taps," that sedlak believes will solve our urban water crisis?

Answer:

Local water source, recycled water from sewage treatment plants, water conservation from outdoor water use and generating water from desalinated seawater are the four water sources referred to as "taps," that Sedlak believes will solve our urban water crisis.

Explanation:

David Sedlak is an civil and environmental engineer in USA, who has shared four practical solutions to existing water crisis. His objective is to create a model system where water crises can be minimised by shifting the interest from the current source water supply. He suggested four ways or taps from where water can be obtained in order to prevent occurrence of catastrophic drought due to usage of water from a single source.  

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answer: national resource conservation services

national resource conservation services is the us. based approach that provides technical and financial assistance for natural resource management. nrcs society in conservation of resources by involving in activities like farmland protection, flood prevention, watershed protection, urban conservation, conserves economic and environmental conditions. it conducts soil surveys and implements the policy of natural resources management on the society.