A portable knockdown above ground watering system and method for establishing a new lawn is provided. The system includes a compact water manifold structure comprising a manifold housing having a water inlet in fluid communication with a plurality of water outlets, the manifold structure enclosed in a portable case. A plurality of solenoid actuated valves are connected adjacent to and in fluid communication with each of the water outlets. A plurality of sprinkler heads may be connected in fluid communication to the manifold structure with removably connected outlet hoses.