Large field sensing has been widely studied whereby an application for representative agricultural and disaster reduction utilizes a wireless sensor network (WSN). However, outdoor field sensing involves problems related to communication quality and distance. Particularly, the communication reliability in portable wireless sensor networks is greatly influenced by the surrounding environmental factors which affects the communication nodes’ movement. Unlike fixed wireless sensor networks, radio wave conditions are dynamic, which yields many differences such as the effects of plants. Both the performance and communication quality are addressed by proposing a rapid re-routing mesh network capable of high speed re-connecting at the time of the failure. In this paper, the task of building an ad hoc simple water gauge system that assumes movement was carried out with implementation of wireless sensor networks. Furthermore, we evaluated the problems by deploying outdoor sensor nodes based on our proposed system.