In Figure 3, we show the structure of each monitoring
sensor unit at a remote site. In monitoring sensor module,
we employ 1) an ultrasonic Doppler instrument with a 128K
data logger, called STARFLOW, manufactured by UNIDATA
(UNIDATA 2007), Australia, to monitor water level and
velocity (See Figure 4) and 2) a precipitation sensor by
Fischer (MetoClima 2007) to measure the amount and inten-sity of rain (See Figure 5). STARFLOW is deployed under