Figure 2. Monitoring equipment installed at construction sites.
A. Tipping-bucket raingage to measure rainfall depth and intensity;
B. Datalogger to record data from the sensors, trigger the collection of samples, and alert USGS personnel about rainfall and runoff;
C. Modem to retrieve data and to monitor sites during rainfall and runoff;
D. Automatic water-quality sampler to collect samples during storms;
E. Pressure transducer and flume to measure water level and estimate runoff volume; and
F. Plywood wingwalls to funnel runoff from the site to a single discharge point.