Figure 2. Monitoring equipment installed at construction sites.

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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.