Research on Error Experiment of Tipping Bucket Rain Gauge and Error Amendment Measure;

Ultrasonic rain gauge rised up the measuring range and accuracy by adopted the ultrasonic technique to measure precipitation .

By comparison with self-recording rain gauge in observation, data reorganization, and errors, JDZ—1 data-logger rain gauge is proved to be a more convenient, rapid, and precise in data measurement and compilation.

The monitoring and warnning network in rain adopted new type of grid capacite rainfall gauge as the auto-observing instrument .

By comparing the design rainfall for the urban area and suburbs in the same period,and taking meteorological and g.

With comprehensive investigation and analysis, it is considered that design rainfall for farmland drainage should be selected according to the present situation of drainage projects and the differences in rainfall spatial distribution.