In order to guarantee the flood protection with a clear goal, depends upon the modern computer communication and 传感 the technology, implements melts the long-distance real-time monitor to river course water level nobody, and can the automatic transmission above all levels of department responsible for the work, achieve the science early warning, reduces the flood prevention cost, enhances the efficiency the goal.

Second, principle of design

1. establishments fast stable data-transmission channel, guarantee water level data message timeliness and accuracy.

2. establishments building block systems hierarchy system structure, the guarantee system can highly reliably the implementation and the movement.

3. systems are the open style designs, if the system later period needs to additionally build monitors the mesh point, the system may steadily replace but does not have to duplicate the investment massive funds.

4. in the safeguard water level survey function foundation, the optimized system, reduces the system expense.

5. uses the solar cell to measure and report the installment as the water level the power source, thus enables the entire automatic survey line bridge early warning water level possibly to become.

6. waters level surveys has the many kinds of ways, the contact type and the non- contact type. According to ours project experience and the actual situation, decided selects the investment type water level metering equipment.

7. waters level information transmission, because the scene installs the condition the limit, we recommend the use blower, GSM, GPRS take the data channel.

Third, design proposal

System diagram

May see by the system structure drawing, the system is a model pyramid structure, the water level data message transmission channel divides into the obvious four levels.

B) system data message flow graph

System function:

1st, long-distance hypothesis function

Establishes may the long-distance hypothesis subordinate govern the test point in the inspection station computer the warning water level value.

2nd, the automatic transmission reports to the police the function

When surpasses the early warning water level will measure and report the installment automatically to report the water level information to on the inspection station computer, on the computer screen will have the demonstration and the buzzer resounds. Meanwhile reports the water level information.

3rd, data archiving function

The system all data message can automatically preserve in the computer large-scale database, is advantageous for the data retrieval and the data analysis