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I I I I I I I I I I I I I I I I I I I 000022 Event driven is where changes in the data from the sensors, such as the tip of the tipping bucket or a change in stream height greater than a user programed increment, as measured during the sampling of the water level transducer cause the remote CR10 to send a transmission independent of the central site polling. The user has the capability of programing the CR10 to initiate an event transmission on virtually any conditional change of raw sensor inputs or processed sensor variables. For example, an alarm transmission may be programmed to occur if the rate of rise of stream, based on water level sensor data converted to feet, exceeds a user defined rate, input in units of feet per hour. The CR10 network of polled and event telemetry is based on 1200 bits per second, single frequency, half duplex radio communication, with robust error checking and link control. Since communication is two way, it is possible to reprogram remote sites, query remote sites for current status, and send commands to change the CR10 control outputs, all from the central site. The two way CR10 protocol has an additional advantage that any remote site CR10 can act as a repeater for messages to other sites. Central sites We have configured the two central sites with IBM PC/AT computers. The software needed to operate the basic ALERT system will operate without noticeable performance degradation on the IBM PC/XT, however the addition of real time modelling (which we understand is to be provided by the U. S. corp of Engineers) may necessitate additional processing power. The cost difference is relatively minor and the resulting system will be more flexible for future enhancements. System Software The central site system is based on the Campbell Scientific PC205 system with an ALERT interface. Campbell Scientific has more than 200 sites of the PC205 system installed. The system operates under the traditional MS-DOS operating system. In addition to providing a more robust software envirortment - the software is designed to be easily installed on "ADOS" (multitasking) operating systems pending release from IBM and Microsoft. System configuration We propose to work closely with your radio shop, Emergency Preparedness, NWS and other staff to optimize the configuration of the network. In some instances it appears to be advantageous to add rain sensors at the stream gauge sites to increase reporting density, which may add very little cost. We hope to work closely with the Regional Building staff in selecting appropriate gauge sites. Minor changes in gauge location may result in significant savings in long term gauge maintenance. SCC - Pikes Peak Early Flood Warning Proposal 10