National Flood WorkshopHouston, TexasOctober 2010

Don Van Wie, Telos ServicesR. Chris Roark, Blue Water Design, LLC

ALERT2 Concentration Protocol is in production in Overland Park/KCMO for repeater-to-base path

ALERT2 is operating in parallel with ALERT on repeater-to-base leg in Urban Drainage and Flood Control District

UDFCD: ALERT v ALERT2 side-by-side comparisons 8 months, 2 million ALERT messages analyzed

Overland Park: Logging at repeater sites permits exact determination of ALERT2 losses Early June storms with partial logging Full month analysis for September 2010

Demonstrate reliability of hardware in normal operating environment

Quantify the relative performance of ALERT/ALERT2

Verify or and adjust the operating parameters based on operations at a production scale

No hardware failures ALERT2 data loss “over the air” is typically

less than 5 reports per 10,000 over any path that is suitable for ALERT

Relative ALERT2 performance improves as traffic rates increase

RF-only Preamble has been extended 55 msec

Slot variance study shows 0.5 second slots are possible

10 BWD Modulator/Encoders 6.5 years of unit time accumulated

4 BWD Demodulator/Decoders 4.75 years of combined operation

About half of equipment is in unconditioned environment

NO Failures!

Data Composition and Summary Statistics

Repeater Start Date ALERT Records ALERT2 Records Difference (A2-A) % Difference

Blue Mountain 8/1/2010 328,319 334,064 5,745 1.75%

Smoky Hill 2/23/2010 771,716 781,508 9,792 1.27%

West Creek 2/23/2010 478,256 489,544 11,288 2.36%

Lee Hill 4/9/2010 178,764 183,148 4,384 2.45%

Gold Hill 5/10/2010 250,250 261,083 10,833 4.33%

Total             

2,007,305             

2,049,347                    42,042  2.09%

ALERT ALERT2

Repeater Sample Missed by Alert % Missed by %

Alert Errors Lost Alert2 Lost

Blue Mtn 25,000 445 1 1.78% 1 0.004%

Smoky Hill 25,000 149 0 0.60% 4 0.016%

Gold Hill 25,000 966 5 3.88% 5 0.020%

75,000 1,560 6 2.08% 10 0.013%

Summary of September 1-28, 2010

Tx From: Johnson Co Blue ValleyCentury

Twrs Totals/Avg Rpts Sent 72678 101091 120940 294709

OP City Hall Lost Rpts 2326 2785 2774 7885 % Loss 3.20% 2.75% 2.29% 2.68%

Fire Training Cntr Lost Rpts 31 75 21 127 % Loss 0.04% 0.07% 0.02% 0.04%

To eliminate false setting by anomalous readings: Limit correction based on plausible drift rate Lengthen time in lock before taking readings

Lengthened preamble affects capacity Affects first block only Impact diluted as traffic increases

Size of required deadband controls available slot time; 100 msec will be adequate 500 msec slots can be used for most gage sites Capacity of 1 channel is 120 gages, 331 KBytes/

hour 2 sec slot (repeater) can carry 630 Kbytes/hour or

157,500 ALERT Messages

Ready for new ALERT Concentrator applications

Low power repeater for 2011

Vendors are working on gage applications

Implementation of Protocol Application layer

Thank you