Network Levels:

• Node: sensor component
• Neighborhood: hydraulically linked nodes (6 camera nodes, 1 stage node, 1 gateway for demo)
• City: geographically linked neighborhoods
• Manager of RTMs

Variables:

Variable Name	Description	Level	Value	Default Value	Options (count)
Area Threshold (at)	# of inundated pixels constituting flood	Node	Discretized (every 10%)	10%	10
Stage Threshold (st)	Depth of water constituting sewer backup	Node	Continuous	5 cm
Monitoring Period (mp)	Time interval between wake ups in monitoring mode	> neighborhood	Discrete	24 hours	5 (1, 3, 6, 24, 72 hrs)
Emergency Period (ep)	Emergency mode sampling period (camera node)	> neighborhood	Discrete, bounded at minimum sampling period	Min sampling period	3 (2, 5, 10 minutes)
Flooding check Period (fp)	Period that flooding status is checked/decided at the neighborhood level	> city	Discrete	10 minutes	6 values (10, 20, 30, 40, 50, 60 minutes)

Messages:

Basic information:

Sensor outputs:

Monitoring mode:

• Time stamp (to what level)
• Tilt/roll/yaw (IMU)
• delta IMU (IMU)
• GPS
• Temp
• RH
• Battery level
• Floodmap
• Stage
• Flood status
• Classification model updates*

Emergency mode:

Flood Code Positive Conditions (thresholds for neighborhood emergency mode):

• inundated pixels for any node in neighborhood > Area Threshold

• Storm sewer stage > stage threshold
• Manually defined (user or API directive)
• If > 2 nodes inundate pixels in adjacent neighborhood > Area Threshold
• If any condition has been reached in time < ff

Monitoring Mode:

• Monitoring Period (mp):
  • Wake up
  • Check for change in IMU
  • Check for change in GPS
  • Check battery level
  • Check for flooding -> Count flooded pixels -> NO FLOODING/FLOODING
  • Go to sleep

Emergency Mode:

• At flood check period (period):
  • Send node emergency mode status
  • Check neighborhood emergency code designation, if emergency
• At Emergency Period (ep):
  • Check for flooding
    • If flooding, send alert
    • Send node flood code (emergency heartbeat)
    • Start counting flooded pixels
    • If inundated pixels FOR ANY NODE > Area Threshold
      • Compare with previous capture
        • If number of inundated pixels > previous capture, assume flood growing
          • Save bitmap + image to SD card
        • If number of inundated pixels < previous capture, assume local maximum
          • Transmit bitmap
          • Save bitmap