SVPA-12

SVPA-12: NE 138th St at Wild Canary Farm

Status	ACTIVE
Upstream	SVPA-15W 124th West
Downstream	USGS-9 Duvall

Attributes

• Est. 2019
• Road - NE 138th St
• Ditch
• Dry when not flooding
• Mounted on utility pole

Installation Notes

Problems and Considerations (May 2020)

• Sensor Height – mount at least 14.5’ above bottom of ditch (must be > 2’ higher than current)
  • Mount out over center of ditch.
  • Cantilever arm must be level and static.
  • Sensor should be moved from NNW to more of a NW orientation to be directly over the ditch to get the best possible readings.

• RSSI issues – poor RSSI since this location is farthest from receiver and is in a topographic hole.
  • Mount transmitter and antenna as high as possible (use existing telephone pole?)
  • Mount transmitter and sensor separately.
  • Use 30’ sensor with longer cable.

• Access issues – location is immediately adjacent to gravel road, but height poses problem.
  • If transmitter is mounted separate from sensor, both will need to still be accessible for battery changes, maintenance.

• Sensing Cone Issues – the cone of detection is very wide at the ground level.
  • Sensor should be mounted at minimum height requirements to minimize size of cone.
  • Vegetation will need to be cut back extensively along ditch edges.
  • Sensing cone least 44.23” (diameter of cone at ground level).

Links

• Floodzilla
• Google Map