Using drones during Flood events.

Using drones during Flood events.

As drones have become more popular, their benefits during a disaster or other natural event has been recognised by numerous agencies and individuals.

During an event in Scotland in 2016, we were called upon by SEPA at very short notice to try and image some flooding over a large are. Whilst we were able to deploy at short notice it highlighted some safety concerns and also the practicalities of using drones during a large flooding events.

Depending on the agency, the drone imaging requirements can vary:

  • Geospatial and public sector clients tend to require point clouds, photogrammetry and other GIS outputs,
  • Insurance; video and still imaging
  • News and reporting; video and stills. LIDAR can also offer benefits especially in regard to mapping but currently has some limitations on drones.

Drone Platforms for Flood Imaging and Mapping

Whilst this is a general survey of the pros and cons of rotary verses fixed wing, and there are some exceptions, these apply to  majority of drone service providers.

Rotary Wing

  • Pros:
    • Easier & Quicker Deployment
    • Can take off in small areas
    • Video and stills
    • Oblique and Nadir imaging
  • Cons:
    • Limited flight time
    • Total area per flight limited to @75ha
      • (Standard permissions)
    • Typically <20min flight time
  • Fixed Wing
    • Pros:
      • @1 hour flight times
      • Up to 200ha per flight, (EVLOS), 1000ha+ in a day
      • UK CAA more likely to approve extended distances due to reduced risk
    • Cons:
      • Needs large area for take-off and landing
      • Needs Extended Visual Line of sight approvals from CAA for best use and return on investment
      • Nadir images only, no video on most platforms

Operating Drones Safely for Flood Survey

During a large flooding event, where there is large scale risk to life, limb or property, and emergency controlling authority (ECA) will be established. Typically this will the local Police force, but they may differ to the Fire Brigade who will be better equipped to co-ordinate and respond.

It is our experience that there many other “air users” during a flood, Search and Rescue, (SAR), Police, Coast Guard, Armed Forces, News Helicopters as well as hobby drone pilots and other commercial drone pilots. It is therefore important when operating drones in these areas that the flights are coordindated with the Emergency Controlling Authority, (ECA) if one is in control.

Using Video as Survey Data

  • Weather a consideration, most drones don’t like rain and wind needs to >20mph
  • Other airspace users may create additional risks
    • Police, Military, Hobby etc, need to coordinate with other agencies
  • Gaining landowner permissions at short notice difficult *
    • Drone provider could be classed as CAT 2 responder *
  • Large flood areas may be better to use manned aircraft *
  • Varied Datasets required for Environment Agencies, Local Authorities, Insurance Companies etc, sharing of data ?
  • Drone mapping using RGB cameras may be limited to flood extent
  • Video imaging needs tied to platform that can visualise location, direction of view / time & date

 

Turkey Red Media is part of a UK wide contract which mobilises during large flood events, on behalf of a number of agencies, including Public Sector, Insurance and Geospatial