Ellicott City security cameras could offer useful and real time flood information

Ellicott City security cameras could offer useful and real time flood information

by Sanita Vetra-Carvalho

We have come across an illustrating source of a network of security cameras capturing a flash flood in Ellicott City, Maryland, US on Sunday 27th of May 2018. The video is a collage of 12 cameras all located on or near the Main Street in Ellicott City. The information from these videos would have been useful at the time of the flooding.

The videos clearly show how the Patapsco River and two out of its four tributaries (Tiber River and Hudson River) rapidly swell and overflow. We see how this results in the Main Street also becoming a fast flowing river with water washing away cars, destroying buildings, and accumulating debris. The flood lasted only four hours but caused catastrophic damage to local infrastructure, residents property, and claimed a life of a National Guardsman [1,4].

Figure 1. The map showing Ellicott City, Maryland and adjacent rivers. Image credit USA Today.

 

The cameras were installed by a local property owner, Ron Peters and can be seen in this YouTube video:

 

The flooding event

A storm released nearly two months of rain, over 9 inches (24cm) in just two hours (3 to 5pm local time), which swept away several roads, cars and brought more than 10 feet (3.0 m) of rapidly moving water down Main Street in the Old Ellicott City [1]. The old city is a very urban area set in a valley next to Patapsco River and its four tributaries. Due to the urban landscape the rainfall has nowhere to go except for running down the valley to the main river.

This was the second 1-in-1000 flood event within two years in Ellicott City. Both 2016 and 2018 events claimed lives and caused millions of dollars in damage [1,4]. However, flooding is nothing new to this city.  The city officials are looking into introducing green areas in the city to allow the rain water to be absorbed into the ground reducing the surface runoff.

 

New flood alert system

Associate Professor Nirmalya Roy and his group from University of Maryland Baltimore County (UMBC) are working on using a network of temperature and liquid sensors and have produced a new flood warning system for Ellicott City [2,4]. They are also working on using the local flood related information from social media such as Twitter into the flood alter algorithm which warns public through loudspeakers in the city [3,4].

It is clear that the videos captured from these security cameras provide a rich source of water information of the rivers and the Main Street. Information such as water levels and surface velocities can be extracted from these videos [5] and used as part of an existing flood warning system or an independent one. Further, videos also capture additional information on floods and damage caused that is valuable to rescue teams, insurance companies etc.

[1] https://www.wypr.org/post/ellicott-city-flood-nothing-new
[2] mpsc.umbc.edu/wp-content/uploads/2018/12/BipendrBasnyat_Thesis.pdf
[3] https://userpages.umbc.edu/~nroy/UMBC%20prof%20from%20Ellicott%20City%20developing%20flood-warning%20system.pdf
[4] https://wtop.com/howard-county/2019/02/emergency-sirens-will-inform-residents-in-historic-ellicott-city-md-flood-zone/
[5] https://flood-obs.com/non-contact-monitoring/

Highlights of the EUMETNET Crowd Sourcing Workshop 2019

Highlights of the EUMETNET Crowd Sourcing Workshop 2019

EUMETNET, is a grouping of 31 European National Meteorological Services which is provides a framework for collaboration between its members in the meteorological and hydrological fields. You can find out more about EUMETNET and its missions here.

ON 12-13th of March 2019 EUMETNET held a Crowd Sourcing Workshop at the Met Office in Exeter, UK, which a number of us from DARE attended remotely. The workshop was attended by a large number of the EUMETNET members both in person and remotely.  The topics covered included:

  • description of the Met Office observation network (WOW) and their move to a cloud based data system;
  • the existing crowd sourcing platforms across the Europe (see the list below);
  • summaries of other recent crowd sourcing meetings/workshops;
  • data related issues such as data format, quality control, storage, data sources and legal issues.

From the various talks it was clear that there is a great opportunity for crowdsourced data to contribute to meteorological forecast accuracy, in particular to nowcasting and more timely warnings since observations had higher spatial resolution in the established crowd sourcing platforms. However, the collected data types and their quality control varied greatly between the various crowdsourcing platforms discussed. For example, e.g. AEMET, concentrate on collecting singular atmospheric observations which are characterised by being local, rare, of significant intensity and with the capacity to cause high social impact. While, the Met Office Weather Observation Website (WOW) system accepts all types of observations from various types of sources.

Three necessary condition for success with novel observations. Slide from Malcolm Kitchen (Met Office) talk at the EUMETNET Crowd Sourcing Workshop from 12-13th March 2019 at the Met Office, UK.

 

Distinction between crowd sourced and opportunity data, such as smartphone pressure measurements, car temperature data, aircraft data was also made. Leading to an important discussion on collection of such data which often requires collaboration with industry e.g. car manufacture, mobile network provider etc. Should companies release such opportunity data for the mutual benefit through improved forecasts and warning systems? A number of companies already release their data, however, these are exceptions rather than the norm currently. There is no coherent agreement on how this would be uniformly achieved in practice which remains an open question for the debate.

List of various crowd sourcing platforms discussed at the workshop: