Flooding

In the latest version, all of the flooded areas become flooded at one time - the forecastArrivalTime. That is, every geometry in the file floodedFilename is added to the water layer, and people/roads which intersect with these are inundated/flooded.

Previously, a version existed which used the depth of inundation for each geometry to approximate the ordering of the flooding. In this version, the assumption was that a zone which ultimately flooded to 10cm deep would flood first; some linear unit of time later, the zones which ultimately flooded to 9cm would flood. Another time step would see the 8cm zones flooding, etc. The very shallowest areas which flooded would be updated last. These were controlled by three factors:

• the file referenced by floodedFilename, which had a column called depth, denoting the final depth of inundation;
• forecastArrivalTime was the time at which the deepest areas would begin flooding;
• the time step between areas flooding, set to an hour by default.

This served as an imperfect workaround when data specifying the spatiotemporal spread of flooding was unavailable.