The new method differs from the previous method in several aspects. The locations of water levels and their section criteria for interpolation are more flexible than the previous method. Ability to incorporate user defined flood barriers as coverage provides an excellent opportunity to overcome the limitations inherent in digital terrain models. It also becomes useful in evaluating “what if” or post project scenarios. The new method provides several options to present flood depth data that are not available in the older method. In addition to conceptual and computational differences between two methods, you will also notice following changes while using the new method:
Water levels are read as a scatter data set as opposed to flood stages at TIN vertices.
The method does not require “streams” in the TIN.
Multiple events or water level time series can be read as oppose to a single event. User can choose an event while delineating floodplain.
User can specify flood barriers as features in the flood barrier coverage and the new method incorporates those features during flood depth computation.
Computed flood depths are stored as TIN data set and saved along with the TIN.
Multiple flood depth data sets can be created in a TIN from multiple events.
In addition to displaying flood depth as contours, this method can also create flood extent and classified flood depth coverage.
It is now possible to compare two different flooding scenarios by creating a flood impact coverage.
Finally flood extent, classified flood depth, and flood impact coverages can be exported as shapefiles for reporting or other flood management purposes.
Related Topics:
Overview of Flood Plain Delineation