Determining Flood Risk |

FloodRiskAnalysis differs from FloodRiskDetailAnalysis in that a single overlap percentage is determined by merging all nearby flood zones into a single geometry using a union operation, then comparing the location to that single geometry.

This dataflow is similar to FloodRiskDetailAnalysis but has some important differences:

- There are two paths in this dataflow, one for determining the geoconfidence shape and one creating a shape that encompasses all nearby flood plains.
- There is a
**Flood Union**stage that combines all nearby flood zones into a single geometry by performing a spatial union operation. This is necessary because the dataflow later performs an intersection operation comparing the address or intersection's geoconfidence surface with a geometry representing all the nearby flood plains. - There is a
**Record Combiner**takes the geoconfidence surface and the polygon representing the nearby flood plains and combines them so that each record now contains the address, a buffered point or polygon representing the area around the address, and a polygon representing the nearby flood plains.