Areal FEH 99 Return Period calculation for polygons

As part of our aim of continuing to add complex rainfall analytics into MAP Rain we have added the Areal FEH 99 return period calculation that lets you create the areal return period for a polygon – this is the methodology as set out in the Flood Estimation Handbook.

How to run

From the dashboard click on Rainfall Return Period

Set the date you are interested in using the top date selector

Select the polygon you are interested in

Select the “Get Return Period for Item” option under Rainfall Return Period

MAP Rain will then calculate the Areal FEH 99 Return Period and display all the coefficients and results in the map results pane along with a graph of the rainfall intensity for 3 days – includes the previous and the next days.

Click here for more information on MAP Rain