Community Rating System (CRS) Report

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In an effort to encourage municipalities to go above and beyond the
minimum requirements set by FEMA for flood mitigation, NFIP (National
Flood Insurance Program) offers a voluntary program that provides
incentives for municipalities to reduce flood risk. In order to receive
the offered discounts on flood insurance premium rates, Village staff
must provide proof that they are actively analyzing, managing, and
mitigating flood events on a regular basis. Much of the report consists
of paper work and spreadsheets proving that Village staff has been
actively responding to flood complaints, planning for future events, and
maintaining infrastructure that prevents flooding. Additionally, there
is a series of maps and datasets that are managed in GIS, which assist
Village engineers in flood mitigation. Therefore the CRS report
requires specific map and datasets displaying the information that
supports flood mitigation.
Since the Village has been actively
managing and analyzing the floodplain, it was quite easy to merge a
bunch of existing datasets into a single map in order to show the way in
which GIS supports flood mitigation.

As shown in the image, the Village’s GIS maintains layers such as
flood boundaries, building drip lines, parcel data, elevation data, and
impervious surface data amongst many other things. All of these
features allow for analysis on past flood events, which in return
provides information to mitigate future flood events. For example, by
referencing this data the Village engineers can quickly find out which
homes are in the floodplain, what the drainage situation on their
property consists of, and what the odds of a major flood event occurring
on their property might be. This information is then used to plan
future development and fix issues in current problem areas. Without the
use of GIS, the engineers would have to rely heavily on outdate maps,
manual calculations, and extended research in the field.