Welcome to floodam.cba
floodam.cba is an R library for estimating
indicators for costbenefit analysis (CBA) applied to flood management
policies.
This library has been developed within the French working group “GT
AMC” which aims at developing methodologies for the economic appraisal
of flood management policies. In this context, the development of
floodam.cba has received the support of the French
Ministry in charge of the Environment.
What floodam.cba can do
floodam.cba is based on :
 a synthetic description of the situation of exposure of a territory
to floods
 a description of the impact of projects on this situation.
Specifically, floodam.cba needs:

flood exposure situation
 description of how the different stakes are impacted by the flood
for a set of scenarios, which can be done in two ways:
 by monetarized damages
 by other quantitative metrics (number of assets, surface area of
assets, etc.)
 description of the flood scenarios, mainly :
 an indicator of their rarity through return periods
 and, if relevant, an indicator of the rarity of the associated
subscenarios (e.g. if a collective intrastructure may fail)

project impacts :
 effects of projects, mainly how they change the flood exposure
situation of the territory, as well as other possible impacts
(environment costs for instance)
 implementation conditions (shortterm costs, longterm costs,
implementation schedule).
From this information, floodam.cba can calculate the
following indicators:
 average annual damage (AAD) and equivalents for other metrics for a
given situation
 average annual damage avoided (AAD) and equivalents for other
metrics between two given situations.
 chronicle of monetary an non monetary impacts of projects
 net present value (NPV) of projects supplemented by other efficiency
indicators such as
 the ratio of benefit divided by cost
 the minimum length of time horizon for the project to be efficient
(if applicable)
 project costeffectiveness indicators such as
 number of residents avoided in floodplain divided by cost
 number of employees avoided in floodplain divided by cost.
What floodam.cba cannot do
floodam.cba cannot (and is not intended to) :
 calculate the return period of flooding scenarios
 calculate the hydraulic impacts of projects
 calculate damages from the intersection of hydraulic modeling, land
use modeling and damage functions. This is what
floodam.spatial does.
floodam.cba cannot (but should at some point be able
to) :
 calculate the uncertainty of the estimated indicators
 perform a sensitivity analysis of the estimated indicators
 calculate the indicators from a “continuous” perspective.
How to get floodam.cba ?
For the moment, ask us. It will be public soon.
How to help for the development of floodam.cba
Contact us.