which of the following is a possible benefit of flood mitigation efforts?
o
they can open a floodplain area for public use.
they have no maintenance costs.
they can prevent hurricanes and other damaging storms.
o
they result in lower taxes

They have no maintenance costs

Explanation:

Some flood mitigation measures have absolutely no maintenance costs. One significant one is the enactment of a policy that revokes any kind of settlement or human activities in flood zone areas. Flood zone areas are regions where water drains naturally hence providing proper natural drainage. Keeping these regions unobstructed will definitely mitigate flood damage to built environments because they'll be less likely to get flooded.  

answer; the above statement is (true);