Can I build in a floodway?

A structure may be built in a floodway only if it can be demonstrated through an engineering analysis, commonly referred to as a “No-Rise” study, that the development will not result in any increase in the flood levels during the occurrence of the base flood. A floodway is defined as the channel of a river, or other watercourse, and the adjacent land areas that must be reserved in order to discharge the base flood without cumulatively increasing the water surface elevation more than one foot.

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1. Can I build in a floodway?
2. How can I find out if my property is located in a floodplain?