In this Act—
“flood” means the temporary covering by water from any source of land not normally covered by water, but does not include a flood solely from a sewerage system (and related expressions such as “flooding” are to be construed accordingly),
“flood risk” means the combination of the probability of a flood and of the potential adverse consequences, associated with a flood, for human health, the environment, cultural heritage and economic activity,
“flood solely from a sewerage system” means the temporary covering of land by sewage caused solely by a failure in or blockage of a sewerage system which is not connected with any loading on the system by external hydraulic factors (for example by heavier than usual rainfall or higher than usual river levels).