In recent years the increased development of valleys and rural areas with hard surfaces has contributed to the increased levels of water running off into the land.
This has had a severe effect on watercourses where flash flooding has occured downstream, where the volume of water entering can be extremely high due to the cumulative effect of development upstream.
Global warming and rising sea levels have impacted on the levels of rainfall which has resulted in severe flooding in specific areas. A consequence of this being, In these areas it is becoming increasingly difficult to obtain insurance against flooding.
When a stormwater attenuation system is used the risk of flooding is reduced as the system holds onto the excess water during a storm and then gradually releases it back into a watercourse in a controlled flow.