Hydraulic Drain and Detention Tank

Sometimes we get asked this question quite often: what is the difference between a retention tank and a detention tank? Both tanks are used to collect rainwater. However, there is a difference between detention tank and retention tank, for retention tank is designed to “harvest and retain” the rainwater rather than simply drain it off. The harvested rainwater can then be used for many purposes such as irrigating your plant, washing your cars, flushing toilets, etc. but the detention tank is designed to “detain” water, it holds the rainwater for a limited period only.