drains for secondary storage tank

huangyhg

drains for secondary storage tank
how is rain water dealt with in a secondary confinement facility such as a dyke that surrounds an above ground storage tank?  thanks.
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we either collect it into a sump with a manually operated sump pump or have a normally closed valve at the low spot that plant staff opens after a rainstorm.
obviously you can't have anything that automatically drains the rainwater without inspecting it.