If you dream of flooding at your workplace, it means your work or company may be in trouble. You may be flustered and scurrying to handle this large amount of work to tackle the flood water.
However, if you dream of flooding in your home, it can mean you will receive large amounts of input which are beneficial to you. If the flood brings in good things, you benefit. For flooding in a semi-public place like your workplace, even if it brings in good, you are not the direct beneficiary as the workplace does not belong to you. Unless of course, you happen to be the owner of the company.