any solution for getting rid of these creatures Can they harm plants?
Not sure what sort of creatures you're talking about. Can you post a photo or a better description?
Most of the invertebrates in the garden make a useful contribution to the eco-system and are friends to the gardener.
dark brown/black in colour leap about a foot high and look exactly like shrimps
Where are you Jennifer?
Jennifer are you in the USA? Are these the creatures?
Yes Dovefromabove is right. I looked up her ref. as I live in Dorset & have this pest in their hundreds for the 1st time ever and we are flooded on out patio & front door porch. Thanks for your advice.