Hydrodynamic Separation Technologies are restrictive underground gadgets intended to expel floatable flotsam and jetsam (e.g., leaves, garbage, oil) and to expel suspended solids from tempest water overflow by sedimentation. They are intended for tempest water treatment in urban regions to meet tight space imperatives. Constrained information on the suspended solids expulsion execution of introduced gadgets are accessible, and existing information are flawed as a result of the issues related with evaluation by observing. The targets of our examination are to: (1) research the attainability and reasonableness of field testing to survey the exhibition of hydrodynamic separators as underground tempest water treatment gadgets; (2) assess the impacts of silt size and tempest water release on the presentation of six gadgets from various makers; and (3) build up a general methodology for anticipating the presentation of a gadget for some random application. In the field tests, a controlled and reproducible manufactured tempest occasion containing residue of an all around characterized size circulation and fixation was bolstered to a precleaned gadget. The caught residue was then expelled, dried, sieved, and gauged.