A system for removing particulates from liquid and inducing drag in a liquid flow, wherein the system is configured for insertion into a manhole thereby creating a sump region below the system, wherein the system comprises: a partitioning portion positionable above the sump region , wherein the partitioning portion includes: a first region comprising a funnel and a sump inlet aperture ; and a second region comprising a sump outlet aperture ; a plurality of drag-inducing portions (850a-c) positionable proximate a sidewall of the manhole in the sump region , and wherein the drag-inducing portions (850a-c) project inwardly when installed toward a central axis of the sump region ; a first supporting portion ; a second supporting portion ; a third supporting portion ; and a fourth supporting portion ; wherein each of the first supporting portion , second supporting portion , third supporting portion and fourth supporting portion are positionable proximate to the sidewall of the manhole in the sump region and comprise: a first drag-inducing portion ; a second drag-inducing portion located below the first drag-inducing portion ; and a third drag-inducing portion located below the second drag-inducing portion ; wherein the first drag-inducing portions , the second drag-inducing portions and the third drag-inducing portions are attached to each of said first to fourth supporting portions (860a-d); and a weir extending upwardly from the partitioning portion and positioned between the first region from the second region . a partitioning portion positionable above the sump region , wherein the partitioning portion includes: a first region comprising a funnel and a sump inlet aperture ; and a second region comprising a sump outlet aperture ; a first region comprising a funnel and a sump inlet aperture ; and a second region comprising a sump outlet aperture ; a plurality of drag-inducing portions (850a-c) positionable proximate a sidewall of the manhole in the sump region , and wherein the drag-inducing portions (850a-c) project inwardly when installed toward a central axis of the sump region ; a first supporting portion ; a second supporting portion ; a third supporting portion ; and a fourth supporting portion ; wherein each of the first supporting portion , second supporting portion , third supporting portion and fourth supporting portion are positionable proximate to the sidewall of the manhole in the sump region and comprise: a first drag-inducing portion ; a second drag-inducing portion located below the first drag-inducing portion ; and a third drag-inducing portion located below the second drag-inducing portion ; wherein the first drag-inducing portions , the second drag-inducing portions and the third drag-inducing portions are attached to each of said first to fourth supporting portions (860a-d); and a first drag-inducing portion ; a second drag-inducing portion located below the first drag-inducing portion ; and a third drag-inducing portion located below the second drag-inducing portion ; wherein the first drag-inducing portions , the second drag-inducing portions and the third drag-inducing portions are attached to each of said first to fourth supporting portions (860a-d); and a weir extending upwardly from the partitioning portion and positioned between the first region from the second region . <EOS>