Retrofit catch basin for use in storm water management practice

Abstract

A catch basin retrofit that allows stormwater to be diverted from an existing storm sewer to an alternative stormwater management practice (SMP), while maintaining functionality of the catch basin as an overflow device for the alternative SMP.

1 . A method of installing a stormwater diversion and overflow device, the method comprising replacing a frame and grate functioning as an opening for stormwater runoff to enter a catch basin with the stormwater diversion and overflow device to divert stormwater runoff to an alternative stormwater management practice device and redirect excess stormwater runoff exceeding the capacity of the alternative stormwater management practice device back to the catch basin, the stormwater diversion and overflow device comprising:
 a diversion and overflow frame; and   a diversion and overflow cover,   the frame comprising a perimeter member having a first portion extending less than 360 degrees around a perimeter of the frame, the perimeter member at least partially defining an opening through which fluid can flow,   the cover extending beyond the frame on at least one side an amount sufficient to carry stormwater runoff to a storm water management practice system,   the cover bounding the opening, the opening configured to allow stormwater to pass from the stormwater management practice system to the catch basin.   
     
     
         2 . The method of  claim 2 , wherein the stormwater diversion and overflow device further comprises an overflow grate, the overflow grate comprising:
 a vertical portion which comprises at least a portion of a perimeter of the grate; and   at least one slat extending from a first end connected to the vertical portion to a second, unconnected end,   the vertical portion at least partially defining the opening.   
     
     
         3 . A stormwater diversion and overflow device, the device comprising:
 a grate assembly,   the grate assembly comprising a grate and a cover,   the grate having a first side, a second side opposing the first side, a volume between the first side and the second side, and a perimeter member between the first side and the second side, the perimeter member surrounding the volume, the perimeter member defining at least a first opening extending through the grate from the first side to the second side, at least one of the at least a first opening extending through a portion of the perimeter member,   the cover being directly on the first side of the grate and bounding each at least a first opening on the first side of the grate,   the cover bounding at least a portion of each at least a first opening where each at least a first opening extends through the portion of the perimeter member of the grate.   
     
     
         4 . The stormwater diversion and overflow device of  claim 3 , wherein said stormwater diversion and overflow device is retrofitted to an existing street-side catch basin. 
     
     
         5 . The stormwater diversion and overflow device of  claim 3 , wherein the grate assembly further comprises a horizontal member, the horizontal member oriented parallel to the cover, the horizontal member adjacent to the opening. 
     
     
         6 . The stormwater diversion and overflow device of  claim 3 , wherein the cover comprises a plate. 
     
     
         7 . The stormwater diversion and overflow device of  claim 3 , wherein the device further comprises a structural frame into which the grate assembly is configured to set. 
     
     
         8 . The stormwater diversion and overflow device of  claim 7 , wherein the grate is in the structural frame and the cover extends beyond the grate and the structural frame. 
     
     
         9 . The stormwater diversion and overflow device of  claim 3 , wherein the grate comprises grate slats. 
     
     
         10 . The stormwater diversion and overflow device of  claim 3 , wherein the cover is equipped with a drip edge to facilitate distribution of flow off the cover. 
     
     
         11 . A stormwater diversion and overflow device, the device comprising:
 a frame comprising an angle member having a first portion and a second portion, the second portion oriented at an angle to the first portion, the first portion defining an opening through a perimeter of the frame; and   a cover,   the cover support by the frame,   the cover extending beyond the frame and extending beyond the opening in a direction toward which the opening faces an amount sufficient to carry stormwater runoff to a stormwater management practice system.   
     
     
         12 . The stormwater diversion and overflow device of  claim 11 , wherein the first portion is oriented substantially perpendicular to the cover. 
     
     
         13 . The stormwater diversion and overflow device of  claim 11 , wherein the second portion of the angle member is oriented substantially parallel to the cover, the second portion being connected substantially perpendicular to the first portion. 
     
     
         14 . The stormwater diversion and overflow device of  claim 11 , wherein the second portion of the angle member extends 360 degrees around the perimeter of the frame. 
     
     
         15 . The stormwater diversion and overflow device of  claim 13 , wherein the second portion of the angle member comprises an extension on each of four sides of the perimeter of the frame, each extension being substantially perpendicular to each adjacent extension. 
     
     
         16 . The stormwater diversion and overflow device of  claim 11 , wherein the perimeter of the frame has four sides, the first portion of the angle member extending on three sides of the perimeter of the frame, defining the opening on the fourth side of the perimeter of the frame. 
     
     
         17 . The stormwater diversion and overflow device of  claim 11 , wherein the device further comprises a grate supported by the frame, the grate adjacent to the cover, the grate further comprising:
 a first member; and   a plurality of parallel slats having a first end and a second end, the parallel slats extending from the first member at the first end, at least one of the slats remaining free and unconnected at the second end.   
     
     
         18 . A catch basin diversion system, the system comprising:
 the stormwater diversion and overflow device recited in  claim 11 , the stormwater diversion and overflow device being installed in a street;   a catch basin under the street; and   an alternative stormwater management practice positioned adjacent to and off the street.