Corrugated stormwater chamber having sub-corrugations

Abstract

A plastic arch-shape cross section corrugated stormwater chamber has a multiplicity of crest corrugations and valley corrugations which run transverse to its length. Sub-corrugations run along part or all of the arch-curve lengths of either crest corrugations or valley corrugations, or along both of them. A sub-corrugations are smaller in dimension than an associated crest corrugation or valley corrugation. Sub-corrugations may taper in width and depth and may taper to nothingness. A compound convex shape end cap, useful for closing off the ends of stormwater chambers, has substantially vertical corrugations with analogous sub-corruptions.

1 - 24  (canceled) 
     
     
         25 . A chamber comprising:
 a base;   a plurality of crest corrugations and a plurality of valley corrugations positioned along a length of the chamber;   at least one crest sub-corrugation running along at least a portion of a crest corrugation;   at least one valley sub-corrugation running along at least a portion of a valley corrugation;   an end crest corrugation positioned at a terminal end of the chamber; and   an end crest sub-corrugation running along at least a portion of the end crest corrugation.   
     
     
         26 . The chamber of  claim 25 , wherein the end crest corrugation includes a substantially constant width. 
     
     
         27 . The chamber of  claim 25 , wherein the end crest corrugation includes a tapering width. 
     
     
         28 . The chamber of  claim 25 , wherein the end crest corrugation includes a height less than a height of the crest corrugations. 
     
     
         29 . The chamber of  claim 25 , wherein the end crest sub-corrugation is positioned along a top portion of the end crest corrugation. 
     
     
         30 . The chamber of  claim 25 , wherein the end crest sub-corrugation includes terminal ends positioned above the base. 
     
     
         31 . The chamber of  claim 25 , wherein the end crest sub-corrugation includes terminal ends positioned at the base. 
     
     
         32 . The chamber of  claim 25 , wherein the end crest sub-corrugation includes a tapering height. 
     
     
         33 . The chamber of  claim 25 , wherein the end crest sub-corrugation includes a substantially constant height. 
     
     
         34 . The chamber of  claim 25 , wherein the at least one valley sub corrugation includes a tapering height towards the base. 
     
     
         35 . The chamber of  claim 25 , wherein the at least one valley sub corrugation includes a substantially constant width. 
     
     
         36 . The chamber of  claim 25 , wherein the end crest corrugation includes terminal ends positioned at the base, and the end crest sub-corrugation includes terminal ends positioned above the terminal ends of the end crest corrugation. 
     
     
         37 . A chamber system, comprising:
 a chamber including:   a base;   a plurality of crest corrugations and a plurality of valley corrugations positioned along a length of the chamber;   at least one crest sub-corrugation running along at least a portion of a crest corrugation;   at least one valley sub-corrugation running along at least a portion of a valley corrugation;   at least one crest sub-corrugation running along at least a portion of a crest corrugation;   at least one valley sub-corrugation running along at least a portion of a valley corrugation;   an end crest corrugation positioned at a terminal end of the chamber; and   an end crest sub-corrugation running along at least a portion of the end crest corrugation; and   an end cap coupled to the chamber, the end cap including a flange configured to overlap the end crest corrugation of the chamber.   
     
     
         38 . The chamber system of  claim 37 , wherein the flange of the end cap includes a recess having a protrusion configured to engage the end crest sub-corrugation. 
     
     
         39 . The chamber system of  claim 38 , wherein the protrusion is shaped to follow contours of the end crest corrugation and the end crest sub-corrugation. 
     
     
         40 . The chamber system of  claim 38 , wherein the protrusion is configured to abut against the end crest sub-corrugation to couple together the chamber and the end cap.