The IPGC

The IPGC clearly provides more open surface area to capture surface runoff: The abundant open area provided by the IPGC allows for more runoff water to enter the pipe which results in a lower ponded depth of water during storm events. Therefore, the IPGC will clearly out perform PVC tees with grate caps. The IPGC drainage pipe will perform as a gra... te inlet, catch basin, and storm drain all at the same time. If the open flow area provided on a pipe surface exceeds the cross sectional area of the pipe itself, which occurs with relatively short sections of IPGC, the pipe size will dictate the amount of flow that can be conveyed. As seen in the above photo, the IPGC provides substantially more open flow area on the pipe surface than the standard perforated PVC pipe. The following text discusses several of the inadequacies associated with perforated pipe that the IPGC will effectively accomodate. The IPGC open slits allow for an unsubmerged flow state if installed fully or partially above the ground surface at the capture point. Each IPGC open slit will perform as a one-sided weir (on-grade) or a two sided weir (in a sump) until the contributing flow is large enough to submerge the entire pipe. The point at which the IPGC open slits become submerged is dictated by several factors inlcuding the pipe size, pipe slope, and the contributing flow rate. The section length of the IPGC is another important factor as larger spans contain more open slits (or open slit area). If used as a sump inlet, the standard perforated PVC pipe would become submerged at a lower flowrate than the IPGC since: The standard perforated pipe was never intended to capture runoff at the ground surface and is therefore installed beneath the surface. The runoff must first infiltrate the bedding material before it could be captured and conveyed by a buried perforated pipe. Once the bedding material begins to saturate, the perforated pipes will begin to convey. However, if the open slits on the IPGC can be at least partially exposed, conveyance ...Read More