Conduit Storage Synthesizer

Sewer collection systems serving regions with flat topography and high water table elevation can have large and complex pumping systems since gravity flow may not be ensured for most conduits. H₂OMAP SWMM can dynamically solve these large and complex systems that consist of both gravity conduits and forcemains under a range of extreme conditions often useful in design and planning network updates, pump sizing and capital improvements. Efficient modeling of large collection systems, where most portion of the pipe network consists of pressurized conduits, should involve decoupling the gravity pipes from the forcemain systems so that the two portions are modeled separately accounting for effect of one portion on the other.

Unfortunately, network analysts often deactivate the gravity portions of the network and model only the pressurized network components neglecting the storage available in the gravity portion of the system. The wet-wells draining the gravity networks supply the boundary conditions and inflow points for this decoupled network. However, ignoring the storage available in gravity conduits leads to oversized pump designs, because the available storage volume is much larger than the volume available in the wet-well. H₂OMAP SWMM Conduit Storage Synthesizer (CSS) determines storage capacity in a conduit network based on a dynamic analysis of the system volume under changing heads. This is a significant step forward for modelers who are faced with analyzing collection systems that have large and complex pumping systems along with gravity systems.

H₂OMAP SWMM CSS dynamically computes and returns the gravity-system conduit volume upstream from the wet-well as additional volume to the wet-well - resulting in the most accurate and effortless model decoupling process available. The model computes storage in the gravity conduits at various wet-well depths traversing from the top to the bottom of the wet-well. H₂OMAP SWMM CSS uses the wet-well depth as a boundary condition and determines actual volume of water stored in the gravity conduits at the corresponding wet-well depth.

H₂OMAP SWMM CSS builds depth-storage curve for the gravity portion of the collection system, integrates it with the original depth-volume relationship of the wet-well, and constructs aggregated depth-area curve for the wet-well. Model results are provided in tabular and graphical format enabling easy review. Results could be edited providing the user with the flexibility in deleting some rows from the result table. Once the final area-curves are synthesized, they could be exported to the corresponding wet-wells and could be used to model the forcemain portion of the collection system.

Applied to natural channels, H₂OMAP SWMM CSS will calculate the depth-volume relationship for natural channels and flood plains and could be used to construct flood area maps.