Pond Sizing
 

Pond Sizing
With PondPack, you can get your grading plan right the first time by automatically determining storage requirements and pond dimensions using developed pond inflow and target outflow rates. Develop a pond grading plan with confidence for any given inflow/outflow situation, and solve for surface area, depth, or underground pipe size.

Pond Volumes
Once PondPack has estimated the size and dimensions of your pond, simply plug in your design data. PondPack offers several format options for entering pond volume data, giving you the flexibility to easily model a wide variety of pond configurations. Volume data formats include elevation versus contour area, elevation versus planimeter area, and elevation versus volume data. You can even model underground storage by using multiple-barrel circular pipes on grade or entering geometric parameters for trapezoidal basins.
Outlet Structures
 

Outlet Design

Outlet Structures
PondPack uses the industry standard Hydraulic Design Series No. 5 methods from the FHWA to automatically perform outlet calculations. With PondPack, you can model complex outlets in parallel and series for a variety of tailwater conditions and automatically check for inlet or outlet control. Include weirs, orifices, culverts, risers, inlet boxes, and any user-defined structure in your design. You can then generate single, multi-stage, or complex rating curves for interconnected pond analysis.

Watershed Modeling

Channel Routing
PondPack gives you a variety of options for modeling hydrologically significant channel reaches within a watershed network. Attenuate flows and account for travel time by routing hydrographs through geometrically shaped channels such as pipes and trapezoidal ditches, or through irregularly shaped natural channel sections. Available channel routing methods include Muskingum, Translation, and Modified Puls.

Hydrograph Addition
PondPack allows you to add an unlimited number of hydrographs at any pond, confluence, or outfall and automatically overlay the plots for the individual and composite hydrographs.
 

Pond Routing
Pond routing is a mathematical procedure that models a detention pond’s response to a given storm event. By routing a stormwater hydrograph through a pond, engineers can determine how the water surface elevation, outflow, and storage values vary during and after the storm event of interest. Options include routing a single pond, multiple ponds, interconnected ponds, and variable tailwater conditions. PondPack also allows you to model unlimited diversions by computing flow splits for ponds with multiple outfalls.
 

Interconnected Pond Modeling (ICPM)
Pondpack’s sophisticated routing features enable you to easily and accurately route complex ICPM situations. In many scenarios, downstream conditions cause backwater effects that influence performance of detention pond outlet structures. A pond may discharge to another pond that is close in elevation, or to a location influenced by downstream tidal effects or flooding. Such conditions can result in decreased outlet discharge rates, or even reverse flow back into the pond. These situations can be extremely difficult to model correctly. Some approaches simplify the problem through overly conservative assumptions about downstream water surface elevations that can result in oversized facilities and excessive costs. Others ignore the downstream effects entirely, resulting in overtopping of undersized ponds. With PondPack’s advanced ICPM capabilities, there is no need to compromise the integrity of your solution. Leveraging the technically sound algorithms native to PondPack, you can model these complex scenarios with confidence.