Bio-retention Cells are depressions that contain vegetation grown in an engineered soil mixture placed above a gravel drainage bed. A storage layer water depth below which an open drain automatically closes. A code re-factoring error that crept into the inertial term of the momentum equation was corrected. The fraction of this amount that remains on the surface is whatever is left over after all of the redistribution options are satisfied. A new error message is now generated if a user-prepared rainfall file has its dates out of sequence.
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The 2 GB binary output file size limit for runs made under the GUI that was inadvertently added into release 5. As a result, it is now permissible to use hydrographs whose time to peak is shorter than the rain gage recording interval. Curve Number infiltration was modified to use only direct precipitation, not including runon or internally routed flow, to compute an infiltration rate.
The default is 0. The following processes can be modeled for any number of user-defined water quality constituents:. A typical sand filter system consists of two or three chambers or basins. The control setting for a Xwmm was not being accounted for when computing an equivalent orifice coefficient for surcharged flow or when computing flow through a V-notch weir see link.
The possibility that the initial setting of an orifice was not being made correctly was eliminated see link.
The hydrology component of SWMM operates eap a collection of subcatchment areas divided into impervious and pervious areas with and without depression storage to predict runoff and pollutant loads from precipitation, evaporation 50 infiltration losses from each of the subcatchment.
Engine Updates An "Ignore Rainfall" analysis option was added that causes the program to only consider user-supplied external inflow time series and dry weather flows and ignore any rainfall inputs that would otherwise produce runoff. Rule premises can now test whether a link has been open or closed for a specific period of time.
The capture ratio is the ratio of the rain garden's area to the impervious area that drains onto it. Wet ponds are frequently used for water quality improvement, groundwater rechargeflood protection, aesthetic improvement or any combination of these. The Pump Summary Report was expanded to include number of start- ups, minimum flow, and time off both the low and high ends of the pump curve.
It is the method of choice for systems subjected to significant backwater effects due swmmm downstream flow restrictions and with flow regulation via weirs and orifices. An error condition now occurs if a pump's startup depth is less than its shutoff depth.
Rain harvesting systems collect runoff from rooftops and convey it to a cistern tank where it can be used for non-potable water uses and on-site infiltration.
Epx possibility that ponding could occur at the inlet wet well node for a Type I pump was added see dynwave. Separate accounting and reporting of evaporation and seepage losses in storage units is now made.
Storm Water Management Model - Wikipedia
Accounting for Hydrologic Processes. This can swnm in attenuated and delayed outflow hydrographs as inflow is routed through the channel. If the top width of the overland flow surface for an LID is zero then any excess water above the surface storage depth simply spills out instantaneously.
They provide storage, infiltration and evaporation of both direct rainfall and runoff captured from surrounding areas. Similar to treatment functions, the equation can be any mathematical expression that uses dpa same ground- water variables that appear in the standard equation. The procedure for finding a cross-section area given a section factor value was corrected for the case where the section factor table does not have its highest value as the last entry in the table.
Hourly evaporation time series can stop a SWMM run. The formula used pea recover infiltration capacity during dry periods for the Modified Horton method was revised.
Storm Water Management Model
Runoff reduction via green infrastructure practices. Engine Updates A bug that prevented Weir and Outlet settings from being updated after they were changed by control rules was fixed see link.
Error was added to detect if the size of the binary results file would exceed the 2. Node surcharging is now only reported for dynamic wave flow routing and storage nodes are never classified as surcharged.
Storm Water Management Model (SWMM)
Epz updates A subcatchment's depression storage depth, its pervious surface roughness Mannings n swmn its hydraulic conductivity can now be adjusted on a monthly basis by assigning monthly time patterns to these properties. Using the maximum allowable change in depth at a node as a criterion for selecting a variable time step was restored.
Before, flooding was only recorded when there was no ponding and node overflow was lost from the system see dynwave. The same is true for the bottom of orifices, weirs, and outlets.
See the Users Manual or the Help file for details.