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Baseline Pattern (optional)
This drop-down list defines an optional time pattern whose factors adjust the
baseline inflow to vary in a periodic fashion by month of the year, by day of
the week, and by time of day (for both weekdays and weekends). If this dropdown list is left blank, then the baseline inflow is not adjusted. Click the [...]
browse button to display the Sanitary Time Patterns dialog box to define a new
time pattern.
Time Series (optional)
This column provides a drop-down list item that allows you to select an
already defined time series that contains the tabular data of time versus inflow
for the selected constituent. If this entry is left blank, then no direct inflow will
occur for the selected constituent for the node being defined. Click the [...]
browse button to display the Time Series dialog box to define a new direct
inflow time series.
Scale Factor (optional)
This column specifies the multiplier to be used to adjust the values of the
pollutant constituent's inflow time series. The baseline value is not adjusted by
this factor. The scale factor can have several uses, such as allowing one to easily
change the magnitude of an inflow hydrograph while keeping its shape the
same without having to re-edit the entries in the hydrograph's time series. Or,
it can allow a group of nodes sharing the same time series to have their inflows
behave in a time-synchronized fashion while letting their individual
magnitudes be different. If left blank, then the scale factor defaults to a value
of 1.0.
Inflow Type
For pollutant constituents, the drop-down list allows you to select the type of
inflow data contained in the specified time series data as either concentrations
or mass inflows. This field is not available for the FLOW inflow row.
Conversion Factor
For pollutant constituents, this entry is used to define the numerical
conversion factor for converting a pollutant mass flow rate in the time series
data into concentration times flow units. This field is not available for the
FLOW inflow row.
For example, if the time series data is in pounds per day and the pollutant
concentration defined for the project is in mg/L while the flow units are CFS,
then the conversion factor is (453590 mg/lb) / (86400 sec/day) = 5.25 (mg/sec)
per (lb/day).
Dry Weather (Sanitary) Inflows
The Dry Weather (Sanitary) Inflows section of the Inflows dialog box is used to
specify a continuous source of dry weather flow entering the node being defined.
Dry weather inflows are continuous inflows that typically reflect the contribution
from sanitary sewage in sewer systems or base flows in pipes and stream channels.
They are represented by an average inflow rate that can be adjusted on a monthly,
daily, and hourly basis by applying time pattern multipliers to this average value.
The following data are used to define dry weather inflow:
Constituent
This read-only column provides a list of FLOW and previously defined pollutant
constituents whose dry weather inflow is to be defined.
430 | Chapter 9
Subbasin Element Data