Showing posts from May, 2018

Head loss due to Transitions and Fittings (Local loss) for InfoSWMM and SWMM5

Head loss due to Transitions and Fittings (Local loss) Whenever flow velocity changes direction or magnitude in a conduit (e.g., at fittings, bends, and other appurtenances) added turbulence is induced. The energy associated with that turbulence is eventually dissipated into heat that produces a minor head loss, or local (or form) loss. The local (minor) loss associated with a particular fitting can be evaluated by where   V         =          mean velocity in the conduit (m/s, ft/s) K         =          loss coefficient for the particular fitting involved. The table given below provides the loss coefficients (K) for various transitions and fittings. Table 3-3: Typical Minor Loss Coefficients Type of form loss K Expansion Sudden D1 < D2 Gradual D1/D2 = 0.8 0.03 D1/D2 = 0.5 0.08 D1/D2 = 0.2 0.13 Contraction Sudden D1 > D2 Gradual D2/D1

Rules and Ranges the for Hydrology Options in InfoSWMM and InfoSWMM SA

Subcatchment Hydrological (Modeling) - Data TableThis table contains all subwatershed data that is used to estimate the amount of  runoff and pollutant yielding from Subwatersheds. For more information on each of the input (data fields) in this table, Subcatchment editor may be referred.  The following table is in invert colors and shows the whole first row of the DB Table on separate rows in the image.
Field Description Subcatchment ID User determined ID.  It can only be changed with the Change ID command. Raingage ID Specify Raingage ID used to input rainfall data to Subcatchment. Receiving Node ID Node ID for node receiving rainfall hydrograph from Subcatchment. Subcatchment Area Area of Subcatchment Subcatchment Impervious (%) Percentage of the Subcatchment covered by impervious surfaces. Subcatchment Width Characteristic width of the Subcatchment (feet or meters). Subcatchment Slope (%) Slope of the Subcatchment. Subcatchment Curb Length Total length of curbs in the Subcatchment (any length un…