SWMM56

Subject: Reserve Capacity and Flow in a Link The Reserve flow and Reserve Capacity are modeling guidelines and do not actually influence the computed flows in a link. If you have a positive Reserve flow or capacity then you MAY get more flow in the link based on the current flow being less than the Qfull for the link but not if the link is under surcharge, has backwater conditions or has large entrance and exit losses. You cannot always assume that because the Reserve flow is positive the link can handle more upstream flow. Here are few graphs that show the relationship between Qfull, the actual Q in the link and the Reserve Flow or Reserve Capacity. The Qfull is a reference flow and is not used during the computation in InfoSWMM and SWMM5. Condition 1: Positive Reserve Flow – the flow is always less than Qfull and the Reserve flow and Reserve Capacity are Positive. Condition 2: Negative Reserve Flow – the flow is sometimes greater than Qfull and the Reserve flow ...

Note: What Node and Link Invert Elevations Does SWMM 5 Use? SWMM 5 uses the following Node information from the user: · Node Invert Elevation, · The Node Rim Elevation which is the Node Invert Elevation + the Maximum node depth · The Ponded Area when the Ponded Area option is used · The Surcharge Depth above the Node Rim Elevation SWMM 5 uses the following link information from the user: · The Link Upstream Offset Depth or Offset Elevation and · The Link Downstream Offset Depth or Offset Elevation · The Link Maximum Depth or Diameter SWMM 5 calculates the following information internally : · The Pipe Crown Elevation at the upstream and downstream link nodes. The Pipe Crown is the Pipe Diameter + Link Offsets · The Node Highest Pipe Crown Elevation, · The Surcharge Depth above the Rim Elevation if the Node has a Surcharge Pressure Depth at the Node during the simulation, o If the Surcharge ...

Note: Static Gravity Main Report Shows steady state simulation results for all gravity mains in tabular format. The report displays one record for each gravity main in the current H2OMAP Sewer project. Gravity main report columns include the Node Identifier, Total Flow, Unpeakable Flow, Peakable Flow, Coverage Flow, Infiltration Flow, Storm Flow, Flow Type, Velocity, d/D, q/Q, Water Depth, Critical Depth, Full Flow, Coverage Count, Backwater Adjustment, Adjusted Depth and Adjusted Velocity. The following variables are displayed on the Static Gravity Main Report in the Output Report Manager for all or selected gravity mains: 1. ID - Gravity main identifier. 2. From Node - ID of upstream node. 3. To Node - ID of downstream node. 4. Diameter - Inside pipe diameter for circular channels, in (mm). 5. Channel Depth - Maximum depth of a conduit (for non-circular channels only), in (mm). 6. Channel Width - Top/Bottom width of a conduit (f...

Note : Static Loading Manhole Report Shows steady state simulation results for all manholes in tabular format. The report displays one record for each manhole in the current H2OMAP Sewer project. Manhole report columns include the Node Identifier, Rim Elevation, Load, Overload and Grade, surcharge status, occurrence of a hydraulic jump across the node and the unfilled and surcharged depth. The following variables are displayed on the Static Loading Manhole Report in the Output Report Manager for all or selected manholes: 1. ID - Manhole node identifier. 2. Rim Elevation - Manhole node elevation, ft (m). 3. Base Flow - The base loading applied to the manhole (before peaking), flow units . 4. Total Flow - The calculated flow (after peaking), inserted into the manhole, flow units. 5. Storm Flow - Peak storm load at the manhole, flow units 6. G rade - Manhole node hydraulic grade for the steady state simulation, ft (m). 7. ...

Note: InfoSWMM and H2OMAP SWMM can import any version of the RDII Unit Hydrograph data from SWMM 5.0.001 to SWMM 5.0.021 using the Import manager command. The difference is that SWMM 5.0.013 and earlier versions had less initial abstraction data and versions after SWMM 5.0.014 had more initial abstraction data. However, the Import Manager detects the version and imports the data correctly. SWMM 5.0.013 stored 9 RTK and 3 Initial Abstraction parameters and later versions 9 RTK and 9 Initial Abstraction parameters. InfoSWMM will import any format into the current version of InfoSWMM or H20MAP SWMM, which is based on SWMM 5.0.018 but will soon be based on SWMM 5.0.021. SWMM 5.0.001 to 5.0.013 RDII UH Data SWMM 5.0.014 to 5.0.021 RDII UH Data InfoSWMM and H2oMAP SWMM will have 9 RTK and 9 Initial Abstraction Parameters.

Note: How to Import Subcatchments from GIS into InfoSWMM Step 1: Add your shapefile using the Add Data command. Step 2: Your imported shape file has no subcatchment data before we initialize the project. Step 3: Add your subcatchment data using the GIS Exchange Cluster Import Step 4: Now you have the Subcatchments in the DB Tables and can now calculate the area. ===================================== Step 1: Add your shapefile using the Add Data command. Step 2: Your imported shape file has no subcatchment data Step 3: Add your subcatchment data using the GIS Exchange Cluster Import Step 4: Now you have the Subcatchments in the DB Tables and can now calculate the area. We still have to enter 1/10000 to get the right units for subcatchment area using the Auto Area Calculation under Tools preferences. You first import the shape file and then you turn on Auto Area Calculation, enter a value for the Area Scaling Factor and then use the tool Utilities, Update ...

Note : A workaround for Hydrology only models that send all subcatchment flow to the pervious area. Briefly, v16 had a total infiltration of 14 inches in the attached model but v21 has a total infiltration of 3.5 inches. The input file uses the attached rainfall file and it routes all of the flow to the pervious area of the subcatchment. If you plot the losses in v16 and v21 you will see that the losses stop after about 30 days in v21 and continue in v16. I found that if you put in a small evaporation rate (0.01 inches/day will do) then v21 will duplicate the answers of v16. Looking at the depths in the subcatchment it seemed in v21 without evaporation that the depth in pervious area was stuck at the depression storage value. In summary – the problem seems to be that the losses stop after the depth in the pervious area is above the depression storage unless you have evaporation to sort of kick start the infiltration losses again.