Rainfall Dependent Inflow and Infiltration from the EPA SWMM 5 Hydrology Manual
7.1 Introduction
Rainfall dependent (or rainfall-derived) inflow and infiltration (RDII) are stormwater flows that enter sanitary or combined sewers due to "inflow" from direct connections of downspouts, sump pumps, foundation drains, etc. as well as "infiltration" of subsurface … Read the rest
The relationship between the Various InfoSWMM H2OMap SWMM
Versions and SWMM5
The relationship between ICM
, ICM SE, InfoSWMM, InfoSewer
, H2OMap Sewer, and SWMM5. InfoSWMM can import H2OMap SWMM, SWMM5, H2OMap Sewer, InfoSewer can export … Read the rest
A.1 Units of Measurement
| Parameter | US Customary | SI Metric |
| Area (Subcatchment) | acres | hectares45 |
| Area (Storage Unit) | square feet | square meters |
| Area (Ponding) | square feet | square meters |
| Capillary Suction | inches | millimeters |
| Concentration | mg/L (milligrams/liter) ug/L (micrograms/liter) Count/L (counts/liter) | mg/L ug/L Count/L |
| Decay Constant (Infiltration) | 1/hours | 1/hours |
The Simulation Options dialog box is used to adjust some facet of a model prior to a model run. Simulation options are usually altered to be associated with a given scenario.
For example, suppose the user wishes to specify a peaking equation for one model run that differs … Read the rest
Arc Map Voronoi Maps for InfoSWMM 2D
There is a certain beauty in Arc Map Voronoi Maps.
This help file topic contrast the St Venant Solution for InfoSWMMH2OMap SWMM 
, InfoSewer/H2OMap Sewer
and ICM/ICM SE
.
The assumptions behind Lumped and Distributed Models along … Read the rest
ArcGIS backwards conversion for #INFOSWMM, #INFOSEWER and #INFOWATER
If you make the MXD a zero byte file it will strip away any Arc GIS specific information which allows you IWDB or ISDB folder to be used in any version of Arc GIS. You can do the following to make the … Read the rest
DWF Allocation in #INFOSWMM and #INFOSEWER – closest Junction Option
1. Add Thiessen polygons layer to all of the junctions to have a Junction ID connection (using the Tool in the DWF Allocator)
2. Use the population columns to populate the DWF field
3. The meters in each of the … Read the rest
How to Rectify Offset Issues in InfoSWMM and H2OMap SWMM
1. Use Tool preferences to use elevation Rim Elevations (instead of depths) and elevation link offsets (instead of depths)
2. Once these flags are set you need to divide all of the link offsets by 2 to get the original … Read the rest
How are Flooded Time, Surcharged Time and Flooded Volume Calculated in InfoSWMM and H2OMAP SWMM?
How are Flooded Time, Surcharged Time and Flooded Volume Calculated in InfoSWMM and H2OMAP SWMM?
The time, volume and flooded rate shown in the InfoSWMM and H2OMAP SWMM Report File Node Flooding Summary (Figure 2) … Read the rest
