Intoduction: InfoSewer is used worldwide by municipal engineers and planners to create detailed, accurate models of their sewer infrastructure systems. These models enable users to evaluate the effect of new developments, zoning changes, and other additional loads on system flows; pinpoint current and future problem areas; predict overflows and backups; and determine how to best restore needed capacity lost to infiltration and inflow with the least rehabilitation. In addition, users rely on these models to compute hydrogen sulfide generation and corrosion potential; analyze the rate of Biochemical Oxygen Demand (BOD) exertion; track sediment movement and deposition; calculate the amount of pollutant transported to the wastewater treatment plant; and assess pollutants’ impacts on receiving waters. Extensive scenario management along with domain and facility management functionality makes the program capable of analyzing existing or proposed sewage collection systems. It has a Steady State, Design and EPS run modes and includes many of the same Arc Map tools that exist in InfoWater and InfoSWMM.
This blog discusses how to use Peaking factors from a Steady State simulation in an EPS simulation. One of the advantages of the three Run options in InfoSewer (Bullet 1 in the image) which are Steady Sate, Design and Extended Period or EPS Modeling is that you can use Peaking Flow Factors for the Steady State Loading Manholes (Bullet 2 in the image). Unfortunately, you cannot use Peaking Factors for EPS simulations which is often a modeling issue. However, you can copy the Total Flow for each node in the Steady State Output Report and use this Total Flow as an EPS “other” loading (Bullet 3 in the image). In an EPS Simulation you can use the Advanced Force Main Modeling option and automatically have flow splits for Force Mains and model more complicated Force Main configurations. If you just simulate the EPS for one hour then you have a quasi steady state simulation with Total Flow (Unpeakable + Peakable) and the Advanced Force Main Solution.
A list of steps you need to take to use the Peak Flow from a Steady State Run in an EPS Simulation include
1. Use Peaking Factor in InfoSewer for Steady State
2. Copy Total Loads at Manholes
3. Use the Total Loads in an EPS simulation
4. Run the EPS Simulation for a short period of time
5. If might help to have two scenarios for this copy and pasting
6. Use the Advanced FM solution for only the EPS Simulation
You can also do this in InfoSWMM and H2OMap SWMM by:
- Run a Simulation with constant flows and SAVE a hot start file
- Rerun the Simulation USING the Saved hot start file for a short period of time.