---
title: "Steady State Simulation"
canonical: "https://help.innovyze.com/space/infowaterpro/18056091/Steady%20State%20Simulation"
format: markdown
---
**Steady State**

Checking the Steady State box will turn off the simulation time options and a single steady state analysis will be performed when the Run function of the [Run Manager](https://help-innovyze.atlassian.net/wiki/spaces/infowaterpro/pages/18055645) is selected.

**Simulation Time Options**

When performing an EPS, many modeling parameters are dependent on analysis timesteps (intervals) and duration. The following durations and timesteps may be specified:

- Duration - Total length of a simulation in hours. Use 0 to run a single period (snapshot) hydraulic analysis.
- Hydraulic Timestep - Time interval between re-computation of system hydraulics. Normal default is 1 hour.
- Pattern Timestep - Time interval used with all time patterns. Normal default is 1 hour.
- Quality Timestep - Time interval between routing of water quality/temperature constituent. Normal default is 5 minutes (0:05 hours). It is important for a water quality/temperature analysis that this value be no greater than 1/10 the hydraulic timestep.
- Report Timestep - Time interval between times at which computed results are reported. Normal default is 1 hour.
- Rule Timestep - Time interval for which [Rule Based Logic Control](https://help-innovyze.atlassian.net/wiki/spaces/infowaterpro/pages/18055530) rules are evaluated. For greater accuracy, use a rule timestep that is 1/10 the hydraulic timestep.
- Pattern Start - Hours into all time patterns at which the simulation begins (e.g., a value of 2 means that the simulation begins with all time patterns starting at their second hour). Normal default is 0.
- Report Start - Hours into simulation at which computed results begin to be reported. Normal default is 0.
- Start Clocktime - Clock time  (e.g., 7:30 am, 10:00 pm) at which simulation begins. Default is 12:00 am (00:00 - midnight).

Once a simulation time is created, it can be associated with any scenario specified by you or evaluated at any time via selection from the Run Manager.