Reduce Sanitary and Combined Sewer Overflows

Reducing sanitary sewer overflows (SSOs) and combined sewer overflows (CSOs) contributes to ecologically sound wastewater management for communities while protecting private and commercial property. Complex networks and unpredictable wet weather events require the right modeling solution.

The Challenge

Stay Ahead of Overflow Events

Innovyze’s portfolio of hydraulic and hydrologic modeling solutions empowers better sanitary and combined sewer network management to address SSOs and CSOs. Work from models you are confident in to evaluate current performance and effectively plan for maintenance, operations, and emergency response. Use live alerts to inform the right actions in the field and provide transparency to the public.

Flooded drain in the road
View through a drainage pipe

Evaluate your options for reducing overflow events:

  • Simulate wet weather conditions to identify risks
  • Find blockages or sources of infiltration and inflow (I&I)
  • Use live modeling to incorporate field and weather forecast data
  • Apply live alerts from your model to inform field operations
  • Evaluate system costs for capacity management and remedial actions

With the right information, you can take preventative measures to reduce overflow volume and frequency – protecting property and the receiving water systems. If you’re facing consent decrees or mandatory compliance, now you can more easily meet the requirements to reduce fines and improve standing with your community.


“We have used a variety of modeling packages in developing our original Long Term CSO Control Plan [...] the District wanted to take advantage of the benefits of standardizing our CSO models into a common modeling platform. After evaluating the InfoWorks ICM platform, we felt it offered us the best package for our model management needs.”

Devona Marshall, P.E.Northeast Ohio Regional Sewer District

The Solution

  • Conduct Thorough Urban Hydrology Assessments

    The Innovyze portfolio of modeling applications provides specialized products for integrated 1D infrastructure and 2D overland flood modeling. It also contains dedicated solutions for stormwater, sanitary, and combined sewer networks so you can pick the right solution for your network – regardless of size or system complexity. These software applications enable you to confidently model outfalls, weirs, treatment plants, sewer mains, manholes, laterals, and all other components of your collection network.

    Conduct advanced simulations to represent dry-weather and wet-weather flows, Groundwater Infiltration (GWI) and Rainfall Derived Infiltration and Inflow (RDII). Use these analyses to determine the right operations to reduce overflow frequency and volume.

    Surface runoff on road
  • Use Live Modeling for a Near Real-Time View During Rainfall

    ICMLive provides a live model that connects supervisory control and data acquisition (SCADA) systems, field telemetry instrumentation, and weather forecasts with existing GIS data and hydraulic models to deliver real-time insights that can help reduce overflow events. The addition of ICMLive provides an invaluable tool for both engineers and operators. In an accessible user interface, you can present forecasted model results to operators to pre-empt overflow events. As a tool in their day-to-day work, ICMLive helps operators to better understand system response to inclement weather. They can return field information to engineers that can be used to update hydraulic models for quick and easy calibration.

    Water engineers consulting plans
  • Understand Contributing Factors to SSOs

    InfoSWMM, InfoSewer, and InfoWorks ICM SE help you to gain a deeper understanding of what causes I&I and blockages. Model your entire network using existing collected GIS data without the need to trim or assume inputs. Use your hydraulic model to provide a holistic view of your complete network and drill down into specific areas to identify problems. With thorough simulation powered by advanced calculations, you can pinpoint areas prone to GWI, RDII, and blockages. Additionally, with InfoSWMM, InfoSewer, and InfoWorks ICM SE, you can provide a representation of load allocation to measure and define use patterns. Calibrate your model leveraging RDII Analyst to build a true digital representation of your sanitary sewer network. You can use the model outputs to confidently make informed decisions. Making the right call leads to proactive system management for improved capacity, operations, and maintenance planning.

    Overflowing drain
  • Evaluate Causes and Remediation Strategies for CSOs

    InfoWorks ICM SE, ICMLive, and InfoSWMM enable you to understand the frequency and volume of a CSO event at each individual outfall location. Use elements from your model to understand when the probability of overflows may impact public health or receiving water quality. Live models built with ICMLive connect SCADA databases, telemetry devices installed at outfalls, and radar data with hydraulic models to predict the likelihood of CSO events, while defining the contributing factors. You can have alerts trigger based on logical variables – such as submerged weirs, flow level, and more – to inform system managers and operators when the likelihood of overflow is predicted to be high.

    Water outfall pipe
  • Mobilize Field Crew and Respond

    When an alert or call comes in to report a CSO or SSO, the priorities are to:

    • Mobilize a crew and get them to site
    • Confirm, diagnose, and fix the spill
    • Report to regulators, residents and businesses
    • Update your records

    Read more about incident response systems  >

    Mobilize Field Crew and Respond
  • Meet Regulatory Requirements and Mandates

    If you’re faced with a consent decree or regulatory action, using Innovyze modeling solutions can facilitate quick compliance.

    Evaluate thousands of potential scenarios to meet mandated standards for CSO or SSO frequency and volume. By performing advanced predictive analytics to generate curves based on cost efficiency and performance, you can be sure your model is giving you the best possible course for action. Work with data and models that you are confident in, with software that has been widely tested and approved by national authorities around the world. Innovyze provides major cities the right tools in the right environment to confidently meet regulatory compliance standards.

    Executive working at a laptop
  • Employ Real-Time Control Strategies

    InfoWorks ICM SE and InfoSWMM let you incorporate Real-Time Control (RTC) logic into your model. This allows for control structures, like regulators, bendable weirs, and telemetry-controlled pumps, to be directly programmed for response during simulations. RTC control logic allows for a comprehensive and dynamic analysis of storage, pump operation, flood gates, and other control structure performance.

    Used to simulate overflow likelihood, risk, cause, and impact, RTC allows modelers to truly evaluate a wide variety of options for improved operations. This can provide invaluable insight into which actions – taken at which time – will have the biggest impact on reducing overflow volume and frequency.  

    Business people shaking hands across a desk

What to look for in a solution for pre-empting CSOs and SSOs

  • It accurately models all components of your storm, sanitary, and combined sewer networks
  • Simulations are conducted quickly and accurately, giving you full trust in the output results
  • Live modeling provides an indispensable tool for engineers and operators
  • Weather forecast data is applicable to predict likelihood of CSOs
  • The right insights for action are accessible across the enterprise, from engineers to operators

Discover more about the software