Our technology is used by more than 6,000 clients in over 85 countries. We are dedicated to developing solutions that provide better drainage and water quality, and ultimately improve quality of life.

These solutions are practical and easy to implement globally — promoting healthier communities, sustained ecosystems, increased bio-diversity and reduced environmental impact.

PCSWMM, our principal software, allows engineers to analyze flooding and facilitate responsible urban and natural drainage planning and design. Powerful and scalable, yet easy-to-use and affordable, it continues to be the trusted spatial decision support system for US EPA SWMM and EPANET.

Built with a practicing engineer in mind, PCSWMM streamlines workflow, improves efficiency and accuracy, reduces project time, saves resources, and improves collaboration — all of which enables our clients to be more productive and more competitive.

CHI is made up of professional engineers, seasoned educators and software professionals with a wealth of industry knowledge and a long history (40+ years) of application development.

We are highly committed to technological innovation and continually collaborate with clients to improve tools and develop new applications — our team has published over 200 technical papers on water management.

Whether beginners or seasoned users, our flexible training workshops help clients understand and master the full capabilities of EPA SWMM, EPANET and PCSWMM.

Over 40 years, we've built a solid reputation and are internationally recognized for excellent engineering, modeling and review services. Put our experience, knowledge, and innovation to work for you.

We’ve built whole community platforms to support you. OpenSWMM and OpenEPANET allows users to ask questions, get answers, review and compare the open source code, suggest improvements and share modifications.

The Journal of Water Management Modeling is our peer-reviewed, open-access online journal. It helps modellers expand their knowledge, get insights and discover tips that will help them work more effectively.

Our annual International Conference on Water Management Modeling allows attendees to meet colleagues, exchange ideas, learn from experts and be on the forefront of advances in our profession.

We believe that urban water systems can be designed in a way that supports environmental goals rather than working against them. Our PCSWMM software gives engineers the tools to design urban water systems that are less invasive, less disruptive, closer to the intended natural hydrologic function, and that encourage higher biodiversity. These tools not only facilitate responsible planning and design; they ultimately lead to healthier human communities.

Traditional engineering and its bedfellows have sought to minimize entropy — using methods that ultimately replace natural habitats with surfaces that are generally abiotic or worse.

We believe that the design of sympathetic water systems greatly impacts the quality of life for humankind and all nature. Rather than confining thinking to just Newtonian physics, we believe that practitioners ought to direct their attention further up the hierarchy of concerns towards ecology and Darwinian principles. In this view, a sustainable drainage system is an environment supporting a diverse host of life-forms, which adjusts as the population mix evolves – and which ideally is designed to maximize bio-diversity.

This fostering of a wider biodiversity of plants and animals inevitably encourages the development of thriving human societies.

Guided by a philosophy of sustainable solutions for urban environments, AnthroENG (USA) provides consulting services in hydraulic/hydrologic modeling, environmental monitoring, research, and civil design. Modern approaches in modeling, data science, and IoT technology have enabled water resource engineers to solve old problems with contemporary methods. In partnership with CHI, we provide support of the PCSWMM platform in the United States to help engineers and municipalities with their pressing challenges.

AquaVidya (Laval, Quebec) specializes in urban hydrology, stormwater modeling and water resources planning. Renowned for their analyses of hydraulic problems, they have been involved in projects all over the world, from Northern Quebec to Costa-Rica, from Grenada to Algeria and from Western Africa to Russia.

Providing PCSWMM and EPA SWMM5 training, AquaVidya is a valued CHI partner that has promoted our software for over 20 years.

cba Specialist Engineers (Johannesburg, South Africa) operates as a centre of excellence — providing specialist engineering services by employing the expertise of it's sole member, Chris Brooker and by forming strategic alliances with like-minded professional engineers.

Over the course of each year cba Specialist Engineers provides PCSWMM and EPA SWMM5 training at multiple locations across South Africa.

CWD (India), established with a goal of providing exceptional quality service to their clients in the water resources, environmental and infrastructure planning sectors. Their goal is to partner with each client in developing and providing customized solutions that meets their best needs and exceeds their expectations.

Specializing in the areas of Hydrological & Hydraulic Modelling, Water Treatment Plants (WTPs), Wastewater Treatment Plants (STP/ETPs), Water Distribution & Sewerage Network Design, Pump Station Designs, GIS Services, Stormwater Management, Rainwater Harvesting Systems and Lake Rejuvenation projects.

CWD has a core team with decades of experience in Water Resources & Environmental Engineering fields. We take up challenging projects and provide innovative solutions. We strive for technical excellence. CWD takes pride in our goal of serving every client and project with highest attention they deserve.

Hydropraxis (Montpellier, France) specializes in consulting for sanitation and drinking water, flood risk management, environmental and sustainable development, waste clean energy, alteration/restoration of rivers and civil engineering projects.

A valued CHI partner, Hydropraxis distributes, supports and provides training for PCSWMM EU (adapted version of PCSWMM) in Europe and French speaking countries around the world.

Founded in 1999, Lonwin (Tianjin, China) successfully provides engineering solutions and services in many water-related industries.

As the exclusive CHI partner in China, Lonwin promotes, distributes, trains and supports PCSWMM for the Chinese market.

Opening in 2008, Onno Fortuin Consulting (Western Cape, South Africa) specializes in consulting services for mining, surface water, and environmental engineering projects. They have applied PCSWMM and EPA SWMM5 to a wide variety of advanced mine surface water modeling applications.

Onno Fortuin Consulting helps CHI conduct training sessions throughout South Africa.

As the sole distributor of PCSWMM in Southeast Asia and Australia, Sustainable Water Solution Co. Ltd. provides PCSWMM licensing agreements, training, and technical support for the region. We also conduct modelling and field-based projects that focus on water sensitive urban design and have unique expertise in developing education programs related to modelling and urban water resource management.