Solutions for a Sustainable Environment.

Software solutions for a sustainable environment... XP Solutions provides software technology and professional solutions to engineering organizations, environmental management organizations, and government agencies worldwide to plan, design, simulate and manage the physical and social environment.

Flood Improvement And LID Modeling Using XP‐SWMM   What's New In xpswmm/xpstorm v2013   Dam Breach & Emergency Action Plans
Flood Improvement And LID Modeling Using XP‐SWMM   What's New In xpswmm/xpstorm v2013   Dam Breach & Emergency Action Plans



<B>xpdrainage</b> Drainage Design Software
xpdrainage Drainage Design Software

xpdrainage is a sustainable drainage design software for urban planners, civil engineers, and landscape architects. It leads the user through the entire drainage design process from conceptual design to water quality analysis to hydraulic flow analysis of the surface and subsurface.

<B>Micro Drainage</b>
Micro Drainage

Micro Drainage software enables sustainable urban drainage systems (SUDS, WSUDS, LIDs) to be designed, audited and tested for exceedance.


xpsite3D is an intelligent design package for sitework, roads and highways. It provides full control of very rapid 3D views of all aspects of your designs – above and below ground.

<B>xpwspg</b>: Hydraulic Analysis Model That Computes Uniform And Non-Uniform Steady Flow
xpwspg: Hydraulic Analysis Model That Computes Uniform And Non-Uniform Steady Flow

New xpwspg is an easy-to-use hydraulic analysis model that computes uniform and non-uniform steady flow water surface profiles and pressure gradients in a network of open channels and closed conduits.

<B>xpswmm</b>, Dynamic Storm Water & Wastewater Model
xpswmm, Dynamic Storm Water & Wastewater Model

xpswmm is a comprehensive software package for dynamic modeling of stormwater, river systems, floodplains and  sanitary or combined systems.  It combines one-dimensional (1D) calculations for upstream to downstream flow with two-dimensional (2D) overland flow calculations so that you can see what truly happens to your stormwater or sewer system when waters flow, populations increase or catastrophic events hit.

<B>xpstorm</b>, Dynamic Storm Water Model
xpstorm, Dynamic Storm Water Model

xpstorm is a versatile software package for dynamic modeling of urban stormwater systems, river systems and floodplains including ponds, rivers, lakes, floodplains and interaction with groundwater. This combined 1-dimensional (for upstream to downstream flow) and 2-dimensional (for flow over land) software is widely used by private consultants and public agencies responsible for stormwater and flooding regulation, xpstorm is one of the most stable and well-accepted modeling and design packages in the world, and has been tested and approved for use by the United States FEMA and UK Environment Agency.


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XP Solutions

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Portland, OR 97221


Phone: 888-554-5022

Fax: 888-554-5122

Contact: Sales


  • The XPDRAINAGE Treatment Train Approach
    The XPDRAINAGE Treatment Train Approach

    In this webinar you will see how to apply xpdrainage to a site in order to compare pre- and post-development flows and water quality for various LID practices.

  • 2D Modelling Series Pt 1: Modelling with Different Cell Sizes
    2D Modelling Series Pt 1: Modelling with Different Cell Sizes

    Webinars are XP Solutions' way of reaching out to discuss not only the tools we design, but the hot topics in water collection in our present world. XP-Live Webinars provide an opportunity for experts in their fields to offer demonstrations in concepts and practices in design, modeling, planning, reviewing and more. XPertorials are shorter webinars that provide tips and tricks for using XP Solutions software products.

  • Introduction To xpdrainage
    Introduction To xpdrainage

    This is a workflow overview of the all-new xpdrainage software for stormwater drainage design. This is an evolving software program that allows engineers to evaluate pre- and post-development surface water runoff, including water quantity and quality.

  • XP Solutions Releases XPSWMM And XPSTORM Version 2014

    XP Solutions, a world leading provider of software solutions aimed at improving the physical and social environment, proudly announces the release of XPSWMM and XPSTORM version 2014.

  • Flood Improvement And LID Modeling Using <B>XP‐SWMM</b>
    Flood Improvement And LID Modeling Using XP‐SWMM

    Over the years, a number of severe storms have impacted the Harris Gully watershed, including Tropical Storm Allison, which resulted in $5 billion in damages in 2001. Inundation was especially severe at the downstream portions of Harris Gully, where Rice University and the Texas Medical Center are located. A1D/2D hydraulic model (XPSWMM) was instrumental in simulating and evaluating the effects of a proposed drainage alternative.

    By Andrew Juan, Dr. Nick Fang, and Dr. Philip Bedient, Rice University

  • New R&D Report On Benchmarking The Latest 2D Models Reveals The Power Of XPSTORM/XPSWMM And XP2D

    XPSTORM (with XP2D) performed strongly in the latest round of 2D benchmarking tests conducted on behalf the UK Environment Agency.

  • Modeling BMP's In Sensitive Areas With xpswmm

    The clarity of Lake Tahoe has been declining since the mid-1960s because of the deposition of fine particles and nutrients from urban runoff. A program to control the quality of runoff entering the Lake employs the xpswmm comprehensive software package to simulate a detailed system of pipes and channels with surface and subsurface flow. Learn how the model has worked well as the initial planning-level model and eventual design model.

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Established in 1974, XP Solutions is a world leading provider of industry standard sustainable drainage and flood hazard software for the civil engineering and environmental sectors. Our reliable software technology and professional solutions are used every day around the world by government agencies, engineering companies and environmental management organizations to plan, design, simulate and manage the impact of human interaction with the natural world.

XP Solutions brings nearly 40 years of experience in developing and supporting professional software systems devoted to improving our use and understanding of water resources, and has expanded its expertise to include a broader scope of designed infrastructure. From designing drainage systems and managing water quality, to mapping flood risk and emergency response and road and site design, our solutions provide our clients with the efficient tools needed to promote safer communities, sustain ecosystems, optimize infrastructure investment, and manage environmental impact.

Our Clients
XP Solutions is devoted to developing tools that allow our clients to succeed in their project work. Our clients range from small engineering firms where one or two engineers provide site planning and drainage design, to global professional service companies that have teams of hundreds providing water resource management and environmental services, to governmental agencies charged with regulating and protecting the infrastucture of the world.

When you work with us, you will find that we are committed to more than providing a product; we are committed to earning your confidence through advancing technology, supportive relationship and problem-solving solutions.

Our People

XP Solutions is comprised of professional engineers, accomplished software development professionals, and dedicated client service managers – all armed with a wealth of industry knowledge and experience working together to provide solutions to our clients. With company teams in North America, Australia and the United Kingdom, augmented by distributors around the world and a network of professional research and development associations, our people possess the expertise and innovation built into each of our software solutions.

Dam Breach & Emergency Action Plans

By Michael Crenshaw, P.E., CFM
Storm and Flood Products Manager

The actions taken in the initial minutes of an emergency are critical.  A practical Emergency Action Plan comes from a reasonable risk assessment to identify potential emergency scenarios.   XP Solutions Engineers look at the assessment of dam/levee breach scenarios, floods and Emergency Action Planning through effective modeling.

Coupled 1D/2D Modeling Tools for Single-Event Stormwater & Floodplain Management Applications
by Daniel Parsons, P.E., CFM
Project Engineer at
Interflow Engineering LLC

xpsite3D Webinar

Learn about our exciting new site and road design software package. xpsite3D, which can be a standalone tool or compliment to existing CAD packages, has been developed over the past four decades by engineers who use the software.  This webinar reviews some of the many time-saving and automated tools for road system, junction and roundabout design as well as inevitable design review. You will also see a demonstration of the fully engineered outputs and visualisation tools.

Detailed 1D/2D Modeling Webinar

By Ryan Retzlaff
Senior Water Resources Designer at Cardno WRG

An application of 1D/2D modeling in Josephine County, Oregon with a detailed discussion of the 1D and 2D interaction across the entire study area. This case study contains a 1D element which floods, travels over land in the 2D domain, then enters a different 1D element. This occurs over and over with 6 different 1D elements. So if one drop of water was followed, theoretically it could move from the original 1D element and in and out of five additional elements while crossing over the 2D domain in between. The study was completed as part of a stormwater masterplan and therefore includes all major elements across the entire catchment. 

Linked Surface And Subsurface Modeling Webinar
Presented by Tom Ryan, P.E., Senior Project Manager at RBF Consulting, a Baker Company

Surface flood modeling within urbanized areas has traditionally been performed using 1-D modeling techniques, i.e. HECRAS modeling for FIRM preparations. The recent implementation of 2D surface flow modeling has allowed urbanized areas to be modeled more accurately, but lack the subsurface drainage infrastructure interface.
Click here to view the webinar.

Dam/Levee Breach Modeling
presented by Colby Manwaring, P.E.
101MB, 0:54:34

A discussion of xp2D’s capabilities to assist in emergency action planning and flood mapping of levy breaches, dam breaches and catastrophic pipeline / canal failures.
Click for video and resources.

FEMA Floodplain Mapping Recorded Webinar
presented by Colby Manwaring, P.E.

This webinar discusses tools for flood mapping from 1D and 2D modeling including:

  • Generation of profile plots and cross section plots
  • Tools and processes for exporting 1D and 1D/2D flood extent results to CAD/GIS for DFIRM mapping
  • Fully automated 1D/2D flood extent mapping and Base Flood Elevation (BFE) generation.

Join XP Solutions Engineers for free online seminars to discuss important water resources issues, or view recorded presentations.