Wet Weather Flow Models are used throughout the United States for evaluation of the sanitary, storm and combined sewer systems. Models are used for planning new systems or upgrading of existing systems to accommodate growth or to control undesirable overflows and associated water quality
impacts. Models are also used for design of wet weather facilities including sizing of conveyance, storage facilities, pump stations and treatment plants. The challenges in selecting a model to perform evaluations include: 1) understanding the objective(s) to be accomplished 2) knowing
the real world system being modeled (e.g., collections system representation, rainfall data, basin characteristics, etc.) and 3) having a working knowledge of a model's capabilities and features. Often the model is chosen with little available information related to the background processes
involved in producing rainfall-runoff responses or conveyance through a collection system. A third party evaluation of the capabilities and performance of wet weather models would therefore provide a level of confidence in the model's background methods and processes that are not currently
available to the majority of model users and permitters. Providing this performance data in an unbiased manner would facilitate the model selection and application process. A framework for generating this third party data is afforded by the Wet Weather Flow (WWF) Pilot of the Environmental
Technology Verification (ETV) program. ETV was created by the U.S. EPA to accelerate the marketplace acceptance of commercial-ready environmental technologies. Through a cooperative agreement, U.S. EPA and NSF International have partnered to conduct the WWF technologies pilot as part of the
ETV program. The focus of this pilot is verification of commercially available technologies used in the control and abatement of urban stormwater runoff, combined sewer overflow, and sanitary sewer overflow. Because of the recognized need for credible performance data related to wet weather
models, this technology area has been given a high priority. Verification testing is intended to confirm the specific capabilities of a model as depicted in its product literature. This testing has been completed; the results are being reviewed, and may be added to the Conclusions later. A
brief overview of the verification program developed for urban runoff models will be presented. The focus for the remainder of this paper will be on the verification of a specific vendor's software, the XP-SWMM modeling system produced by XP-Software.
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