Q in peak wet weather calculator11/18/2023 ![]() The capabilities in the SSOAP toolbox are fully document in the EPA's report " Computer Tools for Sanitary Sewer System Capacity Analysis and Planning (PDF) (104 pp, 3.7 Mb, About PDF ) and " SSOAP Toolbox Enhancements and Case Study (PDF) " (53 pp, 2.6 Mb, About PDF ). If more of the total R value is allocated to R 2 and R 3, this will indicate that the RDII is primarily infiltration driven. A high R 1 value indicates that the RDII is primarily inflow driven. The RDII volumes of three unit hydrographs are designated as R 1, R 2, and R 3. The R i parameter is the fraction of rainfall volume entering the sewer system as RDII, T i is the time to peak, and K i is the ratio of time of recession to T i. The RTK method is based on fitting up to three triangular unit hydrographs to an observed RDII hydrograph (shown above) to estimate the fast, medium, and slow RDII responses. The selection of this method for quantifying RDII in the SSOAP toolbox is documented in the EPA's " Review of Sewer Design Criteria and RDII Prediction Methods. Specifically, this approach employs the RTK method to characterize the RDII response to a rainfall event. SSOAP uses the synthetic unit hydrograph (SUH) approach for predicting RDII. The SSOAP toolbox was developed from a cooperative research and development agreement (CRADA) with CDM Smith Inc., a global consulting, engineering, construction, and operations firm. Also, it provides an effective means to assess the post-rehabilitation performance of the sewer system using the pre- and post-sewer capacity analysis. The RDII prediction methodology employed in the SSOAP toolbox offers an effective means to design a focused sewer condition assessment program and maximize the success of field investigation efforts. This toolbox includes EPA's Storm Water Management Model Version 5 (SWMM5) for performing dynamic routing of flows through the sanitary sewer systems. The SSOAP toolbox is a suite of computer software tools used for the quantification of RDII and help capacity analysis and condition assessment of sanitary sewer systems. There is a need to develop methodologies and computer tools to assist communities in developing an optimal capital improvement program, while providing flexibility for future improvements. Excessive RDII can also cause serious operating problems at wastewater treatment facilities. The extent of infiltration also correlates with the condition of again sewers. RDII is the main cause of sanitary sewer overflows (SSO) to Rainfall-derived infiltration and inflow (RDII) is the increased portion of water flow in a sanitary sewer system that occurs during and after a rainfall as a source of operating problems in sanitary sewer systems. This screenshot of the EPA SSOAP Toolbox (Version 2.0) shows the relationship flow of the following six tools that can be used to help analyze capacity and condition of a sanitary sewer system: 1) Database Management Tool, 2) RDII Analysis Tool, 3) RDII Hydrograph Generation Tool, 4) SWMM5 Interfacing Tool, 5) SWMM5 Tool, and 6) Condition Assessment Support Tool.
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