An accurate dye dilution testing protocol using Rhodamine WT was developed and used to quantity flow meter accuracy in the Greater Detroit Regional Sewer System. Over 150 tests were performed on 3 7 flow meters in conjunction with a set of good metering practice principles. A summmy of the accuracy for each of the seven technologies tested before and after good metering practice is given. The seven technologies assessed are electromagnetic induction meters (magmeters
Rainfall dependent inflow and infiltration (RDII) can be modeled in different ways using the United States Environmental Protection Agency Stormwater Management Model (SWMM). This includes using the RDII shape and volume routines in the SWMM RUNOFF module; using typical combined area parameters for a reduced sub-basin area to produce an inflow response; and using baseflow factors in EXTRAN or the groundwater routine in RUNOFF to produce an infiltration response. Regardless of methods used to model RDII, quantifying RDII can be performed by an even wider variety of methods, typically tailored to local conditions as no one method is universally applicable (Shultz et al.).For this chapter, the RDII shape and volume routines in RUNOFF are used. Total wet weather response is allocated based on understanding of connected footing drains tributary to the sanitary collection system and supporting sewer metering and footing drain flow monitoring data. Footing drain contribution to RDII is important to the local conditions of the Ann Arbor sanitary collection system (Sanitary Sewer Overflow Study Task Force; Sherman et al.; Stonehouse et al.; Zawacki et al.). In Ann Arbor, an extensive Footing Drain Disconnection (FDD) program is currently underway. The citywide model's hydrology required characterization that could be used to prioritize FDD work as well as allow ready updates to the model hydrology as work proceeds.
Establishing consistently accurate sanitary sewer bills is not only important for budgeting and fairness, but is also important for system planning and operation. The Detroit Water and Sewerage Department (DWSD) established a technologically sophisticated and innovative program that allows all stakeholders to provide input and direction on how to develop consistently accurate billing data that is fair to all. The program consists of a set of good metering practice guidelines and separate forums for technical issues and opportunities to provide input into DWSD's policy making decisions. The program serves as a model to all service providers on how to build confidence in their data, minimize disputes, and maximize the use of their data for uses often not considered.The GDRSS program evolved over a 10 year period, each advancement building on the success of previous activities. Today, the GDRSS program consists of several forums and detailed protocols that establish an extremely high standard for flow meter data accuracy and use for billing and planning. The effort to perform this work has more than paid for itself as billing disputes have nearly been eliminated and billed volume issues have been corrected. It is estimated that overall system accuracy has improved from under billing by 15% to billing accuracy to within 2.5%. This allows the operators of the collection and treatment system to focus on better overall system management and planning. Furthermore, sophisticated methods for data correction have been established that are only possible by fully implementing this program. Finally, one of the most important outcomes of this work is that when disputes arise, customers feel they have adequate forums to discuss concerns and ultimately feel they are dealt with fairly
As part of its long-term wastewater master plan (WWMP), the Detroit Water and Sewerage Department (DWSD) is preparing a regional analysis to assist in eliminating sanitary sewer overflows (SSO) and to enable municipal customers to comply with federal and state SSO regulations. The purpose of the regional analysis is to find costeffective solutions for SSO abatement from the DWSD service area. Several local studies will be incorporated into the regional analysis. The analysis will evaluate the following alternatives:Elimination of the sources of high infiltration and inflow (I/I) that cause SSOs Local storage or treatment of SSOs Regional transmission, storage, and treatment of SSOs This paper first describes the DWSD service area and explains the short-term state regulations and potential long-term state and federal regulations driving the regional SSO analysis. Next, the seven key elements of the regional SSO analysis are outlined and explained. Finally, this paper provides examples of how the seven key elements are being applied in the DWSD service area and the corresponding results.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.