Pushing the Water Efficiency Envelope: Regional Designs for a Sustainable Supply


  • Lisa Krentz - Hazen and Sawyer

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As the costs of new supply development continue to increase, water conservation and demand management activities may become a more critical element of the water supply planning process.

A Demand Management Plan (DMP) is currently being developed for Tampa Bay Water that explicitly defines demand-side management as a beneficial tool for long-term supply planning and how it relates to agency’s long-term planning process, supply reliability and Member Government demand. Tampa Bay Water, a regional water supply wholesaler, provides water to six Member Governments serving a population of approximately 2.5 million people in the Tampa Bay region.

This presentation describes the results of an extensive investigation designed to:

1. quantify and describe water use and economic characteristics of Tampa Bay Water’s Member Government customers,
2. estimate the impact of previously implemented water efficiency measures
3. identify customer preferences and acceptability of potential water conservation programs
4. assess demand management potential, benefits and costs

The various dimensions of demand dynamics were explored to identify trends and patterns operating across different user groups and communities, affecting the timing and quantity of future supply needs as well as opportunities for increasing water efficiency.

In support of its various planning and management efforts, Tampa Bay Water has develop an integrated water consumption database, which contains monthly, account level billing data dating back to 1998 for each of its Member Governments. This data represents over a half-million water use accounts across the region, geocoded to local property appraisers data through a parcel identification number. As part of Tampa Bay Water’s current DMP update, the water consumption database was enhanced to improve the alignment of billing records with property appraiser data and other external data to support the investigations of variance in regional water use and efficiency potential. In addition to increasing the potential number of metrics available for the study, these enhancements also served to improve the sectoral disaggregation and precision of data used to benchmark water use.

The presentation offers an innovative approach to information management and lessons learned from the perspective of a comprehensive regional water use profile conducted for the Tampa Bay Water DMP. It provides innovative solutions for improving the accuracy of accounting for external factors, which influence variance in water use and offers direction on how to use this information to articulate and validate a long-term water demand management and planning strategy.

To request a copy of the full paper, please contact the author at lkrentz@hazenandsawyer.com.

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