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Every so often, my intention is to add some comments regarding new issues, questions, solutions and other items that may arise regarding ASR, in response to web page response, voicemail, snail mail, my own experiences and other sources. These will necessarily be brief, but may provide a starting point for further discussion. 1. Target Storage Volume (TSV) People often ask how much water do they get back from an ASR well compared to how much they recharge. We call this "recovery efficiency," or the volume of water that you recover divided by the volume recharged. The TSV is an estimate of the volume that has to be placed into storage so that the recovery efficiency is 100%, or as close to 100% as the site can achieve. It is a concept that has evolved during the past few years and is still evolving.
Initial operating experience at several sites is providing an ever-improving basis for estimation of the TSV. Usually, this is expressed in terms of days of recovery capacity. For example, the West Wellfield ASR system for Miami-Dade Water & Sewer Department, Florida, recently tested its first of five new ASR wells. A TSV of 70 days of recovery capacity was estimated for this 5-MGD ASR well, storing untreated groundwater in a brackish, limestone artesian aquifer. The storage zone is about 120 m (400 ft) thick and has an estimated transmissivity ofabout 118,000 gpd/ft.
At other sites in similar karst limestone aquifers, TSV estimates range from a high of about 350 days of recovery capacity to a low of about 50 days. In granular aquifers, the TSV estimates should be much lower. what is ASR / where is ASR / issues/solutions / team ASR / resources / links / contact |
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LATEST EDITION
Aquifer Storage Recovery By David Pyne This is the only book published on aquifer storage recovery (ASR), a cost-effective water storage technology that has evolved rapidly during the past 25 years and is now being applied throughout the world. |
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Introducing ASR
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Focus on ASR sites worldwide
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Important ASR issues...
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Meet ASR technician
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ASR resources at a glance
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How to contact ASR forum
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