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Accession Number
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PB2013-101275
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Title
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Refinement and Evaluation of the Massachusetts Firm-Yield Model Version 2.0.
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Publication Date
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2011
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Media Count
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60p
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Personal Author
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A. J. Massey S. A. Archfield S. B. Levin
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Abstract
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The firm yield is the maximum average daily withdrawal that can be extracted from a reservoir without risk of failure during an extended drought period. Previously developed procedures for determining the firm yield of a reservoir were refined and applied to 38 reservoir systems in Massachusetts, including 25 single- and multiple-reservoir systems that were examined during previous studies and 13 additional reservoir systems. Changes to the firm-yield model include refinements to the simulation methods and input data, as well as the addition of several scenario-testing capabilities. The simulation procedure was adapted to run at a daily time step over a 44-year simulation period, and daily streamflow and meteorological data were compiled for all the reservoirs for input to the model. Another change to the model-simulation methods is the adjustment of the scaling factor used in estimating groundwater contributions to the reservoir. The scaling factor is used to convert the daily groundwater-flow rate into a volume by multiplying the rate by the length of reservoir shoreline that is hydrologically connected to the aquifer. Previous firm-yield analyses used a constant scaling factor that was estimated from the reservoir surface area at full pool. The use of a constant scaling factor caused groundwater flows during periods when the reservoir stage was very low to be overestimated. The constant groundwater scaling factor used in previous analyses was replaced with a variable scaling factor that is based on daily reservoir stage. This change reduced instability in the groundwater-flow algorithms and produced more realistic groundwater-flow contributions during periods of low storage.
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Keywords
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Algorithms
Aquifers
Droughts
Firm yield
Ground water
Hydrology
Massachusetts
Meteorological data
Scaling
Simulation
Stream flow
Water reservoirs
Water storage
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Source Agency
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US Geological Survey
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NTIS Subject Category
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48G - Hydrology & Limnology
55C - Meteorological Data Collection, Analysis, & Weather Forecast
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Corporate Author
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Geological Survey, Reston, VA.
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Document Type
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Technical report
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Title Note
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N/A
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NTIS Issue Number
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1303
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Contract Number
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N/A
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