Accession Number PB2013-101275
Title Refinement and Evaluation of the Massachusetts Firm-Yield Model Version 2.0.
Publication Date 2011
Media Count 60p
Personal Author A. J. Massey S. A. Archfield S. B. Levin
Abstract 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.
Keywords Algorithms
Aquifers
Droughts
Firm yield
Ground water
Hydrology
Massachusetts
Meteorological data
Scaling
Simulation
Stream flow
Water reservoirs
Water storage


 
Source Agency US Geological Survey
NTIS Subject Category 48G - Hydrology & Limnology
55C - Meteorological Data Collection, Analysis, & Weather Forecast
Corporate Author Geological Survey, Reston, VA.
Document Type Technical report
Title Note N/A
NTIS Issue Number 1303
Contract Number N/A

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