Factors Affecting Firm Yield and the Estimation of Firm Yield for Selected Streamflow-Dominated Drinking-Water-Supply Reservoirs in Massachusetts

Abstract

The water-balance equation (equation 1) is solved for each month of the historical record in chronological order. The yield, Q y , is initially set equal to zero and is incrementally increased until the reservoir's usable storage is completely depleted during no more than one month of the simulation period. The resulting yield-the final value of Q y-is considered the firm yield of the reservoir. The firm yield calculated from the historical record does not include precipitation to or evaporation from the reservoir's surface. [Reservoir ID: identifier from figure 3. Altitudes are relative to NAD 83. AREA, reservoir drainage area plus surface area; PREC, average annual precipitation; SNOW, average annual snowfall; SOIL, maximum soil retention; B-ELEV, average drainage basin altitude; C-SLOPE, mean channel slope

A science plan for a comprehensive assessment of water supply in the region underlain by fractured rock in Maryland

“…A regression analysis to determine the best equation for use in estimating the flow statistic for ungaged sites in the region must then be performed. Statistical methods for estimating daily time series at ungaged sites are have been effective in southern New England (Fennessey, 1994;Waldron and Archfield, 2006). These methods have been refined, modified, and applied to additional sites in New England and Pennsylvania (Archfield and others, 2010;Archfield, 2009;Marla Stuckey, U.S. Geological Survey, oral commun., 2012).…”

Computing daily mean streamflow at ungaged locations in Iowa by using the Flow Anywhere and Flow Duration Curve Transfer statistical methods

“…By the use of a reference streamgage, the flow-duration curve is converted to a time series. As explained in Waldron and Archfield (2006), the observed time series of streamflow at the reference gage (Q) ( fig. 2A) is used to develop a flow-duration curve ( fig.…”

Massachusetts reservoir simulation tool—User’s manual

“…Reservoirs should be entered such that for each contributing and receiving reservoir pair, the contributing reservoir is entered before the receiving reservoir. System configurations for the reservoirs in the database can be found in Waldron and Archfield (2006) and Levin and others (2011). For each contributing and receiving reservoir pair, a watershed configuration is selected.…”

“…The database of the Massachusetts Reservoir Simulation Tool contains 70 reservoirs; these are reservoirs for which data were collected during the studies by Waldron and Archfield (2006) and Levin and others (2011). To simulate a reservoir that is not included in the database, the user should select the "Add a reservoir to the database" button on the opening screen, which then produces the "Add a new reservoir to the database" dialog box ( fig.…”