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Long-Range Water Supply Planning

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, , ' ;, ,,'" ~i~ ~ ~I :~ . '\ -' -.- ',.,.'" -.."..~ .-. ~ ::-- -.'\ i" \ CaseAnalysis . ~ . .. Long-Range Surface Water Supply Planning consideredto representthe "safe yield" from . .. the Quabbin and WachusettReservoirs, the Recent projections Indicate that principalsources of supply. eastern Massachusetts must Aftera droughtthat occurredduring the expand its surface water supply mid-1960sthat se~~edas a warnin? to the . area water authorItIes, several studies were system to deuver an adequate undertaken.In 1969,the U.S.Army Corpsof supply during the coming Engineersestimated a potentialshortage of decades. Understanding the up to 140 mgd in the MDC/MWRA supply . area by 1990} In 1977,the now defunct New relatIonships among system EnglandRiver Basin Commission projected storage,reliability and yield is a shortageof 77 mgd by 1990.3In 1978,the essential to the solution of this MassachusettsExecutive Office of Environ- . mental Affairs estimated a shortfall of 70 long-range plannIng problem. mgd by 1990 for communities serviced by the MDC/MWRA.4A current study by the RICHARDM. VOGEL& DAVIDI. HELLSTROM MDC/MWRA, initiated in 1981, projects a shortfall of approximately 120 mgd by the A REPORTdeveloped by the Metro- year 2020.1 politan District Commission(MDC) A principal ingredient of the MDC/MWRA and the Massachusetts Water study was to determinethe "safe yield" that ResourceAuthority (MWRA)entitled, "Water the water supply system can deliver until Supply Study and Environmental Impact the year 2020.The choice of water sources Report," describes an enormous project to augmentthe existingwater supply system which, if and when completed, will identify depends primarily on the knowledge of the the preferred alternative(s) for meeting the "safe yield" of both the existing system and projected water supply needs of the areas the sourcesunder consideration,in addition . serviced by the MDC and MWRA until the to the forecasteddemand for water. Figure I year 2020.1In 1969,the demandfor water 1 comparesthe system"safe yield" to the from the MDC/MWRA water supply system, demand for water over the past two , which services greater Boston and its centuriesand illustratesthe increasingshort- neighboring communities,first exceeded300 fall of water that may be anticipated in the million gallons per day (mgd) - a value future, if the existing water supply system CIVIL ENGINEERING PRAcnCE SPRING 191111 7 ~ ;~ - r:~- ~~'- I " 1: 0 -- -"- . I . ! I 400 1 : / // Projected -/ ~ ' ,, l 300 1940 Quabbin Reservoir ' .' - . -a ~ ..§. , -a ! c i E 200 ,t ~ 1931Ware River Diversion , "'- ~ 1908 Wachusett Reservoir I .- >- I, QI ,., -~ V1 100 1872-1898 Sudbury 1848 lake CochituateRiver Reservoirs 1795 Jamaic~ Pond 0 1800 1850 1900 1950 2000 - ~ Year ~;, ."~. ~:::-' FIGURE1. A chronologichistory of Boston'swater supply system. is not augmented by additional sources of 1960s. water. It is evident from Figure 1 that the Estimating the "safe yield" of the long-rangeplanning problem of determining MDC/MWRA system using classicalsimula- the optimal plan for augmentingthe existing tion proceduresknown in practice as Rippl's water supply system depends significantly mass curve,s or its automated equivalent on the value of the existing system yield sequent peak algorithm,6 is not new. that can be considered"safe." Historically, whenever an addition to the Classical procedures for determining the supply system was contemplated, classical "safe yield" of a water supply systemconsist "safe yield" procedures were employed to of simulating the entire water supply system determinethe storage-yieldrelationship. The and routing the historical streamflows estimated "safe yields" of the historic water through the system to determine the supply systems are shown in their chron- maximum yield that could be sustained ologic sequencein Figure 1. Brutschpresents classicalwithout emptying"safe yield" the estimatereservoir(s). for Thethe supplya comprehensive system fromhistory 1630to of today.7 Boston's water. MDC/MWRA system is simply a single Interestingly, over 50 years ago when the estimateof the yield that could be sustained Quabbin Reservoir was in its planning by the system during the worst drought on phase,the system"safe yield" was estimated record, in this case the drought during the to be 300 mgd, an amount that was fore- 8 CIVILENGINEERING PRACTICE SrRING 1988 i -"""..,c "'j , !'-- ,--" . , - .." "0'-., - - - - ~--~..- ~ ,; \ castedto satisfy demandsfor 50 years.Those Company, and the Brazilian hydroelectric calculations that were based on 50 years system:O.11.12.13.14The MDC/MWRA, along with fewer streamflow measurementsthan avail- many other agenciesacross the nation, have able today were remarkably accurate. been hesitant to employ stochastic stream- Furthermore, the original "safe yield" calcu- flow models that are often complex,difficult lations were made without knowledge 6f and expensiveto implement,and really only . .ne severe drought that occulTed in the provide one additional dimension to the 1960s. "Safe yield" determinations were problem: a comprehensive description of probably viewed less critically in the past, system reliability. Yet, if adequatemanage- '. because the demand was seen as an ever ment of this large and complexwater supply increasing amount and each new reservoir system until the year 2020is a priority, the added to the systemwas only another incre- system must be examinedwith regard to its mental step in the supply curve. Perceived vulnerability to droughts of different char- changesin system reliability simply moved acter, because it is unlikely that another the planning horizon forward or backward drought will mimic the drought experienced a few years. In the 1980s,environmental, during the mid-1960s. economicand political factors have imposed This study provides a description of the severe constraints that make it much more development of the system storage-yield difficult for engineersto implement the con- relationship using the historical streamflows servative designs that herald their profes- as input to a monthly simulation model of sion. the water supply system, and provides an The current state-of-the-artof "safe yield" examination of the system storage-reliabil" analysis uses stochastic streamflow models ity-yield relationship using a stochastic to generatealternative, yet likely, streamflow streamflow model. Given our limited know- sequencesand to route those streamflows ledge of the character of future droughts through the water supply system using the the systemcould experience,the likely range sequent peak algorithm. The result is a of values of the "safe yield" of the storage"reliability-yield relationship instead MDC/MWRA water supply system are of the classical storage-yield relationship estimated using a stochastic streamflow produced by simply routing the historical model. In short, this study addressesthe streamflows through the water supply questionof how safethe system"safe yield" system. Routing synthetic streamflow really is and provides a measure of how sequencesthrough the water supply system vulnerable the MDC/MWRA system is to permits the evaluation of how vulnerable future droughts - information that is essen- the system is to droughts with different tial to the long-range planning of surface characterthan, for example,the single severe water supplies in Massachusetts. drought experiencedduring the mid-1960s. .. The application of stochastic streamflow Monthly SImulatIon Model models to water supply problems was intro- Classificationof ReservoirSystems and Design duced by Fiering in the U.S. in 1963.8A Proceduresfor Water Supply Problems.Two review of stochastic streamflow models is general classes of water supply systems provided by Matalas.9Stochastic streamflow exist: short-term and long-term reservoir models are no longer limited to research systems. Short-term reservoir systems applications; their use in practice is increas- operate on an annual or seasonalbasis and ing. Recentapplications of stochasticstream- are characterizedby systemswith reservoirs flow models to determining the reliability of that refill at the end of each seasonor year. existing reservoir systems include, but are Long-term reservoirs do not typically refill not limited to, studies sponsored by the at the end of each year; such systems are following agencies: State of California, particularly prone to water supply failures BonnevillePower Administration, the Bureau (empty reservoirs)during periods of drought of Reclamation, Pacific Gas and Electric that extend over several years.The existing CIVIL ENGINEERING PRAcnCE - SPRING 1988 9 ",:c;J ,£; ~ - - -0 --- ~:,!:,-.!:!-a_~~~=_--~Massachusetts -- 0 . ~0.. ~ u.. .. CII ..C ~ I- Boston - - - - -- - - - --> ~ a N .8 C:) CII c o. Reservoirs t U - - - - - - Indicatestunnel or aqueduct . '" \ Q Q uabbln ;!";_iJ W Wachusett . I - ~a~~~~:e!:!: S Sudbury -- I Connecticut F Framingham ; .,.,.~ :';. ,i FIGURE2. Major. components- of MDC!MWRA water supply- - system. i MDC/MWRA system consists of long-term systems.According to Linsley et al.;ls reservoirs that have a total active storage capacity of approximately265 billion gallons The traditional estimateof yield has been or 2.4 years of carry-over storage for a con- based on a critical period, usually the tinuous demand of 300 mgd. The MDCI driest period in the historical record. No MWRA reservoirs are rarely full and the meaningful estimateof probability can be traditional "safe yield" analysis that routes made for such a critical period.
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