long range water system planning...2018/10/16 · dpw water treatment team have led a conservative...

DANIEL J. TOOMEY HEARING ROOMOCTOBER 16, 2018

Long Range Water System Planning

Public Works Department –Engineering DivisionPresentation Outline

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Danvers Resources v. Water Management Act (WMA) constraints

Ipswich River Basin (IRB) Sustainable Water Management Initiative (SWMI) a. FY 17 IRB SWMI Grant b. FY 18 IRB SWMI Grant

Water Supply Resiliency Enhancements within Ipswich River Basin

Demand and Drought Preparedness

Questions

DanversDanvers 2006 WMA Ruling2006 WMA Ruling

WTP at Middleton Pond Transfers of Water from Swan Pond

and Emerson Brook Reservoir Treatment Plant Upgrades in 2012 Can produce upwards of 5.6 MGD Meet or exceed typical Max Day AVERAGE DAILY DEMAND 3.2MGD

Groundwater Well #1 Produces .86 MGD Restricted by IRB flow criteria

Well #2 Greensand Filtration Produces .98 MGD Restricted by IRB flow criteria

Condition 1: Annual AVERAGE Withdrawal =3.72 MGD

Condition 6: Firm AVERAGE Yield Withdrawal (Surface Water) = 3.51 MGD Summer

Condition 8: Utilizing our wells based on IRB stream flow (off/ Alternate Day/ Daily)

Condition 9: UAW 10% RGPCD <65 GPD May 1st to September 30th AVERAGE daily

volume = 3.84 MGD or 587.52 MG Water Use Restrictions (Levels 1 -6)

**These conditions pose very difficult administrative, operational and management challenges for Danvers and Middleton during the peak summer demand.

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Public Works Department –Engineering DivisionLong Range Water System Planning

Public Works Department-Engineering Division Long Range Water System Planning

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1.001.251.501.752.002.252.502.753.003.253.503.754.00

2008 2009 2010 2011 2012 2013 2014 2015 2016 2017

Dan

vers/M

iddleton

ADD (M

GD)

Fiscal Year (2008-2017)

AVERAGE ANNUAL DEMAND (ADD) VS. AUTHORIZED WITHDRAWAL

Average Monthly Withdrawal WMA Authorized Withdrawal

Public Works Department-Engineering Division Long Range Water System Planning

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Public Works Department-Engineering Division Sustainable Water Management Initiative

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IRB SWMI Study FY17 & 18– MassDEP grant-funded collaboration: Danvers,

Middleton, Wenham, Hamilton, LCWD & Topsfield

Phase I – compile & evaluate data on IRB water/wastewater/stormwater usage

and practices; identify potential solutions

Phase II - Quantitatively evaluate in-basin and out of basin (MWRA import)

long term water supply alternatives Develop a basin-wide comparative decision model to evaluate

benefit, impact and feasibility of management strategies


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Phase I Study Key Findings• Municipal groundwater domestic water use is only 1% of Basin

water budget • Most water Suppliers in IRB are using water efficiently• IRB water withdrawals steady since 1980s while groundwater

usage dropped to below 1960s levels • Natural processes like evapotranspiration play a significant

role in Basin hydrology and likely will increase • Non-groundwater solutions (out of Basin supply or in-Basin

surface water) need to be explored to allow for future growth• Regional sharing of resources could help balance human and

environmental needs


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Phase II Study Key Findings• Climate change and growth will likely reduce Basin supply

reliability (on the order of up to 9%).• Conservation is important and has already improved supply

reliability but on its own will not solve the problem long term.• The IRB as a whole has enough water but there are localized

shortages. Regional water sharing, although challenging, could help alleviate local shortages.

• Additional storage or water importation (such as MWRA) are also potential solutions

• Danvers: Importing ~10% of water needs would provide drought resiliency

• Currently not much momentum for regional collaboration


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Phase IIA (Subtask)-Alternatives to providing more drought resiliency

o Utilizing our Wells to maximum capacityo Increasing storage capacity at Middleton Pondo Increasing storage capacity at Emerson Brooko New Well Source Explorationo Connecting to MWRAo Purchasing Water from Salem -Beverly

Can the Town achieve a full resiliency based on historically drought data and a combination of enhanced resources?


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Key Findings based on the Phase IIA Study

New source options are limited to outside the IRB( i.e. North Coastal Basin)

Only by Maximizing Well Use and Capacity of the Dams can supply enough volume to the current population demand based on historical draught data

Any demand increase over 15% will offset any gains made from increasing capacity(Projected out to 2035)

Drought Management and Operation plans will be an effective tool for communities to offset the challenges brought on by climate changes and WMA permit restrictions.


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Drought Management Plan(DMP)

Existing DMP based on historical rainfall previous to 2000 and doesn’t include the Towns 2006 Restrictions.

DPW Water Treatment team have led a conservative and mindful approach to tracking rainfall amount, designating drought stages and implementing the right water restrictions based on the 2006 WMA permit.

WMA Grant(BWR 2019-01) opportunity to update our DMP with 18 years of new rainfall data.

Based on new data, operational trigger points can be defined specifically to help balance water supply sources with our current or future WMA permit.


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Next Steps Apply for WMA Grant(Danvers Only) to Fund:

Updated Drought Management Plan. Minimization Plan

o Will be required for new WMA permitso Summarize all of Danvers efforts to reduce impacts in IRB.o Summarize and compare Danvers source optionso Feasibility of alternatives to existing sources


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QUESTIONS

SWMI Grant Findings and Presentation Materials can be viewed at https://www.danversma.gov/departments/engineering-division/or by contacting :

Civil EngineeringStephen King- Town Engineer1 Burroughs StreetDanvers, Ma [email protected]: 978-777-2668

long range water system planning...2018/10/16 · dpw water treatment team have led a conservative...

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