FORGE POND DAMFish Passage Improvement

Feasibility Study and Preliminary DesignJones River, Kingston, MA

November 14, 2012

Presented By Jill Winton

BACKGROUND

JONES RIVER BASIN

PROJECT GOALS

• Document existing flow conditions and water supply management

• Conduct new analyses to forecast the feasibility of providing fish passage at Forge Pond Dam under different scenarios of flow management and structural modifications

FORGE POND

SILVER LAKE NATURAL OUTLET

FORGE POND DAM

Spillway

Walkway atop

3 stoplog bays

Access road atop

3 culvert openings

Forge Pond

FORGE POND DAM

38 ft El. 47.6 ftEl. 47.9 ft

El. 46.1 ft

El. 43.9 ft

El. 49.3 ftEach 4.3 ft

3.4 ft 6.3 ft5.8 ft 5.8 ft

Lake St culvert(4.5-ft diameter)

SpillwayWalkway atop 3 stoplog bays

Acce

ss ro

ad a

top

3 cu

lver

t ope

ning

s

Note: Not to scale.

LAKE STREET CULVERT & ACCESS ROAD

FISHERY RESOURCES

TARGET SPECIES – River Herring

Blueback herringAlosa aestivalis

AlewifeAlosa pseudoharengus

OTHER SPECIES

American eelAnguilla rostrata

Under review as a threatened species under ESA

Tidewater mucketLeptodea ochracea

Eastern pondmussel Lagumia nasuta

FRESHWATER MUSSELS

Species of Special Concern in MA

HABITAT REQUIREMENTS

Parameter Units Sample Size Acceptable Criteria Exceedence Classification

Temperature (nursery) °C 53 ≤ 28.3 2% Suitable

Temperature (spawning) °C 37 ≤ 26.0 0% Suitable

Dissolved oxygen mg/L 75 ≥ 5.0 11% Impaired

pH SU 90 6.5 to ≤ 8.3 38% Impaired

Secchi disk depth m 23 ≥ 2.0 0% Suitable

Total Nitrogen mg/L 7 ≤ 0.32 71% Impaired

Total Phosphorous μg/L 7 ≤ 8.0 29% Impaired

Eutrophication N/A 12 BPJ 0% -

Fish Passage N/A 12 BPJ 100% Impaired

Stream Flow N/A 12 BPJ 83% Impaired

Preliminary Summary of River Herring Habitat Assessment at Silver Lake (2008-09)

PASSAGE REQUIREMENTS –Depth

Targets for herring:

ADULTS•8-12 inches•MIN 6 inches

JUVENILES•4-8 inches•MIN 2 inches

PASSAGE REQUIREMENTS –Velocity

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

16 33 49 66 82 98

Perc

enta

ge A

scen

ding

Distance (ft)

1.6 ft/sec3.3 ft/sec4.9 ft/sec6.6 ft/sec8.2 ft/sec9.8 ft/sec11.5 ft/sec

Passage Success Rates for Alewife under Varying Velocities and Distances

PASSAGE REQUIREMENTS –Flow Timing

MAR APR MAY JUN JUL AUG SEP OCT NOV DEC

adults upstreammigration

juveniles downstreamemigration

elvers upstreammigration

silver eels downstreamemigration

Species Life Stage EventMonth

River herring

American eel

Timing of Important Life Cycle Events for Target Species

WATER SUPPLY OPERATIONS

SILVER LAKE WATER SUPPLY SYSTEMSummary of Brockton Water Supply Sources

*Increases annually up to 4.07 mgd. Not included in totals.**110 of systemwide safe yield via a 1995 DEP ACO.

SourceRegistered

or Permitted Withdrawal (mgd)

Required Downstream

Release

Silver LakeNONE

to Jones River

Monponsett Pond0.9 mgd

to Stump Brookwhen diversion is on

Furnace Pond0.3 mgd

to Herring Brookwhen diversion is on

Brockton Reservoir 0.83 NONE

Aquaria desalinization plant up to 4.07* N/A

Hubbard Avenue Well 0.04 N/A

TOTAL 11.98

Administrative ConsentOrder Limit** 11.3

11.11

SILVER LAKE LEVEL – Average

43.0

43.5

44.0

44.5

45.0

45.5

46.0

46.5

47.0

47.5

48.0

1-Jan 1-Feb 1-Mar 1-Apr 1-May 1-Jun 1-Jul 1-Aug 1-Sep 1-Oct 1-Nov 1-Dec

Silv

er La

ke E

lev.

(ft, N

GVD

29)

Silver Lake Elev. (ft, NGVD 29)Forge Pond Dam Spillway Elev. (47.6 ft, NGVD 29)Silver Lake Berm Elev. (45.9 ft, NGVD 29)

When Silver Lake elevation drops below the natural outlet, it has been observed that water flows from Forge Pond intoSilver Lake resulting from groundwater flow into Forge Pond.

When the Forge Pond waterlevel exceeds the spillway crest, water is passed to Jones River.

Spawning adults immigrating

Juveniles rearing

Juveniles emigrating

Period of Record: 1996 - 2012

SILVER LAKE LEVEL – 2011 with Diversions

0

10

20

30

40

50

60

70

80

90

40

41

42

43

44

45

46

47

48

49

1-Jan 1-Feb 1-Mar 1-Apr 1-May 1-Jun 1-Jul 1-Aug 1-Sep 1-Oct 1-Nov 1-Dec

Dive

rsio

ns t

o Si

lver

Lak

e (M

GD)

Silv

er L

ake

Elev

. (ft

, NGV

D 29

)

2011

Silver Lake Elev. (ft, NGVD 29)Forge Pond Dam Spillway Elev. (47.6 ft, NGVD 29)Silver Lake Outlet Elev. (approx. 46 ft, NGVD 29)Diversions from Monponsett Pond (MGD)Diversions from Furnace Pond (MGD)

Spawning adults immigrating

Juveniles rearing

Juveniles emigrating

SILVER LAKE LEVEL – Duration Curves

40

41

42

43

44

45

46

47

48

49

0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%

Silv

er L

ake

Elev

. (ft

, NGV

D 29

)

Percent of Time Silver Lake Elevation is Equaled or Exceeded

April Silver Lake ElevationMay Silver Lake ElevationJune Silver Lake ElevationForge Pond Dam Spillway Elev. (47.6 ft, NGVD 29)Silver Lake Berm Elev. (45.9 ft, NGVD 29)

Period of Record: 1996 - 2012

40

41

42

43

44

45

46

47

48

49

0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%

Silv

er L

ake

Elev

. (ft

, NGV

D 29

)

Percent of Time Silver Lake Elevation is Equaled or Exceeded

July Silver Lake ElevationAugust Silver Lake ElevationSeptember Silver Lake ElevationForge Pond Dam Spillway Elev. (47.6 ft, NGVD 29)Silver Lake Berm Elev. (45.9 ft, NGVD 29)

Period of Record: 1996 - 2012

Spring Immigration

Fall Emigration

AQUARIA PLANT – Cost Analysis

$-

$5

$10

$15

$20

$25

$30

$35

$40

$45

$50

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5

Ove

rall

Annu

al C

ost

(dol

lars

per

thou

sand

gal

lons

)

Amount of water Purchased from Aquaria (million gallons per day)

Brockton (2009) reported average 0.35 MG = $47/1000 gal

2012 Firm Commitment 3.5 MG = $5.82/1000 gal

Chart maximum0.1 MG = $162/1000 gal

Overall Cost of Aquaria Water per Amount Purchased by Brockton (2012 example)

Fixed Rate = $167,480 per 0.1 mgd (total annual cost of $5,861,800 for 2012 for 3.5 MGD)

Variable Rate = $1.23 per 1,000 gallons used

Excess Rate = $0.60 per 1,000 gallons used

FISH PASSAGE ALATERNATIVES

FISH LADDER – Alaska Steeppass

FISH LADDER – Plan View

FISH LADDER – Detail View

NATURE-LIKE BYPASS CHANNEL

NATURE-LIKE BYPASS CHANNEL

42

44

46

48

50

52

0 50 100 150 200 250 300

Elev

ation

(ft)

Distance (ft)

Upstreaminvert = 46.2' (Silver Lake

outlet invert )

Bypass channel finshed grade (slope = 1.3%)

Downstream invert = 42.4'

(channel invert U/S of Lake St)

Approximate access road location

Existing ground topography

(to be graded)

Elevation Profile of Potential Bypass Channel

DAM REMOVAL

CONSIDERATIONS• Water Supply• Sediment• Infrastructure• Wetlands• Historical

Resources• etc.

Former Wapping Road Dam

DAM REMOVAL – Modeling Approach

5000 5500 6000

40

42

44

46

48

50

Main Channel Distance (ft)

Ele

vatio

n (ft

)

Legend

WS 21.3 cfs

WS 3.15 cfs

WS 0.016 cfs

Ground

LAK

E S

T

AC

CE

SS

RD

NA

TUR

AL

OU

TLE

T

Jones River Upper

NEXT STEPS

• Required flows for each alternative• Feasibility of flow availability• Budgetary cost estimates• Selection of preferred alternative• Conceptual designs

LATER PHASES• Detailed designs• Permitting• Implementation• Monitoring

QUESTIONS?