Embayment Nitrogen Loads Jamie Vaudrey, UConn September 17, 2015 – LISS STAC & CAC

Collaborators Charlie Yarish, UConn (2011, 2013) Chris Pickerell, CCE (2011, 2013) Lorne Brousseau, CCE (2013) Justin Eddings, CCE (2013) Jang Kim, UConn (2013)

Field and Lab Support Claudia Koerting, Roni Ortiz, Nick Krupski, Barry Udelson, Stephen Schott Josh Carter, Joel Corso, Melissa Cote, Adam Chlus, Jenny Dootz, Amanda Dostie, Kim Gallagher, Rafeed Hussain, Christopher Kunz, Leigha Krize, Corey Leamy, Marissa Mackewicz, Kelsey Olguin, Rachel Perry, Michelle Slater, Carolyn Sukowski

SUPPORT no official endorsement should be inferred Use N-load to predict problem areas & identify sources of impairment. • nutrient load to 110 embayments • eutrophic status in 15 embayments • use N-load (+) to predict eutrophic status – the “+” includes freshwater flushing time and hypsography

= field site #1 #48

#110 #95 colored areas = watershed embayments other areas draining to LIS (not shaded) COLORS are different land cover categories.

Estimate N Load from:  land type  population  houses  sewer districts  WWTF reported inputs

note – watershed boundary is correct, other lines are approximations for this presentation , Eastern CT TOTAL LOAD (includes Atm Dep to embayment surface)

8.0e+7 80 million kg / y = 176 million lb / y East River

6.0e+7

4.0e+7 NLoad y) (kgN / 2.0e+7

New Haven Harbor PawcatuckThames River River MamaroneckManhasset River Bay 0.0 NorwalkStamford Harbor Harbor 0 10 20 30 40 50 60 70 80 90 100 110 site ID, moving E>W to NYC, then W>E 140,000 kg / y = 308,647 lb / y TOTAL LOAD

1.4e+5

1.2e+5

1.0e+5

8.0e+4

6.0e+4 NLoad y) (kgN / 4.0e+4

2.0e+4

0.0 0 10 20 30 40 50 60 70 80 90 100 110 site ID, moving E>W to NYC, then W>E tidal restriction? no inner 25% midway at mouth multiple TOTAL LOAD, NORMALIZED TO EMBAYMENT SIZE

30000

25000 Mamaroneck River / y) 20000 East River estuary Calf PenPequonnock Meadow Creek River 15000 Byram R. Black Rock Harbor Oyster River, CT 10000 Fence Creek

NLoad ha (kgN / 5000 Stamford Harbor Manhasset Bay 0

0 10 20 30 40 50 60 70 80 90 100 110 site ID, moving E>W to NYC, then W>E TOTAL LOAD (includes Atm Dep to embayment surface)

1,200,000

1,000,000 Sewer

800,000 Septic

600,000 Fertilizer 400,000 N Load (kg / y) Atm Dep 200,000 Atm Dep to - Embayment , Mamaroneck CT River, NY Proportion of Nitrogen Source

Niantic River, CT Mamaroneck River, NY

Atm Dep to septic Embayment Atm Dep (to embayment) rain & dust Fertilizer fertilizer (to land) sewer Septic Sewer Remove sewer: fertilizer is main source. (for this watershed) Mamaroneck River, NY

Atm Dep to Embayment Atm Dep

Fertilizer

Septic FERTILIZER CONTRIBUTION

OutBUFF200 FAR OutBUFF200 NEAR BUFF200 NEAR

OutBUFF200 NEAR OutBUFF200 FAR

BUFF200 NEAR

note – watershed boundary is correct, other lines are approximations for this presentation Questions?

Our research group is available to meet with you for longer discussions.

Contact Jamie Vaudrey [email protected] University of