CSO SIMULATION SCENARIOS

Map of CSO Locations in Port Washington Narrows

			Overflow Conditions			Simulation Results (Notes)
			Overflow Conditions			Overflow = 10⁶ cfu/100 ml Exceed ³ 14 cfu/100 ml			Overflow=10⁶ cfu/100 ml Exceed ³ 140 cfu/100 ml
#	Event	Storm	Outfall	Volume (Gal)	Duration (hr)	Time Series	Animation	Domain Exceeded	Animation	Domain Exceeded
Combined Sewer Overflow						Map
1	Current system 80% complete	Mar ‘97	OF-11	227,000	24	Surface Average Max	Surface Average	Surface	Surface Average	Surface
2	Current system 80% complete	Mar ‘97	OF-11	227,000	6	Surface Average Max	Surface Average	Surface	Surface Average	Surface
3	Current system 80% complete	Nov ‘98	OF-11	429,900	24	Surface Average Max	Surface Average	Surface	Surface Average	Surface
4	Current system 80% Complete	Nov ‘98	OF-11	429,900	6	Surface Average Max	Surface Average	Surface	Surface Average	Surface

Discharge from Eastside Treatment Facility						Overflow = 10⁵ cfu/100 ml Exceed ³ 14 cfu/100 ml
#	Event	Storm	Outfall	Volume (Gal)	Duration (hr)	Time Series	Animation	Domain Exceeded
5	Failure of UV disinfection system		OF-2	10,000,000 (7,000gal/min)	24	Surface Average Max	Surface Average	Surface
6	Failure of UV disinfection system		OF-2	2,520,000 (7,000gal/min)	6	Surface Average Max	Surface Average	Surface

Future Conditions These simulations assume CSO improvements are completed.						Overflow = 10⁶ cfu/100 ml Exceed ³ 14 cfu/100 ml
#	Event	Storm	Outfall	Volume (Gal)	Duration (hr)	Time Series	Animation	Domain Exceeded
7	Future system 100% complete	Mar ‘97	OF-11	No Overflow	6
8	Future system 100% complete	Nov ‘98	OF-11	37,400	6	Surface Average Max	Surface Average	Surface

Sensitivity Analysis These simulations are variations of simulation #3.						Overflow = 10⁶ cfu/100 ml Exceed ³ 14 cfu/100 ml
#	Event	Storm	Outfall	Volume (Gal)	Duration (hr)	Time Series	Animation	Domain Exceeded
9	Wind – Constant wind 10 m/s (22.6 mph) from SW	Nov ‘98	OF-11	429,900	24	Surface Average Max	Surface Average	Surface
10	Turbidity – Decreased secchi depth by 50%	Nov ‘98	OF-11	429,900	24	Surface Average Max	Surface Average	Surface
11	Sunlight – Decreased sunlight intensity by 50%	Nov ‘98	OF-11	429,900	24	Surface Average Max	Surface Average	Surface
12	Fresh water inflow – input Jan/Feb mean flow from 10 major streams	Nov ‘98	OF-11	429,900	24	Surface Average Max	Surface Average	Surface
13	No FC Die Off – simulates conservative substance	Nov ‘98	OF-11	429,900	24	Surface Average Max	Surface Average	Surface

Simulated Spills						Overflow = 10⁶ cfu/100 ml Cmax ³ 100 cfu/100 ml
#	Event		Outfall	Volume (Gal)	Duration (hr)	Time Series	Animation
14	July 2002 Sewer Spill		ST28 & OF-17	280,000	1 week	Results	Surface Average

Summary

· CH3D-FC calibrated and verified for simulating FC transport (Mancini’s Equ) in Sinclair and Dyes Inlets

· Empirical approach used to estimate “typical” CSO volumes

· Nov ’98 and Mar ’97 storms used to simulate overflow conditions

· Fecal coliform persistence controlled by dispersion and decay from sunlight

· FC concentrations predicted by model are based on conservative assumptions

· Simulation of July 2002 spill in Sinclair Inlet agreed with field data (2 samples)

Link to Dye Study Sampling Plan

Link to CSO Modeling Overview Presentation (from ENVVEST Working Group Meeting of July 23, 2003)

Link to Sensitivity Analysis Plots

Simultaneous simulations of sensitivity runs Sensitivity.ppt

Time series plots:

Sinclair Inlet Station Sensitivity_Sinclair_ts.xls

Phinney Bay Station Sensitivity_Phinney_ts.xls

Middle Dyes Inlet Station Sensitivity_Dyes_ts.xls

Erlands Point Station Sensitivity_ErlandsPt_ts.xls

Windy Point Station Sensitivity_WindyPt_ts.xls

Note from PF Wang on August 29, 2003 pf_note_August_29_03.htm

Reference for Model Simulation Results:

Wang, P.F., R.K. Johnston, H. Halkola, R.E. Richter, and B. Davidson, 2005. A Modeling Study of Combined Sewer Overflows in the Port Washington Narrows and Fecal Coliform Transport in Sinclair and Dyes Inlets, Washington. Prepared by Space and Naval Warfare Systems Center, San Diego for Puget Sound Naval Shipyard & Intermediate Maintenance Facility Project ENVVEST, Final Report of June 18, 2005.

Overflow Conditions

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Sensitivity Analysis

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Summary