San Francisco Estuary Institute

Small Tributaries Loading StudyZone 4 Line A

Sources Pathways and Sources Pathways and Loadings WorkgroupLoadings Workgroup

May 2008May 2008

Lester McKee1, Alicia Gilbreath1, John Oram1, Michelle Lent1 and Rand

Eads2

1. San Francisco Estuary Institute 2. Rivermetrics

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San Francisco Estuary Institute

• 4.5 km2 area

• 1.7 km upstream of the bay

• Above the tidal influence

• Engineered urban channel

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San Francisco Estuary Institute

• 38% industrial; 33% residential;

26% commercial; 2% open

• 4 km of rail bed

• Large impervious surfaces

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San Francisco Estuary Institute

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San Francisco Estuary Institute

Instrumentation

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San Francisco Estuary Institute

Field Methods

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San Francisco Estuary Institute

Velocity Measurements and Discharge Rating Curve

Max stage: 0.92 m

Max Q: 8.7 cms

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San Francisco Estuary Institute

Nov Dec Jan Feb Mar Apr May

Dis

char

ge (

cms)

0

2

4

6

8

10

Cu

mul

ativ

e R

ainf

all (

mm

)

0

50

100

150

200

250

300

DischargeCumulative Rainfall

21 storm events

cumulative rainfall =

270 mm (10.6 in)

2007 Hydrology at Z4LA

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Reporting progress

• Draft report 2/3 written– Anticipate completion in the next 1 week– Internal review (1 week)

• Email out for WG review in 2-3 weeks.

San Francisco Estuary Institute

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