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San Francisco Estuary Institute. Item #1a. Exploratory categorization of watersheds for potential stormwater monitoring. Ben Greenfield, Marcus Klatt, Lester McKee Sources Pathways and Loadings Workgroup May 6 th 2010. San Francisco Estuary Institute. Item #1a. Topics.

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exploratory categorization of watersheds for potential stormwater monitoring
San Francisco Estuary Institute

Item #1a

Exploratory categorization of watersheds for potential stormwater monitoring

Ben Greenfield, Marcus Klatt, Lester McKee

Sources Pathways and Loadings Workgroup

May 6th 2010

topics
San Francisco Estuary Institute

Item #1a

Topics
  • Categorization of watersheds
  • Watersheds for long term monitoring
background trend monitoring goals
San Francisco Estuary Institute

Item #1a

Background – Trend Monitoring Goals
  • Which Bay tributaries contribute most to Bay impairment from pollutants of concern (POC)
  • Quantify annual tributary POC loads or concentrations
  • Quantify the decadal-scale POC loading or concentration trends
  • Quantify the projected impacts of management actions (including control measures)
1 categorization of watersheds
San Francisco Estuary Institute

Item #1a

1. Categorization of Watersheds
  • Develop rationale for initially classifying Bay Area small tributary watersheds into a small number (<10) of categories for monitoring
  • Provide STLS stakeholders with a tool to develop and rank a list of representative watersheds in each class
study area
San Francisco Estuary Institute

Item #1a

Study Area
  • 185 watersheds included
  • Focused on areas with best available data
  • Potential for expansion after data development to new areas
approach
San Francisco Estuary Institute

Item #1a

Approach
  • Compile GIS with land use history and other attributes
  • Scaled and transformed data
  • Cluster analysis to determine watershed categories
    • Ward’s minimum variance method with Bray-Curtis dissimilarity
    • Used eight clusters
  • Non-metric Multidimensional Scaling - evaluate key distinguishing features of watersheds
metrics included
1995 Land Use

% Industrial

% Residential

% Commercial

% Agriculture

% Open

1954 % Industrial

% Impervious

Current and historic railroads (RR)

Watershed area

Population/area

PG&E facilities/area

Pump stations/area

Auto dismantlers/area

Annual precipitation avg.

UTM spatial coordinates

San Francisco Estuary Institute

Item #1a

Metrics Included
slide8
Clustering by
  • Size
  • Land use – industrial vs. open
  • Imperviousness
  • Attributes
    • RR
    • PG&E
    • Pump stations
slide12
Watershed variation:
  • Imperviousness
  • Industrial vs. open
  • Railroads
slide13
Cluster 1:
  • Small – highly urbanized
slide14
Cluster 1:
  • Small – highly urbanized
  • Cluster 2:
  • Moderate size
  • Urbanized, PG&E, RR
slide15
Typical small and moderate sized watersheds

Cluster 1

41 watersheds

Cluster 2

43 watersheds

slide16
Cluster 1:
  • Small – highly urbanized
  • Cluster 2:
  • Moderate size
  • Urbanized, PG&E, RR
  • Cluster 6
  • Large with more open space
slide17
Typical large watersheds

Cluster 6

22 watersheds

2 watersheds for long term monitoring
2. Watersheds for long term monitoring
  • Municipal Regional Stormwater NPDES Permit (MRP) lists watersheds for long term monitoring
  • How do they fit together?
    • Representative of urban/industrial source signals
    • Current data/leverage
    • Feasible to monitor
    • Address monitoring questions
mrp monitoring questions
San Francisco Estuary Institute

Item #1a

MRP –Monitoring Questions
  • Which Bay tributaries contribute most to Bay impairment from pollutants of concern (POC)
  • Quantify annual tributary POC loads or concentrations
  • Quantify the decadal-scale POC loading or concentration trends
  • Quantify the projected impacts of management actions (including control measures)
mrp loads monitoring watersheds
San Francisco Estuary Institute

Item #1a

MRP Loads Monitoring Watersheds
  • Guadalupe River Cluster 6
  • Walnut Creek Cluster 7
  • Zone 4 Line A Cluster 1
  • Castro Valley Creek
  • Rheem Creek – Richmond Cluster 1
  • Calabazas Creek –Santa Clara Cluster 1
  • San Mateo Creek Cluster 2
  • Laurel Creek – San Mateo Cluster 1
guadalupe river
Cluster 6 – large watershed

Varied land use

Extensive long term monitoring data

Planned Hg and PCB TMDL management actions

San Francisco Estuary Institute

Item #1a

Guadalupe River
walnut creek
Cluster 7 – large watershed (368 km2)

Mostly open and residential land use

Attributes of Cluster 6

Current/prior monitoring data?

Planned management actions?

San Francisco Estuary Institute

Item #1a

Walnut Creek
zone 4 line a
Cluster 1 – small watershed (8.8 km2)

44% industrial land use

4 yr monitoring data

Few planned management actions

Limited land use change

“Control” watershed

San Francisco Estuary Institute

Item #1a

Zone 4 Line A
castro valley creek
Small watershed (14.2 km2)

Predominantly low density residential (50%) with some open (35%)

USGS long term flow, discharge, and stage monitoring

Copper and TSS monitoring in WY2004

San Francisco Estuary Institute

Item #1a

Castro Valley Creek
discussion
San Francisco Estuary Institute

Item #1a

Discussion
  • What is an appropriate subset of watersheds to focus on for WY 2010 sampling?
  • How appropriate are the watersheds listed in the MRP for initial sampling to meet the MRP objectives?
  • What other factors should be considered in watershed selection?
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