Mik LewickiSan Francisco Estuary Institute

SPLWG December 12, 2007

Watershed Specific SuspendedSediment Loads Modeling

Introduction • Suspended sediment loads are influenced by climate, geology and

tectonics, soils, basin size and slope, land use and management.

Suspended Sediment Loads Vs. Discharge

 

Alameda Ck. At Niles

Arroyo De La Laguna

Near Pleasanton

Alamewda Ck. Below Welch Ck. Near Sunol

Arroyo Valle Near

Livermore

Arroyo Valle Below Lang Canyon Near

Livermore

Cull Ck. Above Cull

Ck. Reservoir Near Castro

Valley

Cull Ck. Below Cull Creek Dam Near Castro

Valley

San Lorenzo Ck. Above Don Castro Reservoir

Near Castro Valley

Water Year

11179000 11177000 11173575 11176500 11176400 11180960 11180965 11180825

1960 14,674              1961 9              1962 36,784              1963 163,405     52,293        1964 6,431             1965 99,569     15,592        1966 5,745     485        1967 260,780     133,938        1968 8,344              1969 146,757              1970 79,417              1971 24,999              1972 2,766              1973 209,652              1974         8,037      1975         10,752      1976         6      1977         2      1978        65356?      1979         2,641 8,475 337  1980           43,038   1981           1,282  5481982           93,217  66,8281983           87,180  80,4691984           19,508  10,7141985           4,186  3,0341986           48,908  47,2431987           2,359  3,2261988           98  1,0401989           280  4531990               1991               1992           1,328  4,8521993               1994               5891995           15,826   1996           12,560   

1997           35,701   

1998           45,291  151,514

1999           7,081  21,328

2000 35,412 43,355 13,887     8,116   27,032

2001 5,462 7,145 109     132   279

2002 8,099 16,764 1,441     1,496   3,738

2003 394,341 207,295 8,230     10,216   79,756

2004 89,675              

2005 41,933              

2006 150,401              

                 

ResultsInformation from these studies will be combined with information from other studies mainly through mass budgets to provide a more complete picture of temporal trends and spatial patterns in contaminant loads in the Bay

  We hope to learn where it might be the most appropriate to apply limited resources to achieve mass loading target, loads avoided target, or a sediment concentration target.