USDA Forest Service
 

Pacific Southwest Research Station

 

Pacific Southwest Research Station
800 Buchanan Street
West Annex Building
Albany, CA 94710-0011

(510) 559-6300

United States Department of Agriculture Forest Service. USDA logo which links to the department's national site. Forest Service logo which links to the agency's national site.

Research Topics Water & Watersheds

About this Research:

Participating Programs

Contributing Scientists and Staff

Related Links

Caspar Creek Experimental Watershed Study

Annual Precipitation, Streamflow, and Sediment:

Column Description
  • Year: Water year August 1 - July 31 (* except for 1963 runoff which began November 11, 1962)
  • Ppt_N (mm): Annual Precipitation at raingage N408 in millimeters.
  • Ppt_S (mm): Annual Precipitation at raingage S620 in millimeters.
  • RO_N (mm): Annual Streamflow (runoff) at North Fork weir in millimeters.
  • RO_S (mm): Annual Streamflow (runoff) at South Fork weir in millimeters.
  • SuspSed_N (mT/km2): Annual Suspended Sediment discharge passing over the North Fork Weir in metric tons per square kilometer.
  • SuspSed_S (mT/km2): Annual Suspended Sediment discharge passing over the South Fork Weir in metric tons per square kilometer.
  • Pond_N (m3/km2): Annual volume of sediment deposited in the debris basin above the North Fork Weir in cubic meters per square kilometer. Negative numbers mean the basin survey yielded less volume than the previous year.
  • Pond_S (m3/km2): Annual volume of sediment deposited in the debris basin above the South Fork Weir in cubic meters per square kilometer. Negative numbers mean the basin survey yielded less volume than the previous year.
Notes
  • Values of weir pond deposition and suspended sediment for 1963 through 1976 are from Rice, Tilley, and Datzman (1979), adjusted here to a watershed area of 473.2 hectares. The original authors used 1225 ac (495.75 ha) and assumed a bulk density of 1185 kg/m3 for converting suspended sediment mass to volume. Suspended sediment was estimated from annual sediment rating curves. Since the rating curves were based primarily on rising limb samples, 1963-1975 suspended loads are very likely overestimated by a factor of 2 to 3 (Lewis, 1998).
  • Suspended sediment for 1978-1998 is based on an average of 142 samples per station per year, mostly collected during high flows. Concentration was interpolated using time, stage, or turbidity during storm periods. Annual sediment rating curves were employed to estimate sediment concentrations between storms and when more than 24 hours separated the samples. These values differ somewhat from previously reported values that were based solely on sediment rating curves. These current values should be considerably more accurate.
  • Weir pond deposition was derived from annual surveys of the pond from the weir up to and including the bedload delta area. Negative values appear for some low transport years and may result from either settling of sediments or measurement errors.
  • * Annual Streamflow (runoff) for 1963 is calculated from November 11, 1962 through July 30, 1963.
Year Ppt_N (mm) Ppt_S (mm) RO_N (mm) RO_S (mm) SuspSed_N (mT/km2) SuspSed_S (mT/km2) Pond_N (m3/km2) Pond_S (m3/km2)
1963   1132 * 531 * 526 37.1 56.3 17 26
1964   857 354 349 34.4 45.6 20 13
1965   1228 721 701 224.5 168.5 212 69
1966   978 494 507 272.7 143.9 256 57
1967   1287 693 684 50.7 72.4 19 32
1968   962 375 410 24.8 191.4 17 39
1969   1434 818 823 142.9 198.0 122 69
1970   1170 698 699 141.9 109.2 70 43
1971   1242 745 718 179.6 208.6 115 124
1972   926 373 383 18.7 69.7 -25 -44
1973   1280 809 899 119.6 662.8 56 70
1974   1694 1305 1372 992.2 836.9 377 103
1975   1200 793 873 144.0 408.6 74 30
1976   762 333 402 19.4 100.1 -11 14
1977   305            
1978 1590 1335 690 889 51.9 133.8 46 74
1979 1111 923 411 488 19.1 52.3 70 69
1980 1354 1252 628 675 41.2 25.5 12 8
1981 948 874 275 365 5.5 15.6 1 13
1982 1734 1518 981 1046 80.7 86.5 34 53
1983 2206 2008 1392 1352 154.4 139.3 97 59
1984 1318 1232 678 694 33.8 28.3 13 22
1985 1036 897 365 446 17.8 43.5 9 20
1986 1203 1205 626 620 37.3 29.3 29 31
1987 945 828 334 389 5.6 12.0 -4 -4
1988 1014 934 356 379 16.0 18.2 9 13
1989 1176 1088 424 474 8.3 12.1 9 13
1990 1136 979 390 380 42.7 44.7 34 36
1991 825 716 175 168 1.6 2.7 -2 -4
1992 929 919 323 271 5.9 5.9 -1 4
1993 1622 1511 827 773 75.8 97.6 79 84
1994 834 841 283 238 6.0 7.5 -4 -2
1995 1608 1559 1024 937 140.5 106.6 117 73
1996 1318 1252 768 675 42.6 35.6 17 27
1997 1306 1292 783 675 114.3 115.4 55 60
1998 2234 2202 1514 1409 125.9 203.4 56 152
1999 1345 1376 877 831 78.7 190.3 52 129
2000 1176 1167 621 560 15.8 27.6 7 17
2001 870 812 269 238 5.0 9.5 3 12
2002 1206 1162 658 603 22.6 40.1 13 35
2003 1531 1499 996 809 36.6 57.6 16 53
2004 1117 1100 611 556 18.1 31.4 12 47
2005 1366 1223 562 482 5.3 12.5 7 9
2006 1666 1692 1258 1174 377.1 191.2 179 153

Updated on May 21, 2007

Research contact:

Last Modified: Mar 7, 2012 06:03:22 PM