Flood Report, Figures, And Tables

Figure 1. Map of the H.J.Andrews Experimental Forest showing locations of experimental watersheds and weather stations.

Figures 2 and 3. Daily precipitation and average air temperatures during the period of Jan. 13 - Feb. 13, 1996 at Primary Meteorological Station elev. 1,430 ft. (436 m), and at Upper Lookout Meteorological Station elev. 4,250 ft. (1300 m) in the HJA.

Figures 4 and 5. Flood hydrographs for control (undisturbed) watersheds and for clearcut logged and revegetating watersheds with rainfall and snowmelt at 6-hour intervals for the Hi-15 Station (near WS 8). Streamflow is on an area basis (Cubic feet/second/square mile).

Figure 6. (Smaller version) Summary of daily precipitation and snowmelt data from Upper Lookout, Hi-15, Vanilla Leaf, and Central meterological stations, H.J. Andrews Forest, for February 1-10, 1996. Snowmelt is calculated as the difference between lysimeter outflow and precipitation; negative snowmelt represents snowpack storage of water.

Figures 7 and 8. Comparison of Watershed 1 flood peaks of Feb. 1996 and Dec. 1964. and Watershed 2 flood peaks of Feb. 1996 and Dec. 1964.

Figure 9. Comparative photos of woody debris deposition from debris flows in Watershed 3 during storms of Dec. 1964 and Feb. 1996. Both events destroyed the Watershed 3 gauging station. (Fig 9a: black and white, Fig 9b and Fig 9c: color)

Table 1. Weather conditions during the flood at three HJA weather stations representing low, mid, and high elevations. The Primary Station is at 1,430 ft. (436 m), Hi-15 at 3,025 ft. (922 m), and Upper Lookout Station is at 4,250 ft. (1300 m) elevation. Air temperatures (º C) were taken at a height of 4.5m and soil temperatures at a depth of 10 cm. An estimate of 1.25 inches (32 mm) snowmelt at the Primary Station was made using snow core depth measurements.

Table 2. Characteristics of gauged watersheds on the H.J. Andrews Experimental Forest.

Table 3. Summary of daily precipitation, snow pillow (snow water), and lysimeter (snow melt plus precipitation) from Upper Lookout, Hi-15, Vanilla Leaf, and Central Meteorological Stations, H.J. Andrews Forest, for February 1-10, 1996. Snowmelt is calculated as the difference between lysimeter outflow and precipitation; negative snowmelt represents snowpack storage of water. Total water available is calculated as the sum of previous day's snow water plus current day's precipitation.

Table 4. Comparison of the December 1964 and February 1996 peak streamflows for the HJA gauged watersheds. When instrument malfunctions have occurred, peaks have historically been estimated using past relationships with peak flows from other similar watersheds.

Table 5. Examples of hypothetical species response to flood disturbances. Refugia and life history characteristics that determine resilience to flooding are identified for examples of organisms that we hypothesize will exhibit slow, intermediate, and rapid rates of recovery.