Introduction

Beginning in late 1981, a monitoring program was begun on a landslide near Weeks Creek in the Santa Cruz Mountains of central California (U.S. Geological Survey La Honda 7.5-minute' quadrangle). Datasets of daily rainfall and groundwater levels at irregular time intervals are included as data files in this report for the 1981-82, 1982-83, and 1983-84 seasons (July 1 through June 30). Rainfall was generally measured only during the several months of moderate to heavy storms in northern California; i.e. from about November through May, and the datasets are therefore not complete for each season. The gages employed continuously recorded rainfall with a resolution of 0.01 inch distinguishable within about 10-minute intervals, but the data listed in this dataset show only daily totals from midnight to midnight. Rainfall was measured at two locations -- at the Weeks Creek landslide and at Harrington Creek, about 2 miles west of the Weeks Creek landslide. The rain gage at Weeks Creek operated inconsistently; consequently, there are many gaps in the Weeks Creek rainfall data that are indicated by n/a (not available) in the dataset. No rainfall was measured at Weeks Creek during the 1983-84 season. For the same storms, the data from the nearby rain gage at Harrington Creek compare well with the data collected at Weeks Creek, and therefore the better complete continuous rainfall record obtained at Harrington Creek serves as an excellent complementary database. Four Casagrande porous stone piezometers installed at specific depths (P1 at 12.5 ft, P2 at 24 ft, P3 at 42 ft, and P4 at 10 ft) and one aluminum inclinometer pipe (I1) perforated at its base of 38 ft were installed for monitoring groundwater levels at different depths within the Weeks Creek landslide. The readings of the depth to the groundwater levels from the ground surface to the nearest 0.5 inch were made during individual site visits at irregular daily time intervals as listed in the dataset. On a few rare occasions, the groundwater levels exceeded the ground surface, and these values are listed with a minus sign (-) before the data value. Three data sets are included on separate sheets in the Excel worksheet file: 1) Groundwater and piezometric levels on Weeks Creek landslide, 2) Daily rainfall on Weeks Creek landslide, and 3) Daily rainfall at Harrington Creek. Locations of the monitoring instruments are given in UTM and Lat/Long coordinates within the datasets.