Rainfall

Rainfall is measured at the monitoring site using two 8-inch-diameter tipping-bucket rain gauges that measure 0.254 millimeters of rainfall per tip.

Rainfall over the last 14 days at Channel Station

Graph of rainfall for last 14 days

Rainfall over the last 14 days at the Central Datalogger

Graph of rainfall for last 14 days

Channel Stage

A laser (distance sensing instrument) is cable-mounted over the channel to measure flow height. A pressure transducer is flush mounted in the channel beneath the laser.

Channel stage, last 14 days

Graph of rainfall for last 14 days

Ground Water Pressure

There are three soil pits located at the site: SP4, SP5, and SP6. Each soil pit area has either a tensiometer or a pressure transducer. The tensiometers can measure pore-water pressures in the range of -85 kPa to 100 kPa, whereas the pressure sensor can measure positive pore-water pressures in the range of 0 to 21 kPa. The location and depth of the instruments are indicated on the graph.

Ground Water Pressure - Tensiometers

Soil suction/pore pressure, last 14 days

Graph of last 14 days

Ground-water and Atmospheric Pressure - Piezometers

The monitoring site is equipped with four piezometers. Three were installed in boreholes at various depths below the ground surface, one at each of the monitoring arrays along the axis of the catchment (SP2, SP1, SP5). The fourth was placed in an enclosure near array SP1 to measure changes in atmospheric pressure. Pore-water pressures are reported in hectoPascals (hPa). One hectoPascal is roughly equivalent to the pressure exerted by a 1-cm-deep column of water.

Pore pressure, last 14 days

Graph of pore pressure for past week

Soil Temperature

Each tensiometer/pressure transducer has a built-in temperature sensor. The locations and depths of the instruments are indicated on the graph.

Soil temperatures over the last 14 days

Graph of
  		soil temperature for past 14 days

Soil Water Content

Each instrument array (SP4-SP6) is equipped with three dielectric instruments to indirectly measure the volumetric water content of the soil. The location and depth of the instruments are indicated on the graphs.

Soil Water Content, last 14 days

Graph of
  		water content for past 14 days

Ground Vibrations

A geophone is installed on the ridgeline near the central datalogger. This installation is experimental in nature, to determine if vibrations from debris-flows can be detected at distance. Although the geophone is sampled at a high frequency, a decimated version of the signal will be posted on the website. A reduced version of the signal is posted below.

Ground velocity, last 14 days

Graph of rainfall for last 14 days

Battery Voltage and Station Temperatures

Battery voltage is monitored for identifying problems with the power system due to solar panel or battery failures.

Battery voltage and temperature, last 14 days

Graph of battery voltage for past 14 days