RT08C - Laraos manantial (spring)
Site Code: RT08C. GPS: S12°36286, W75°763187. Elevation: 3734m asl.
Water Quality Data
The following river and water quality data was collected from this site:
| T8c | November 2019 (old site) | November 2021 (new site) |
|---|---|---|
| Season: | Austral Summer | Austral Summer |
| Date: | 21.11.2019 | 16.11.21 |
| Time: | 9.30am | 13.45pm |
| Width (m) | 11 | 0.11 |
| Depth (Av.) (m) | 0.06 | 0.09 |
| CSA (Av.) (m²) | 0.67 | 0.01 |
| Velocity (Av.) (m/s) | 0.30 | 0.03 |
| Discharge (Av.) (m³/s) | 0.200 | 0.000 |
| Riverbed sediment | Gravel & Cobbles | Pebbles, Cobbles & Boulders |
| Temp. (Atmospheric) (°C) | 18.5 | 23 |
| Temp. (Water) (°C) | 10.34 | 16.99 |
| Atmospheric pressure (mbar) | 700 | |
| Dissolved oxygen (mg/l) | 2.95 | 6.60 |
| Dissolved oxygen (%) | 45.0 | 105.3 |
| pH | 7.94 | 8.39 |
| Conductivity (µS/cm) | 287 | 409 |
| Total Dissolved Solids (ppm) | 143 | 204 |
| ORP (mV) | 154.4 | 149.5 |
| Turbidity | Clear: | Clear: |
| Alkalinity (mg/l CaCO₃) | - | 120 (1.6N) |
| Alkalinity Field Tester (ppm/ CaCO₃) | - | - |
Data Analysis
Discharge consists of measurements taken from the three main channels flowing from the spring (mantanial).
At well over 3500m asl the DO readings at T8c fall within the range to be expected. The measurements for DO, conductivity and total solids are also as expected. It is likely that the source of the main spring is augmented by a series of groundwater springs throughout the valley and therefore, the difference is only slight. The karst scenery in this area is known for its caves - the deepest, high altitude cave system in the world is located a short distance upstream of the site.
Site Description
(Please refer to Site T08B).
Site T08C - the mantanial study site (Nov.2019) & new study site above the mantanial - channel to the left in the photo (Nov.2021). (John Forrest)