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 study site. (John Forrest) 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)