RT02B - Upper Lincha

Site Code: RT02B. GPS: S12°798367, W75°664697. Elevation: 3500m asl.

Water Quality Data

The following river and water quality data was collected from this site:

RT02B March 2022
Season: Austral Summer
Date: 26.3.22
Time: 11.45
Width (m) 16
Depth (Av.) (m)  
CSA (Av.) (m²)  
Velocity (Av.) (m/s)  
Discharge (Av.) (m³/s)  
Riverbed sediment Pebbles & cobbles
Temp. (Atmospheric) (°C) 11
Temp. (Water) (°C) 10.35
Atmospheric pressure (mbar) 682
Dissolved oxygen (mg/l) 4.56
Dissolved oxygen (%) 68.48
pH 8.61
Conductivity (µS/cm) 262
Total Dissolved Solids (ppm) 131
ORP (mV) 84.8
Turbidity Turbid: green/grey
Alkalinity (mg/l CaCO₃) 122 (1.6N)
Alkalinity Field Tester (ppm CaCO₃) 106

Data analysis

Discharge at this point on the Rio Lincha suggested that there had been recent rains in the headwaters of this large sub-catchment.

At 3500m asl the average DO reading (4.5 mg/l) at T2B was lower than at many sites but falls within the range to be expected.

The conductivity readings (262 µS/cm) were as expected for a high altitude site located above all settlements within a sub-catchment. It suggests good conditions for aquatic life.

The pH reading of 8.61 is good and suggests that the alkalinity of the river is suitable for aquatic life and indicative of clean water.

Site description

Site T2B lies at 3500m asl, just above the settlement of Lincha. The valley at this point is narrow with a v-shaped profile, with a small waterfall just upstream from the site and almost no flood-plain.

Channel bed load comprises of scattered large boulders, and stones. River flow in the Rio Lincha is year-round and delivers some significant input to the Rio Cañete.

The land surrounding the study site is largely agricultural with small fields and pasture animals often grazed there, while eucalyptus and tall natural scrub dominate less accessible areas.

Much higher upstream it is believed that water enters via a tributary channel from an underground spring but any significant mineral contributions are still to be determined.

There are no permanent settlements higher up the valley and access is only by foot up a rough track.

Site T02B - the study site location. (John Forrest) Site RT02B - the study site location: just above the village of Lincha. (John Forrest)

Site T02B - the study site. (John Forrest) Site RT02B - the study site. (March 2022) (John Forrest)

Site T02B - View downstream from the study site. (John Forrest) Site RT02B - View downstream from the study site. (March 2022) (John Forrest

Site T02B - View upstream from the study site. (John Forrest) Site RT02B - View upstream from the study site. (March 2022) (John Forrest