Cheung Po Stream

Cheung Po Stream is located at Yuen Long, northwest New Territories. The upper part is an Ecologically Important Stream. The lower part was channelized in 2011.

Map of the river
camera
River upstream picture River downstream picture

Click the below photos for upstream and downstream details

River upstream picture River downstream picture

Cheung Po Stream Upstream

pH

Dissolved Oxygen of UpstreamPH of UpstreamBOD5 of UpstreamNH3-N of UpstreamDissolved Oxygen of downstreamPH of downstreamBOD5 of downstreamNH3-N of downstream

If the result is under detection limit, it would be presented as detection limit in the charts.

Dissolved Oxygen - Saturation (% )

pH

5-day Biochemical Oxygen Demand (mg/L)

Ammonia as N(mg/L)

Dissolved Oxygen (DO) indicates the total amount of oxygen dissolved in the river channel water. DO supports aquatic fauna for respiration and maintenance of life. Dissolved Oxygen Saturation (DO (%)) falling in to 91 – 110% means excellent water quality with dissolved oxygen near or at saturation

Provides indication of anthropogenic pollutants. pH falling into 6.5–8.5 indicating that there is unpolluted surface water supporting most of the aquatic biota.

5-day Biochemical Oxygen Demand (BOD5) is the measure of the amount of dissolved oxygen consumed to break down organic material in five days by biological processes. High BOD5 level indicates water pollution. BOD5≤3 mg/L indicates excellent water quality

Ammonia-Nitrogen (NH3-N) Indicates the extent of organic contamination of the river channel. NH3-N < 0.5mg/L means that there is limited contamination by nutrient

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