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Marine Water Quality in Hong Kong in 2001 7 - 1

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Marine Water Quality in Hong Kong in 2001 7 - 1 Chapter 7 Mirs Bay Water Control Zone Water Quality in 2001 Compliance with Water Quality Objectives 7.1 The Mirs Bay Water Control Zone 7.4 The Mirs Bay WCZ has had an (WCZ) has a very good and uniform water excellent record of Water Quality quality, with low turbidity, E.coli, 5-day Objective (WQO) compliance in the last Biochemical Oxygen Demand (BOD5) and 10 years (Figure 7.1). Full compliance with nutrients. The only exception is the the WQOs for dissolved oxygen, total Starling Inlet (Sha Tau Kok Hoi), a inorganic nitrogen and unionised ammonia semi-enclosed bay with restricted tidal was again achieved in 2001. flow. Station MM1 at Starling Inlet has higher bacterial counts, suspended solids, 7.5 The secondary contact recreation inorganic nutrients and chlorophyll-a than subzones: Crooked Harbour (MM2), Long the rest of the WCZ. A summary of the Harbour (MM6) and Double Haven 2001 water quality data of the Mirs Bay (MM7), fully complied with the E.coli WCZ is shown in Tables D8 and D9 of objective in 2001 (Figure 7.1), indicating Appendix D. their excellent bacteriological quality. 7.2 Similar to other marine waters in Long-term Water Quality Trends the territory, the dissolved oxygen (DO) in Mirs Bay was found to decrease in 2001. In general, the drop was more noticeable in 7.6 The water quality in the Mirs Bay the northern and more enclosed parts of the WCZ has remained stable over the years. bay. The reduction of DO was less than The two notable trends detected include: 0.4mg/L in the southern part of the bay a) a general decrease in total phosphorus; (MM8, MM13-16); 0.8-1.0mg/L in the and b) increases in chlorophyll-a in the northern part (MM3-MM6, MM17) and northern and southern parts of the WCZ 1.1-1.4mg/L around Starling Inlet (MM1) (Table 7.1 and Figure 7.2). and Crooked Island (MM2 and MM7). 7.7 To maintain the good water quality 7.3 The annual mean E.coli at Starling in Mirs Bay, the Government would Inlet (MM1) showed a 60% increase in continue with the provision of sewerage to 2001, reaching 320 cfu/100mL – the unsewered villages in the catchment second highest in record next to that in according to the North District Sewerage 1997. In parallel, ammonia nitrogen also Master Plan. increased by nearly 20% in 2001. So far the water quality deterioration was mostly confined to the Starling Inlet. 海 Marine Water Quality in Hong Kong in 2001 7 - 1 Chapter 7 Mirs Bay Water Control Zone Dissolved Oxygen (DO) Dissolved Oxygen (DO) (bottom) (depth-averaged) 100% 100% WQO WQO MM1 MM1 0% 0% 92 93 94 95 96 97 98 99 00 01 92 93 94 95 96 97 98 99 00 01 Year Year 100% 100% WQO WQO MM2 MM2 0% 0% 92 93 94 95 96 97 98 99 00 01 92 93 94 95 96 97 98 99 00 01 Year Year 100% 100% WQO WQO MM3 MM3 0% 0% 92 93 94 95 96 97 98 99 00 01 92 93 94 95 96 97 98 99 00 01 Year Year 100% 100% WQO WQO MM4 MM4 0% 0% 92 93 94 95 96 97 98 99 00 01 92 93 94 95 96 97 98 99 00 01 Year Year 100% 100% WQO WQO MM5 MM5 0% 0% 92 93 94 95 96 97 98 99 00 01 92 93 94 95 96 97 98 99 00 01 Year Year 100% WQO 100% WQO MM6 MM6 0% 0% 92 93 94 95 96 97 98 99 00 01 92 93 94 95 96 97 98 99 00 01 Year Year 100% 100% WQO WQO MM7 MM7 0% 0% 92 93 94 95 96 97 98 99 00 01 92 93 94 95 96 97 98 99 00 01 Year Year Shenzhen N Dissolved Oxygen (DO) 1. Bottom 100% WQO MM2 MM3 WQO : 90% sample with bottom DO > 2 mg/L MM1 MM4 % sample with bottom DO > 2 mg/L 0% MM7 MM5 2. Depth-averaged WQO : 90% sample with depth-averaged 100% WQO DO > 4 mg/L MM6 % sample with depth-averaged 0% DO > 4 mg/L Non-compliance Sha Tin Figure 7.1 Level of compliance with key water quality objectives in the Mirs Bay WCZ 海 Marine Water Quality in Hong Kong in 2001 7 - 2 Chapter 7 Mirs Bay Water Control Zone Dissolved Oxygen (DO) Dissolved Oxygen (DO) (bottom) (depth-averaged) 100% WQO 100% WQO MM8 MM8 0% 0% 92 93 94 95 96 97 98 99 00 01 92 93 94 95 96 97 98 99 00 01 Year Year 100% 100% WQO WQO MM13 MM13 0% 0% 92 93 94 95 96 97 98 99 00 01 92 93 94 95 96 97 98 99 00 01 Year Year 100% WQO 100% WQO MM14 MM14 0% 0% 92 93 94 95 96 97 98 99 00 01 92 93 94 95 96 97 98 99 00 01 Year Year 100% 100% WQO WQO MM15 MM15 0% 0% 92 93 94 95 96 97 98 99 00 01 92 93 94 95 96 97 98 99 00 01 Year Year 100% WQO 100% WQO MM16 MM16 0% 0% 92 93 94 95 96 97 98 99 00 01 92 93 94 95 96 97 98 99 00 01 Year Year 100% 100% WQO WQO MM17 MM17 0% 0% 92 93 94 95 96 97 98 99 00 01 92 93 94 95 96 97 98 99 00 01 Year Year 100% 100% WQO WQO MM19 MM19 0% 0% 92 93 94 95 96 97 98 99 00 01 92 93 94 95 96 97 98 99 00 01 Year Year MM17 Tai Po N Dissolved Oxygen (DO) MM16 1. Bottom 100% WQO WQO : 90% sample with bottom DO > 2 mg/L Sai Kung % sample with bottom DO > 2 mg/L 0% 2. Depth-averaged MM15 WQO : 90% sample with depth-averaged 100% WQO DO > 4 mg/L % sample with depth-averaged 0% DO > 4 mg/L MM19 MM14 Non-compliance No data ; monitoring has not started MM8 MM13 Figure 7.1 Level of compliance with key water quality objectives in the Mirs Bay WCZ (continued) 海 Marine Water Quality in Hong Kong in 2001 7 - 3 Chapter 7 Mirs Bay Water Control Zone Total Inorganic Nitrogen (TIN) Unionised Ammonia (NH3-N) (depth-averaged) (depth-averaged) TIN (mg/L) NH3-N (mg/L) 0.021 WQO 0.3 WQO 0.2 MM1 MM1 0.1 0 0 92 93 94 95 96 97 98 99 00 01 92 93 94 95 96 97 98 99 00 01 Year Year TIN (mg/L) NH3-N (mg/L) 0.021 WQO 0.3 WQO 0.2 MM2 0.1 MM2 0 0 92 93 94 95 96 97 98 99 00 01 92 93 94 95 96 97 98 99 00 01 Year Year TIN (mg/L) NH3-N (mg/L) 0.021 WQO 0.3 WQO 0.2 MM3 0.1 MM3 0 0 92 93 94 95 96 97 98 99 00 01 92 93 94 95 96 97 98 99 00 01 Year Year TIN (mg/L) NH3-N (mg/L) 0.021 WQO 0.3 WQO 0.2 MM4 0.1 MM4 0 0 92 93 94 95 96 97 98 99 00 01 92 93 94 95 96 97 98 99 00 01 Year Year TIN (mg/L) NH3-N (mg/L) 0.021 WQO 0.3 WQO 0.2 MM5 0.1 MM5 0 0 92 93 94 95 96 97 98 99 00 01 92 93 94 95 96 97 98 99 00 01 Year Year TIN (mg/L) NH3-N (mg/L) 0.021 WQO 0.3 WQO 0.2 MM6 MM6 0.1 0 0 92 93 94 95 96 97 98 99 00 01 92 93 94 95 96 97 98 99 00 01 Year Year TIN (mg/L) NH3-N (mg/L) 0.021 WQO 0.3 WQO 0.2 MM7 0.1 MM7 0 0 92 93 94 95 96 97 98 99 00 01 92 93 94 95 96 97 98 99 00 01 Year Year Total Inorganic Nitrogen (TIN) N Shenzhen TIN (mg/L) WQO : annual mean for depth-averaged TIN < 0.3 mg/L 0.3 WQO MM2 MM3 MM1 MM4 annual mean for depth-averaged TIN 0 MM7 MM5 Unionised Ammonia (NH3-N) NH -N (mg/L) WQO : annual mean for depth-averaged 3 WQO NH3-N < 0.021 mg/L 0.021 MM6 annual mean for depth-averaged NH3-N 0 Sha Tin Non-compliance Figure 7.1 Level of compliance with key water quality objectives in the Mirs Bay WCZ (continued) 海 Marine Water Quality in Hong Kong in 2001 7 - 4 Chapter 7 Mirs Bay Water Control Zone Total Inorganic Nitrogen (TIN) Unionised Ammonia (NH3-N) (depth-averaged) (depth-averaged) TIN (mg/L) NH3-N (mg/L) 0.021 WQO 0.3 WQO 0.2 MM8 0.1 MM8 0 0 92 93 94 95 96 97 98 99 00 01 92 93 94 95 96 97 98 99 00 01 Year Year TIN (mg/L) NH3-N (mg/L) 0.021 WQO 0.3 WQO 0.2 MM13 0.1 MM13 0 0 92 93 94 95 96 97 98 99 00 01 92 93 94 95 96 97 98 99 00 01 Year Year TIN (mg/L) NH3-N (mg/L) 0.021 WQO 0.3 WQO 0.2 MM14 0.1 MM14 0 0 92 93 94 95 96 97 98 99 00 01 92 93 94 95 96 97 98 99 00 01 Year Year TIN (mg/L) NH3-N (mg/L) 0.021 WQO 0.3 WQO 0.2 MM15 0.1 MM15 0 0 92 93 94 95 96 97 98 99 00 01 92 93 94 95 96 97 98 99 00 01 Year Year TIN (mg/L) NH3-N (mg/L) 0.021 WQO 0.3 WQO 0.2 MM16 0.1 MM16 0 0 92 93 94 95 96 97 98 99 00 01 92 93 94 95 96 97 98 99 00 01 Year Year TIN (mg/L) NH3-N (mg/L) 0.021 WQO 0.3 WQO 0.2 MM17 0.1 MM17 0 0 92 93 94 95 96 97 98 99 00 01 92 93 94 95 96 97 98 99 00 01 Year Year TIN (mg/L) NH3-N (mg/L) 0.021 WQO 0.3 WQO 0.2 MM19 0.1 MM19 0 0 92 93 94 95 96 97 98 99 00 01 92 93 94 95 96 97 98 99 00 01 Year Year MM17 Tai Po N Total Inorganic Nitrogen (TIN) TIN (mg/L) MM16 WQO : annual mean for depth-averaged TIN < 0.3 mg/L 0.3 WQO Sai Kung annual mean for depth-averaged TIN 0 Unionised Ammonia (NH3-N) MM15 NH -N (mg/L) WQO : annual mean for depth-averaged 3 WQO NH3-N < 0.021 mg/L 0.021 annual mean for depth-averaged NH3-N 0 MM19 MM14 Non-compliance No data ; monitoring has not started MM8 MM13 Figure 7.1 Level of compliance with key water quality objectives in the Mirs Bay WCZ (continued) 海 Marine Water Quality in Hong Kong in 2001 7 - 5 Chapter 7 Mirs Bay Water Control Zone E.
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