Action and Limit Levels of Disturbance to Waterbirds using Ng Tung, Sheung Yue and Shek Sheung Rivers during Construction Phase

Action Level:

• Decline in numbers of all waterbird species relative to numbers during Baseline Monitoring such that the Action Level response is triggered; or
• Decline in numbers of any one waterbird species occurring in significant numbers* during Baseline Monitoring such that the Action Level response is triggered.

Limit Level:

• Decline in numbers of all waterbird species relative to numbers during baseline monitoring such that the limit level response is triggered; or
• Decline in numbers of any one waterbird species occurring in significant numbers* during Baseline Monitoring such that the Limit Level response is triggered.

*Note: Whether numbers are significant depend on species and season after collection and evaluation of baseline survey data.

Ecological Monitoring Data (Waterbirds)

Year	Month	Day	Season	Total no. of Waterbird Species from PCs* (High Tide)	Total no. of Waterbird Species from PCs*(Low Tide)	Impact Waterbird Abundance from PCs* (High Tide)	Impact Waterbird Abundance from PCs* (Low Tide)
2020	1	3	Winter	12	10	81	83
2020	1	10	Winter	8	11	30	32
2020	1	16	Winter	6	8	7	34
2020	1	20	Winter	11	8	40	42
2020	2	4	Winter	8	12	19	38
2020	2	12	Winter	9	9	41	60
2020	2	20	Winter	10	13	17	67
2020	2	25	Winter	8	8	25	62
2020	3	2	Winter	10	9	64	46
2020	3	10	Winter	8	9	57	33
2020	3	17	Winter	5	7	20	46
2020	3	24	Winter	9	8	28	26
2020	3	30	Winter	6	8	17	28
2020	4	8	Summer	8	8	41	40
2020	4	14	Summer	3	4	13	37
2020	4	24	Summer	6	7	16	33
2020	4	27	Summer	5	4	19	22
2020	5	5	Summer	4	5	14	32
2020	5	11	Summer	5	8	12	36
2020	5	19	Summer	5	5	18	37
2020	5	27	Summer	4	4	17	37
2020	6	5	Summer	5	5	19	21
2020	6	11	Summer	4	5	8	29
2020	6	19	Summer	3	4	8	23
2020	6	23	Summer	2	5	6	30
2020	7	3	Summer	6	5	12	17
2020	7	7	Summer	3	3	34	16
2020	7	16	Summer	5	4	12	21
2020	7	21	Summer	4	5	8	15
2020	7	31	Summer	3	4	18	22
2020	8	6	Summer	5	6	15	32
2020	8	14	Summer	4	3	12	15
2020	8	20	Summer	4	5	16	18
2020	8	24	Summer	3	5	9	23
2020	9	3	Summer	5	6	13	66
2020	9	8	Summer	4	4	8	30
2020	9	15	Summer	5	7	15	44
2020	9	22	Summer	2	6	11	48
2020	9	28	Summer	5	9	14	56
2020	10	5	Winter	4	6	7	47
2020	10	16	Winter	6	9	21	36
2020	10	20	Winter	5	7	20	37
2020	10	28	Winter	5	7	14	38
2020	11	5	Winter	4	10	31	57
2020	11	9	Winter	7	9	30	68
2020	11	20	Winter	9	8	30	30
2020	11	23	Winter	6	9	24	54
2020	11	30	Winter	6	11	24	65
2020	12	11	Winter	9	9	18	53
2020	12	14	Winter	6	8	18	38
2020	12	21	Winter	8	10	37	52
2020	12	30	Winter	7	6	39	31
2021	1	5	Winter	6	9	24	37
2021	1	15	Winter	8	10	27	45
2021	1	18	Winter	8	11	28	46
2021	1	26	Winter	7	7	27	67
2021	2	5	Winter	5	6	16	38
2021	2	10	Winter	6	7	17	41
2021	2	18	Winter	5	6	14	36
2021	2	26	Winter	6	7	27	35
2021	3	1	Winter	5	8	16	40
2021	3	12	Winter	6	9	20	50
2021	3	16	Winter	5	6	11	39
2021	3	26	Winter	5	7	10	30
2021	3	29	Winter	5	6	15	29
2021	4	8	Summer	4	6	13	36
2021	4	12	Summer	5	6	23	38
2021	4	23	Summer	3	4	10	24
2021	4	26	Summer	5	6	17	33
2021	5	7	Summer	4	5	18	21
2021	5	10	Summer	4	5	15	35
2021	5	17	Summer	4	5	9	28
2021	5	24	Summer	4	3	18	11
2021	6	3	Summer	5	4	19	31
2021	6	7	Summer	4	4	15	26
2021	6	18	Summer	4	4	12	22
2021	6	21	Summer	4	5	15	29
2021	7	2	Summer	3	5	17	24
2021	7	7	Summer	4	4	16	15
2021	7	16	Summer	4	5	17	48
2021	7	22	Summer	4	3	20	25
2021	7	28	Summer	5	4	38	50
2021	8	5	Summer	4	3	16	18
2021	8	13	Summer	4	3	19	20
2021	8	20	Summer	4	4	14	20
2021	8	23	Summer	2	3	10	20

*PCs = Point Counts

Monitoring Location