APPENDIX D: PRELIMINARY ESTIMATES OF
GULLY WATER DISCHARGE AND SEDIMENT FLUX
Discharge (m3/s)
Tidal
Velocity (cm/s)
TSS (mg/L)
Sediment flux (kg/s)
Month
stage
Peak
Average
Peak
Average
Peak
Average
Peak
Average
Bread Truck Gully; Cross-sectional area = 5.5 m2
May
Flood
NA
25.0
739
170
NA
1.38
NA
0.23
Ebb
NA
76.1
1148
669
NA
4.19
NA
2.80
June
Flood
NA
25.0
715
227
NA
1.38
NA
0.31
Ebb
NA
76.1
1175
512
NA
4.19
NA
2.14
September
Flood
NA
25.0
1714
429
NA
1.38
NA
0.59
Ebb
NA
76.1
1423
467
NA
4.19
NA
1.95
October
Flood
71.1
22.6
1930
847
3.9
1.24
7.55
1.05
Ebb
133.0
81.0
1329
758
7.3
4.46
9.72
3.38
November
Flood
68.6
29.9
2152
1186
3.8
1.64
8.12
1.95
Ebb
146.0
74.0
1363
885
8.0
4.07
10.94
3.60
Parachute Gully; Cross-sectional area = 9.8 m2
May
Flood
NA
27.1
983
222
NA
1.49
NA
0.33
Ebb
NA
47.0
1507
485
NA
2.59
NA
1.25
June
Flood
NA
27.1
638
250
NA
1.49
NA
0.37
Ebb
NA
47.0
854
221
NA
2.59
NA
0.57
September
Flood
NA
27.1
1740
646
NA
1.49
NA
0.96
Ebb
NA
47.0
1840
373
NA
2.59
NA
0.96
October
Flood
37.4
13.4
2733
1752
2.1
0.74
5.62
1.29
Ebb
76.0
45.0
2073
723
4.2
2.48
8.67
1.79
November
Flood
56.4
32.2
3102
2420
3.1
1.77
9.62
4.29
Ebb
72.0
49.0
2838
1285
4.0
2.70
11.24
3.46
Spring Gully; Cross-sectional area = 26.5 m2
May
Flood
NA
15.5
1850
420
NA
0.85
NA
0.36
Ebb
NA
101.9
1439
689
NA
5.60
NA
3.86
June
Flood
NA
15.5
5626
1765
NA
0.85
NA
1.50
Ebb
NA
101.9
1888
834
NA
5.60
NA
4.67
September
Flood
NA
15.5
1458
763
NA
0.85
NA
0.65
Ebb
NA
101.9
1586
608
NA
5.60
NA
3.41
October
Flood
59.7
24.5
2733
1752
3.3
1.35
8.97
2.36
Ebb
176.2
124.6
2538
619
9.7
6.85
24.60
4.24
November
Flood
51.8
17.2
3049
1757
2.8
0.95
8.69
1.66
Ebb
162.4
84.5
3776
1883
8.9
4.65
33.73
8.75
63
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