HYDRODYNAMIC AND WATER QUALITY MODELLING IN SYDNEY HARBOUR

The Sydney Harbour waterway modelling suite examines the changes in water quality in the harbour estuary and its tributaries associated with stormwater runoff and wet weather sewage overflows from the upstream catchments, in Sydney Australia. This paper discusses the development and performance of the numerical models. The models have been used to investigate the spatial variability of catchment pollutant loads and the impacts of sewer overflows on the water quality in the Sydney Harbour estuary. The scenario modelling results demonstrate that sewer overflows have a minimal impact on the Sydney Harbour estuary water quality, with stormwater dominating most changes in water quality.

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Water quality modelling for decision-making: the drinking-water watersheds of Sydney, Australia

From landscape research to landscape planning - Wageningen UR Frontis Series ◽

10.1007/978-1-4020-5363-4_10 ◽

2007 ◽

pp. 133-142

Author(s):

Les McNamara

Keyword(s):

Water Quality ◽

Decision Making ◽

Drinking Water ◽

Water Quality Modelling ◽

Sydney Australia

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Spatial Statistical Approaches to Water Quality Modelling

10.15760/etd.7383 ◽

2000 ◽

Author(s):

Janardan Mainali

Keyword(s):

Water Quality ◽

Water Quality Modelling ◽

Statistical Approaches

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Water quality of Tampa Bay, Florida : wet-weather conditions, October 1971

Open-File Report ◽

10.3133/otherfl75005 ◽

1975 ◽

Author(s):

Carl R. Goodwin ◽

Joseph S. Rosenshein ◽

D.M. Michaelis

Keyword(s):

Water Quality ◽

Weather Conditions ◽

Tampa Bay ◽

Wet Weather

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Wet Weather and Water Quality - 30 Years Later and All the Same Questions Remain

Proceedings of the Water Environment Federation ◽

10.2175/193864718825137412 ◽

2018 ◽

Vol 2018 (17) ◽

pp. 660-688

Author(s):

Patrick Bradley ◽

Patrick Fanning

Keyword(s):

Water Quality ◽

Wet Weather

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109 Phytate supplementation has minimal impact on mineral digestibility in horses

Journal of Animal Science ◽

10.1093/jas/skaa278.163 ◽

2020 ◽

Vol 98 (Supplement_4) ◽

pp. 89-90

Author(s):

Katy Brinkley-Bissinger ◽

Laura M Cersosimo ◽

Kathleen E Sullivan ◽

Shannon E Livingston ◽

Jill M Bobel ◽

...

Keyword(s):

Inductively Coupled Plasma ◽

Mixed Model ◽

Divalent Cations ◽

Basal Diet ◽

Minimal Impact ◽

Inductively Coupled ◽

Mixed Model Anova ◽

Microbial Phytase ◽

And Performance ◽

Inorganic Mineral

Abstract Phosphorus in equine rations is supplied by inorganic mineral fortification or naturally-occurring P in forages and grains. Up to 70% of P in plant material is bound to phytate. In monogastrics like poultry and swine, phytate can reduce absorption of P and divalent cations, but the extent that this occurs in horses is unknown. This study tested the hypothesis that phytate decreases mineral digestibility in horses. Six mature Quarter Horse geldings (mean ± SE, 586 ± 19 kg, 10 ± 1.5 y) were randomly assigned to two treatments applied in a cross-over design: IP6 (Ca-Mg-phytate isolated from rice bran fed at 15 mg phytic acid/kg BW) or CON (equivalent Ca, Mg and P from inorganic minerals to match intake from IP6). The level of phytate added represented an amount present in grain-rich rations typically fed to broodmares, growing horses and performance athletes. Supplements were added to a basal diet (1.75% BW, DM basis) consisting of 75% timothy hay and 25% roughage-based concentrate. Each 14-d period had an 11-d treatment adaptation followed by a 3-d total fecal collection. After acid digestion, P was determined colorimetrically and other minerals were determined by inductively coupled plasma spectrometry. Data were analyzed using mixed model ANOVA. Intakes of Ca, P, Mg, Zn, Cu and Fe were similar between treatments (140, 72, 40, 1.05, 0.24, and 1.78 mg/kg BW respectively). Apparent P digestibility (18.8 and 17%, SEM 1.9; P = 0.41) and estimates of true P digestibility (32.8 and 30.8%, SEM 1.9; P = 0.39) were similar between CON and IP6. Apparent digestibilities of other minerals were also not affected by IP6 supplementation. Findings suggest horses have sufficient microbial phytase activity in the gastrointestinal tract to mitigate impacts of dietary phytate. Higher levels or different forms of phytate and marginal mineral intake may yield different results.

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