Changes

|Length-to-Width Ratio

|Length-to-Width Ratio

|Maximize flow path and minimize short-circuiting potential

|Maximize flow path and minimize short-circuiting potential

|i) Overall: minimum 3:1; ii) Forebay: minimum 2:1

|

#Overall: minimum 3:1;

#Forebay: minimum 2:1

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|Permanent Pool Depth

|Permanent Pool Depth

|Side Slopes  

|Side Slopes  

|Safety  

|Safety  

|i) 5:1 For 3 m above and below permanent pool (ii) Maximum 3:1 elsewhere

|

#5:1 For 3 m above and below permanent pool;

#Maximum 3:1 elsewhere

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|Inlet  

|Inlet  

|Avoid clogging/freezing  

|Avoid clogging/freezing  

|i) Minimum 450 mm; ii) Preferred pipe slope: >1%; iii) If submerged, obvert 150 mm below expected maximum ice depth

|

#Minimum 450 mm;  

#Preferred pipe slope: >1%;  

#If submerged, obvert 150 mm below expected maximum ice depth

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|Outlet  

|Outlet  

|Avoid clogging/freezing  

|Avoid clogging/freezing  

|i) Minimum: 450mm outlet pipe; ii) Preferred pipe slope: >1%; iii) If orifice control used, 75mm diameter minimum; (iv) Minimum 100mm orifice preferable

|

#Minimum: 450mm outlet pipe;  

#Preferred pipe slope: >1%;  

#If orifice control used, 75mm diameter minimum;  

#Minimum 100mm orifice preferable

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|Maintenance Access  

|Maintenance Access  

|Access for backhoes or dredging equipment

|Access for backhoes or dredging equipment

|(i) Provided to approval of Municipality; (ii) Provision of maintenance drawdown pipe preferred

|

#Provided to approval of Municipality;  

#Provision of maintenance drawdown pipe preferred

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|Buffer  

|Buffer