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Arriving at the most cost effective solution means taking account of nine parameters:
- volume of storage required – say 550 cubic meters
- gravity or pumped system? – say gravity
- if gravity, the depths available – say 4 meters
- if pumped, the maximum desired depth – not applicable here
- site constraints (the plan area available) – say 42 x 15 meters
- loading criteria – HA (Highways Agency) only
- design life required – say 100 years
- allowable discharge – say 11 liters/second
- environmental classification – say non-aggressive
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