If the perimeter drainage is done on gravity then you will need 1 sump which will be placed on the property by the demo contractor, its essential you refer to your landscape drawing so the sump is placed in a good location.
Once installed and backfilled its a lot of work to move the sump. If the perimeter drainage system is needed to be pumped then you will required 2 sumps, a lower sump that will have a pumped and a higher sump ( referring to the base of the sump ) that will still go by gravity ( this will be for your roof water ). Its always best to discharge by gravity as pumps are mechanical and prone to failure ( no one wants a flooded basement ). With the pumps there are 2 systems depending on budget and risk adversity.
The first is a simple pump with 1 float that turns the pump off and on, this will usually also have a 2nd float that will act as a high water alarm and that alarm will either be inside the home or nearby the sump. The 2nd system is far superior and more expensive, this has 2 pumps that are controlled by a panel that is usually located inside the mechanical room of the home and will osicalate between the 2 pumps and if either pump fails will still function however will sound an alarm that servicing is necessary.
This system is controlled by 3 floats an on float, off float, and high level float. It’s important to note that unless there is battery backup ( which can be installed on either system ) neither of these systems will function in the event of a power failure.
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