Two sump pumps under the house or one sump pump and another pump down the line?
My house is in a low spot so when it rains all the water comes to my house. I have a sump pump under my house to remove the water. When more water is comming in than being pumped out is it better to have 2 sump pumps side by side or 2 pumps in tandem? One sump pump under the house and another pump at ground level outside.
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Have you considered trying to divert the water around your house? You state you are in a low area, but fail to mention where does the water go that your one sump pump discharges. Is there a lower place in the yard, a tile or what. It the water does leave your property, you may be able to intercept the water with mounded soil or catch basins or subsurface drains. If you can divert the water, one sump pump may be all you need.
Two sump pumps with separate hoses! Putting them in tandem will do little unless there is quite a bit if head to pump over.
Were I you, I would consider building sump holes outside, ditches or french drains to two pump holes with rigid piping to the sewer or the street.
The worst part of this is the power to operate these pumps on! Often, during a serious storm when the pumps are needed most, we have power failures! I would certainly put the pumps on separate electrical circuits, but I would consider having either an emergency gen set on hand, or a mudhog pump as a stand by…you do not want to add to your woes with a flooded house
2 pumps side by side on seperate drain pipes
that way your pumping twice the amount
also theres a battery back up pump you can install for power outages
Separate pumps separate catch basins and as in previous answer separate circuit keeping them alone allows one to run when it is needed but also allows for a bit of redundancy if one should fail
Personally, I'd build a ditching system. Lower the ground level before the house and add a diversion wall higher than the normal ground level between the house and the new ditch to catch as much of the water as possible. Build a down-grade hill from the ditch to the sewer to allow run-off and that will help divert most of the water away from the house and will make pumping the left-overs a lot easier.
If you get a contractor, you could probably even cement the area under the house with a down-grade hill to avoid build up and to allow an immediate run-off to the street.
I have three sump pumps with three separate lines to the ditch to take the water away. The first is my primary AC pump, then I have a backup DC pump that turns on when the water level is higher than the first AC pump, the last is a backup AC pump that turns on if the water level in the sump hole is higher than the level required to turn on the backup DC pump, and I have a back up generator as well. I had an incident where the water level became too much for one pump and I eventually had 5 pumps running to clear out the basement.
As mentioned by the others, make sure that there are separate circuits to power the two AC pumps, and that the lines all go to the ditch.