We are designing an U/G car parking
We are designing an U/G car parking
(OP)
We are designing an U/G car parking garage of 16,000.00 S.F. My question how we estimate hoe many Area Drain, spacing and best location ? Thanks for you help and or advise any referrence or books to use.





RE: We are designing an U/G car parking
At entries and exits are typically located trench drains.
Bear in mind you will have people walking about so will want to plan slopes to drain away from main walking paths.
Have it go through an oil-water separator.
RE: We are designing an U/G car parking
for flat roof rain water, we have the S.T and the denisty of the rain fall.
But in U/G parking we don't have this one.
Please advise
RE: We are designing an U/G car parking
Key difference is that it is only going to apply to the perimeter where water is going to make its way in. If there is a building on top of the garage, don't forget to account for rain hitting the sides of the building and coming down the sides.
What is happening to the rain on the roof?
One major source of water I can think of is at the entry/exit(s). Rain on any ramps or swells is going to flow in toward the garage.
I don't know the details of the garage's design, so it is up to up to evaluate all potential means for water to enter the garage and design the drainage system accordingly. I would expect a lot of drains around the perimeter with few if any in the middle.
Are you in a flood zone? Does the jurisdiction you are building in have any special flood zone requirements?
RE: We are designing an U/G car parking
Water will drip off cars and be carried in with cars, wind, tyres etc so you can't just ignore it.
The worst case you will have is probably fire sprinklers assuming you have them so use that as sizing for your drains which should be a lot less than exposed car park drainage.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: We are designing an U/G car parking
RE: We are designing an U/G car parking
Depending on where you are located, only the drains on the top (if exposed to elements) will be allowed to go to the storm system (and drains at the base of any ramp leading to the top. A lot of AHJ do not want excess water from storm events going to the storm system. The other interior located drains will not be allowed to go to the storm system since they are not directly open to the elements. They have to go to the sanitary system. The drains that might receive wind driven rain may or may not have to go to the storm system. If they go to the sanitary, I would recommend upsizing them to accommodate extra flow. The drains that receive water from vertical elements of the building should go to the storm.
If the garage is not heated and in areas subject to freezing, do not put traps on the drains since they will freeze. We have been able to send these drains to a master trap (sand/oil interceptor) which is vented. We do not vent the drains (no traps).
RE: We are designing an U/G car parking