Metered roof drains are installed on flat roof systems. Their primary purpose is to allow a small amount of water to drain through them, and allow for water to pool on a roof top. This pooling allows for the sewage treatment plants not to be overwhelmed by the rain water. The metered roof drains must be spaced 50 feet from the roof edge and 100 feet from another metered roof drain. Each metered roof drain has 4 weirs built into its body. By removing weirs you can control the amount of water that will drain. The more weirs removed the faster the roof will drain. The roof must be engineered to hold the weight of the pooling water.
More information can be found on the web sites from the manufacturers of metered roof drains. Zurn, Mifab etc.
On floor and roof drains on the bottom (under the dome /strainer)
A roof drain is used to outsource any rain or external water that stays on the roof. Roofdrainexpress and Mifab are two great websites that offer cheap installation services.
Are you asking about and indirect waste?
About a hundred dollars a pop, its not seperatly metered so the actual cost is unknown
Yes. All sunroofs both factory and aftermarket have drains because it is impractical to totally seal a roof opening.
Metered water means that the amount of water used is measured ie metered by local utilities In other words, when your water is metered, you pay for what you consume. This water is commonly measured in meters, gallons or feet. Metering has become very popular for financial savings and conservation measures.
On the roof! I'm kidding ! If you have a carpet pull it up.The drains (usually six )are located at the low points and are just a plastic looking stopper.
I finally found the drains in each corner of the sunroof. They were covered with dirt. You can't see the ones in the rear of the sunroof but you can feel them with a screwdrive with the roof in the tilt position. I used weed eater cable to clean them. I also found 2 drains for where the water running down the front window drains. The drains for this area were clogged right below the windshield. I am starting to believe that this was my problem area rather than the sunroof. All drains are now clear and I am waiting to see if all is well.
Sometimes the drains on the roof get clogged, you may want to check them.
Yes, there are 4 drains at each corner of the sunroof which sometimes get clogged.
If it is roof drains you are talking about, this calculator may help you: http://www.portalsplus.com/drain_calc.htm
yes the a/c drain and the heater core