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Water running off the roof is pooling at the base and flooding the carport during heavy rains... going to add gutters to the front, and I am going to direct the water flow into an underground PVC pipe (probably 4 inch?) that flows into a drainage ditch.

Here is a picture of the house. Section A is 35 feet, and section B is 12 feet. I wanted to put only 1 downspout on it, at the location in the picture. I'm going to dig a trench and bury a pvc pipe that runs out to a drainage ditch.

http://i.imgur.com/hHEosqp.jpg

One question i have is, is it feasible to have one downspout in the middle of a run and slope both ends down towards it? If not, then i suppose i could eliminate section B, as it just drains onto a mulch bed... but i'd really like to get both sections guttered if i can, and i dont really want to use more than one downspout if i can get away with it.

My plan is to use 10 ft sections of aluminum gutters... caulked and riveted together... screw the gutters directly to the fascia to position them, and then screw the hangers into the fascia every 2 feet.

The fascia board is covered with aluminum coil stock (or flashing i guess), and it wraps up over the top of the fascia and slides up under the shingles about 1-2 inches. Here are pictures:

http://i.imgur.com/4CsVb03.jpg


http://i.imgur.com/5Ga8uVB.jpg


I'm assuming i will still need to install a drip edge (or apron or flashing or whatever it's called) under the shingles that extends into the gutter, correct? Can i just use this stuff and tack it down over the existing fascia flashing, under the shingles?

http://www.lowes.com/pd_15551-205-5610400120___?productId=3014365&pl=1&Ntt=drip+edge

Really appreciate any input.
 

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A run of 47 feet with one downspout will only work in areas of little rainfall. I would have two. As attractive as low cost materials from a big box store seems, I would go the route of one continuous gutter. There are companies that will drive up to your house and make whatever lengths you need and then drive away. They will even have all the parts you need to do the job. The gutter material will be beefier then the big box stores and it will be easier to install.
 
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47ft to one drain is not an issue, use the large pipes and slope it, it should work fine. The 10' sections is gutter suck, they're actually harder to work with then a continuous run.
If you wanna do it yourself,call a couple of gutter suppliers and see if you can get a cut and drop. The cost would be very similar.

That drop edge would work fine.
 

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47' is an awful big chunk to handle through a 5" (or even 6") if you are going to be sending it through 60' of what appears to be modestly pitched drain pipe.

Seamless are going to be a much better bet her and if you are running that long stretch, I would definitely opt for the 6" and 4x3 downs.

You do need a drip edge on there as well.

I would probably opt for two downspouts. Seems like grade on the carport side would foster some drainage there.
 

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As others have said I would find a "chop and drop" to get you one seamless piece of gutter. You will need some pals and step ladders to hang it. Start fastening at the far left getting it high enough to allow about an 1" drop to the downspout 35 feet away. Then raise it going the other way 1/2" and your fine. I think given the amount of roof above the picture shows you can get by with 5" gutter but to be safe you might go with a 3x4 downspout system rather than a 2x3.
The amount of water a downspout handles is as much about roof area as gutter length. A 20 foot gutter with 20 feet of roof running up takes the same amount of water as a 40 foot gutter with 10 feet of roof.
A general/rough rule of thumb is a 2x3 downspout should handle 600 sq ft of roof and a 3x4 should handle 1200 for an average rainfall. Fiiigure out your roof area then decide 2x3 or 3x4. In any case just looking at the picture one downspout should be OK. Your roof run from eve to ridge doesn't look more than 12-15 feet to me.
 
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