Patio under Deck gets wet every time it rains...any ideas to prevent?

ARE YOUR GUTTERS RUNNING OVER THE SIDE AND ONTO THE DECK? IF THEY ARE YOU WILL NEED SOME KIND OF GUTTER COVERS THAT WILL PREVENT THE WATER FROM COMING OVER THE SIDES.

This relies on

How wet is the patio? 2 gallons? 5, 7, 20? 300 Gallons?

You likely need to place a small 3 inch pipe, 6 feet long and a flood drain in the patio unless it is excessive: 5 gallons is excessive.

Mosquitos breed and bite.

Excessive usually means abiding city ordinances and you may or may not need a permit.

You can always direct to a hidden buried 5 to 50 gallon tank with at least 2 inch diameter pvc pipe, or use that same pipe at 6 feet length to make a tiny tank.

As, Either way, you need that pipe deep into the ground, even if you have small capacities problems, you usually are best to dig 1 deep hole per each gallon, just like you were planting a tree.

While you are digging, it is quite easy to makeshift small tanks or even an irrigation or dispersion system.

Makeshifting small runoff tanks [8 gallons or less]

These are simpler than they sound.

1. At Dollar Tree they have 1 gallon Buckets, usually a

dollar, [you may need to snip off plastic handles] buy at

least 8, [or 1 per each gallon of runoff you expect if it is

less than 8 gallons each 2 days]

2. Dig a 2 foot 6 inch deep hole [and pour concrete at the

base, about 2 inches of concrete or less in a circle bigger

than the top of the bucket, if you want a containing tank

rather than a dispersion tank]

3. After you cut a 2 inch hole in the bottom of the very

cheap bucket, (or bottom & sides of several very cheap

buckets) you place these upside down in your deep

Hole on the wet concrete.

3. Jam some 2 inch pvc in all the bucket holes [or just

squeeze the cheap flexible buckets together at the holes

and duct tape them around the perimeters]

4. Cover up your makeshift tank system mold with at

least 2 inches of concrete.

5. Let the concrete set, 2 days.

6. Cover your hidden runoff tank system with the soil you

took out.

Makeshifting Water Collection/Irrigation [Up to 400 gallons

a day]

These are somewhat same, except you may want to use

up to 80 qty higher grade 5 gallon buckets instead of very

cheap $1 buckets.

These oft are attached to a Concrete Sprinkler System,

[See Below] with a pump or a Standard Dispersion

System [see below]

Concrete sprinkler system [with Solar Pump]:

It's amazing what you can do with an old hose, any drill,

50 Straws [or 48 qty 5 inch long pieces of 1/4 inch dowel]

480 pounds of concrete and a weekend...

To so do this with rainwater collection, you need to

attach a solar pump and hose to the 40 gallon contained

Tank System.

Standard dispersion system [400 gallons a week]

Much like a concrete Sprinkler system, also is dispersion

systems. These bury underground, with the sprinkler

hose facing down and that covers with concrete.

You can use an old hose or drill holes in PVC. Either

result is same: When talking about huge runoff

problems, you can disperse and maintain hundreds of

gallons in a 5 inch PVC, 50 Feet long, including turns by

elbows, with 1/2 inch holes at the base.

Either of these will resolve for 50 years, mostly any and all small scale residential Water Crises.

When talking civil, corporate or industrial, you use multiple, like: 50 qty 400 gallon containment tank systems.

I have seen a balcony over a patio on a condo we were going to purchase. The owner put a fiberglass corrugated panel under the balcony with the end pointing away from the house and slightly tilt the panel to have the water run off the panel to the edge of the patio. Easy - peasy! Keeps the patio dry and would allow you to sit on the patio during a rainstorm.