How do I calculate how much rainwater comes off my roof?
Short answer: Multiply the horizontal roof area by rainfall depth; every inch of rain produces about 0.623 gallons per square foot.
Here is the plain version: multiply the horizontal roof area by rainfall depth; every inch of rain produces about 0.623 gallons per square foot. That is the part most homeowners never get told — the water has to go somewhere, and the system that moves it has to be sized and laid out for the water your roof and yard actually produce, not just for an average day.
In Atascocita and across the Lake Houston area, the rain does not always come gently. A short, hard burst can put more water on a roof and yard in a few minutes than a whole afternoon of light rain, and that is usually when a system that seemed fine shows its weak spot. What matters is not whether the system works on a dry day, but whether it holds up when the water is really moving.
The fix depends on your roof, your yard, and where the water is actually going — there is no one-size answer that fits every house. That is why we look at the property in person, in real conditions when we can, before we recommend anything. We would rather tell you what is actually wrong than sell you a part you do not need.
What we check in Atascocita
When we look at this in Atascocita, we walk the roofline and the yard together. We check the gutter size and pitch, where the valleys feed in, how many downspouts are carrying the load, and where each downspout actually discharges — because the gutter is only half the system. If the discharge point cannot take the water, the gutter cannot fix it alone. See seamless gutters for how we build the system as a whole.
Related reading: Seamless gutters · All questions · Contact us
Frequently asked questions
How do I work out the number for my own roof? Measure the horizontal footprint of the roof — not the sloped surface — and apply the same volume rule. If you are not sure of the footprint, we can measure it on site and walk you through what it means for your gutters.
Do I need a professional to look at it? If the problem keeps happening, yes — especially anything on the roofline or underground, where you cannot see what is actually going on. Call or text (281) 504-9998 and we will take a look.
Do you serve Atascocita? Yes. Orion’s Rain serves Kingwood and the Lake Houston area — Kingwood, Atascocita, Porter, Humble, New Caney, Summerwood, Fall Creek, Huffman, and Eagle Springs. Call or text (281) 504-9998, 24 hours a day.
Related questions
- How much water actually comes off my roof during a rainstorm?
- Does a steeper roof collect more rainwater than a flatter roof?
- Can gutters and downspouts solve a wet yard problem?
Get it looked at
If this sounds like your yard in Atascocita, call or text Orion’s Rain at (281) 504-9998 — 24 hours a day. We will test the system and tell you what is actually wrong, and what it will take to fix it the right way.
Orion’s Rain Smartscapes and Exteriors — (281) 504-9998 — LI0029444