In the Hill Country it's almost always grade first, then Blackland clay and caliche, then a flash storm big enough to expose them. Here's how to read which one is yours — and which fixes are cheap. The first Site Read is free.
Usually grade firstThen clay & calicheFree Site Read
A flooding yard feels like a mystery. It isn't. In this part of Texas there are four usual causes, and they stack in a predictable order — grade, then clay, then caliche, then the storm that exposes all three.
Most people reach for a French drain before they know which cause they have. That's backward. Read the cause first, because the cheapest fix and the most common cause are the same thing: grade.
§ 1 · The four usual causes
What's actually wrong.
Grade. The ground should fall about six inches over the first ten feet away from the foundation. When it doesn't — or it slopes back toward the house — water collects where it should have shed. This is the most common cause and the cheapest to fix.
Blackland clay. Our soil holds water right at the surface instead of letting it soak in. A yard over heavy clay can be graded fine and still puddle, because the water has nowhere to go down.
Caliche. A hard rock layer under the topsoil that caps infiltration like a lid. Even if the surface drains, water hits the caliche and stops — so it backs up and spreads.
The flash storm. A Hill Country storm can drop two to three inches in an hour. That's far more water than clay and caliche can absorb in the time it falls, so it runs across the surface — and you finally see the problem that was there all along.
§ 2 · How to tell which one you have
Read your own yard.
Water pools against the house. Look at the slope right at the foundation. If the ground is flat or tilts back toward the slab, that's grade. Stand ten feet out and eyeball the drop — you want about six inches of fall.
Puddles sit for a day after it stops raining. That's the soil, not the slope — Blackland clay holding water at the surface or caliche capping it from below. The water isn't running anywhere; it's just sitting on top of ground that won't drink it.
It only floods in the big storms. Normal rain is fine, then a two-to-three-inch hour overwhelms everything. That's the flash storm exposing a slow soil — the cause was always there, the storm just made it visible.
The roof is the culprit. Follow your downspouts. If they dump right at the slab, that concentrated roof water is doing a lot of the damage, and the fix is feet of pipe, not a trench.
§ 3 · Cheap fixes vs. the real ones
Spend less first.
The two cheapest fixes solve a surprising number of yards: regrade one corner so the ground falls away from the foundation, and extend the downspouts so roof water lets out well past the house. About a third of the properties we read solve it with the diagnosis alone — no trenching at all.
When the soil itself is the problem, you move up to real work: a planted bioswale that gives the water somewhere to go and infiltrate, or a French drain where the situation calls for buried pipe. But that's the second answer, not the first. Read the grade, fix what's cheap, then build only what's left.
Is my flooding a drainage problem or a grade problem?
Most of the time it's grade first. Water that pools near the house is usually telling you the ground doesn't fall away from the foundation the way it should — you want the ground to drop about six inches over the first ten feet. If the grade is wrong, no amount of drainage pipe fixes the real cause; you're just chasing water that should never have collected there. We read the grade before we read anything else, because it's the cheapest thing to fix and the most common thing to be wrong.
Why does my yard flood only in heavy rain?
Because of what's under your grass. Blackland clay holds water right at the surface instead of soaking it in, and caliche caps infiltration like a lid of rock. In a normal rain the soil keeps up. But a Hill Country flash storm can drop two to three inches in an hour — far faster than clay and caliche can absorb — so the water has nowhere to go but across the surface, and you see it. The flooding isn't new; the storm is just big enough to expose a soil that was never going to drain fast.
Can I fix it myself?
Often, yes. The two cheapest fixes are the ones that solve most yards: regrade one corner so the ground falls away from the foundation, and run downspout extensions so the roof water lets out well past the house instead of dumping at the slab. About a third of the properties we read solve it with the diagnosis alone — no trenching, no French drain. If your problem is grade or downspouts, you may not need a contractor at all, and we'll tell you that for free.
Is the assessment free?
The first Site Read is free — a 60-to-90-minute on-site reading of your property and the actual storm flow path, plus a written diagnosis within 48 hours. You find out which of the four causes is yours, and whether it's a fix you can do yourself. It's the honest version of an estimate: you get a real plan whether or not you build with us.
Start here
Read it before you spend.
We walk the storm path on your property and write the diagnosis in 48 hours — which cause is yours, and whether you can fix it yourself. No charge — the first Site Read is free.