Drainage & Excavation · Nashville, TN

Where Water Should Go on a Nashville Lot

Almost every drainage solution starts with the same question, and it is where the water is meant to end up.

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September 1, 2026 · Michael Blair

Every drainage design depends on somewhere lower for the water to go. On a flat Middle Tennessee lot on clay, that question is the whole problem rather than a detail.

Start with the grade

The ground should fall away from the house — commonly around six inches over the first ten feet. Settled beds, added mulch and landscaping frequently reverse it without anyone noticing.

Correcting grade is cheaper than any piped solution and it addresses the cause rather than managing the symptom.

Follow the water

Watch during a real storm rather than guessing. Where it ponds, where it runs, where it arrives from uphill and where it leaves.

That fifteen minutes tells you more than any amount of measuring on a dry day.

Six inches of fall over the first ten feet from the house
Watch the lot during actual rain
Confirm a lower outfall exists before pricing a drain
Roof water is the largest single contributor
Clay percolates slowly — test rather than assume

Roof water first

A roof concentrates a very large volume into a few downspouts. Getting that water well away from the house resolves a surprising share of complaints on its own.

It is also the cheapest intervention available and the one most often left undone.

The flat lot problem

With no lower ground, a French drain has nowhere to discharge and becomes a buried reservoir. The genuine options are a properly sized dry well, a sump and pump, or regrading to create fall.

Anyone quoting a drain without discussing the outfall has not thought about the site.

FAQ

Where Water Should Go on a Nashville Lot — questions

How much should the ground slope away from the house?

Around six inches of fall over the first ten feet is the common guidance. Settled beds and years of added mulch frequently flatten or reverse it, which is why houses that drained fine for a decade start having problems without anything obvious having changed.

Will a French drain fix a flat yard?

Not on its own. A French drain moves water to a lower point, so with no lower point it fills and stays full. On a flat Middle Tennessee lot the workable answers are a properly sized dry well, a sump and pump, or regrading to create the fall the drain needs.

Does clay soil affect drainage solutions?

Substantially. Clay accepts water slowly, so anything relying on infiltration — a dry well, a rain garden — must be sized for that rather than for average soil. A percolation test is worth doing rather than assuming, because a system designed for sandy soil simply backs up here.