What is the recommended depth for tile drains?

USDA NRCS recommends a minimum installation depth of 0.9–1.2 m to protect against frost heave, provide adequate fall for gravity flow, and allow sufficient rooting depth above the drain. Depth may be increased to 1.5–1.8 m in areas with severe frost penetration.

Does drain depth affect spacing?

Yes. Deeper drains intercept water from a wider area, allowing wider spacing for the same drainage coefficient. Doubling effective drain depth can increase optimal spacing by 30–50% while maintaining equivalent water table control.

Subsurface Drain Depth Calculator

Determine optimal installation depth for subsurface tile or perforated pipe drains to maximise hydraulic efficiency and minimise frost damage.

Crop Yield Calculator

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🌾 Agricultural Disclaimer: Results are estimates based on standard agronomic models. Local soil conditions, climate, variety selection, and management practices significantly affect actual outcomes. Consult local extension services and agronomists before making crop management decisions.

How to Use

Enter the values for the patient or scenario you are assessing. Determine optimal installation depth for subsurface tile or perforated pipe drains to maximise hydraulic efficiency and minimise frost damage. Use the drain depth result to inform your clinical assessment.

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Subsurface Drain Depth Calculator

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Frequently Asked Questions

What is the recommended depth for tile drains?

Does drain depth affect spacing?