Right Hand Services by JP
Passive Micro-Drainage Swale Depth Calculator — Carousel Deck
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Your drainage problem isn't water — it's grade
Most 'drainage issues' are actually grade failures where water has nowhere to go. A swale with just 1% slope captures and infiltrates 90% of runoff from a 10-year storm event.
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The swale that pays for itself in one storm
A properly sized swale prevents an average of $2,800 in annual erosion damage, foundation seepage, and landscape replacement.
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Why French drains fail in NC clay
French drains in Piedmont clay soils clog within 18-24 months because clay particles migrate into gravel voids. Swales with deep-rooted plants maintain infiltration rates 10x longer.
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One percent slope is all you need
You don't need pumps or pipes. A 1% grade swale moves water passively and lets soil biology do the infiltration work.
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Size your swale to your soil
The calculator factors soil type, contributing area, and design storm to output swale depth, width, and slope for your site.
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No pumps. No pipes. No problems.
Passive swales require zero energy, zero maintenance, and zero replacement. Input your site data and get your swale specifications in seconds.
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No pumps. No pipes. No problems.
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