Calculateur de Gravier de Drainage Gratuit
Calculez la quantité de gravier de drainage nécessaire pour votre tranchée ou système de drainage. Estimez le volume et le tonnage.
Gravel Needed
2.6 cu yd
Gravel Needed vs Trench Length
Formule
Drainage Gravel Calculation
Gravel Volume = Trench Volume - Pipe Volume
The perforated pipe displaces some of the trench volume. Subtract its cross-sectional area multiplied by the trench length to get the net gravel volume. Use washed, angular gravel (3/4 to 1-1/2 inch) for good drainage.
Exemple Résolu
50 ft French drain, 12 in wide, 18 in deep, with 4-inch pipe.
- 01Trench volume = 50 x 1 x 1.5 = 75 cu ft
- 02Pipe volume = 50 x pi x (2/12) squared = 2.18 cu ft
- 03Gravel = (75 - 2.18) / 27 = 2.7 cu yd
- 04Weight = 2.7 x 1.4 = 3.8 tons
Questions Fréquentes
What kind of gravel for French drains?
Use clean, washed gravel in 3/4 to 1-1/2 inch size. Avoid crushed limestone with fines, as the fine particles can clog the system over time.
Do I need filter fabric?
Yes, wrap the pipe in filter fabric or line the trench with it to prevent soil from migrating into the gravel and clogging the drain.
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