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Method for calculating the flow in unpressurised pipework using the Manning Strickler formula. The flow is determined according to the diameter, fill level, slope and Strickler coefficient. The maximum flow is achieved with a fill level of 94%. The Strickler coefficient depends on the material used, ranging from 62 to 77 for rough concrete, 71 to 90 for smooth concrete, and 90 to 120 for polymers.
| DN (mm): | |
| SDR: | |
| CR/SN PE80 (kN/m2): | - |
| CR/SN PE100 (kN/m2): | - |
| Diamètre intérieur (mm): | - |
| Taux de remplissage (% - Débit max pour taux = 94%) | |
| Pente (mm/m) | |
| Coefficient Strickler (40 à 120) | |
| Débit (l/s) |
| Vitesse (m/s) |
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