The formula to calculate sheet flow rate is:
\[ \text{Q} = \left( \frac{1.49}{\text{n}} \right) \times \text{L}^{0.6} \times \text{S}^{0.3} \]
Where:
Sheet flow is the overland flow of water that occurs when excess stormwater spreads out over the ground surface in a thin, even layer. This type of flow is common in the early stages of runoff and occurs before the water collects into a defined channel. Understanding sheet flow is important for designing effective drainage systems and managing stormwater runoff in urban and rural areas.
Let's assume the following values:
Using the formula:
\[ \text{Q} = \left( \frac{1.49}{0.015} \right) \times 100^{0.6} \times 0.02^{0.3} = 99.33 \times 6.31 \times 0.271 = 486.86 \]
The sheet flow rate is 486.86 cubic feet per second.