Civil Engineering Formulas

1. Beam Deflection

d = (5wL4) / (384EI)

Where d is deflection, w is uniform load, L is beam length, E is modulus of elasticity, I is moment of inertia

2. Stress

s = F / A

Where s is stress, F is force, A is area

3. Water Flow Rate

Q = A * v

Where Q is flow rate, A is cross-sectional area, v is velocity

4. Manning's Equation

v = (1/n) * R^(2/3) * S^(1/2)

Where v is velocity, n is Manning's roughness coefficient, R is hydraulic radius, S is slope

5. Beam Deflection

d = (5wL4) / (384EI)

Where d is deflection, w is uniform load, L is beam length, E is modulus of elasticity, I is moment of inertia

6. Stress

s = F / A

Where s is stress, F is force, A is area

7. Water Flow Rate

Q = A * v

Where Q is flow rate, A is cross-sectional area, v is velocity

8. Manning's Equation

v = (1/n) * R^(2/3) * S^(1/2)

Where v is velocity, n is Manning's roughness coefficient, R is hydraulic radius, S is slope

9. Darcy-Weisbach Equation

hf = f * (L/D) * (v/2g)

Where hf is head loss, f is friction factor, L is pipe length, D is pipe diameter, v is fluid velocity, g is acceleration due to gravity

10. Concrete Mix Design Ratio

C : FA : CA : W

Where C is cement, FA is fine aggregate, CA is coarse aggregate, W is water