The relation between the scour depth (R) and Regime scour depth (Rₑ) for an alluvial river having regime width (W) and contracted width (B) is given by ______

• A. R = Rₑ (W/B)^0.61
• B. R = Rₑ (B/W)^0.61
• C. R = Rₑ (W/B)^0.33
• D. R = Rₑ (W/B)^0.33