How do i find darcy factor for this problem? Please show detailed steps.

I know e/d=k for relative roughness. How do i use this to find lambda or f for the darcy factor?

Water flows from point 1 of a large open tank, through a new cast iron pipe. The pipe has a diameter of 12 in and 5500 ft in length, Point 2 is the discharge point to the atmosphere and is 250 feet below the tank level. The pipe entrance has a sharp comer. Calculate the volumetric flow rate. Hints: 1. For water, p=62.41b/ft 2. For water, plp=1.082 x 10-5 f145. 3. For cast iron pipe, k=0.00085 ft. 4. The entrance loss coefficient is K=0.45 Point 1 Point 2 Water flows from point 1 of a large open tank, through a new cast iron pipe. The pipe has a diameter of 12 in and 5500 ft in length, Point 2 is the discharge point to the atmosphere and is 250 feet below the tank level. The pipe entrance has a sharp corner. Calculate the volumetric flow rate. Notes: 1. For water, p=62.4 lb/T13 2. For water, w/p=1.082 x 10-6%. 3. For cast iron pipe, k=0.00085 ft 4. The entrance loss coefficient is K=0.45 Point 1 Point 2