A 0.7 m sand filter media is used to treat water at a rate of 10 m/h. From sieve analysis, d10=0.53 mm, d30=0.67 mm. d50=0.73, d70=0.8 mm. and d90= 0.86 mm. Assume the grain sphericity is o= 0.75 and a porosity is 0.40. Estimate the head loss of the filter at 15C