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Compute the minimum distances from the shoreline at which the diffuser pipe should be located if the water quality criterion requires that the maximum
Compute the minimum distances from the shoreline at which the diffuser pipe should be located if the water quality criterion requires that the maximum allowable coliform concentration at a coastal band of x=350 m. width is 1000 bacteria/100 ml. DATA TO BE USED: Total waste water discharge: Waste water density: Sea water density: a)p-1028 kg/m' (uniform) b)p-1027 kg/m at surface (uniformly increases with 0.03 kg/m per meter of water column) Initial Pollutant Concentration, Co: Q-1.5 m'/sec. Po-998 kg/m two options 10 Bacteria/100 ml. D,-20 cm. n-23 Port diameter: Number of ports: Distance between ports: Current Speed (perpendicular to coast): T9o: -water depth)/6. (alternating on both sides) U=11 cm/sec 1.5 hr. a) 1/10 b) 1/50 Slope of sea bottom: IMPORTANT STEPS IN COMPUTATIONS: 1. Assume a perpendicular distance from the shoreline (X) at which the diffuser should be located (as the first assumption, you can take X-1300 m.). 2. Using bottom slope, calculate the water depth and other depth related parameters. 3. Check whether trapping occurs or not. If pollutant cloud is trapped, calculate trapping height (Zr). 4. Calculate the centerline dilution (Sm) and pollutant concentration (Cmi-C Sml) at the end of near field dilution. 5. At the end of near field, far field dilution starts. Calculate far field dilution(Sm2) including decay(Sm3). For far field dilution computations consider the distance from the location of diffuser to the coastal band of 350 m. (i.e. Xassumed-350 m.). 6. Check whether the total dilution (near field dilution far field dilution including decay-Sr Smi* Sm2* Smi) satisfies the required dilution (Sr-10 bac/ml-10 bac/ml= 10 bac/ml) or not. If it is not satisfied, repeat the calculations by increasing or decreasing the horizontal distance (X), at which diffuser should be located (you can choose horizontal distance increments as Ax-50m). 7. Once you get the horizontal distances Xi satisfying total dilution ST < 10 bac/ml and X-1 satisfying total dilution ST > 10 bac/ml at the coastal band of 350 m., you can perform interpolation to find the exact location of diffuser pipe (distance X and water depth).
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