Determine the surface area of a settling tank for the city of Urbana's 0.9m3/s design flow using the design overflow rate found in Example 423(V0=32.5m/d),(t0=95min). Compare this surface area with that which results from assuming a typical overflow rate of 20m3/dm2. Find the dimensions (depth, length, width) of the clarifier for the overflow rate and detention time for (N0=32.5m/d),(t0=95min) Given: L:W ratio is between 2:1 and 5:1 Assuming 4 tanks, each with 12m width Sludge Zone depth 1m