Sheet pile 5 m 1.67 m Ground surface 0 I C Ш 10 m а 5 id 4 3 2

4.- A retaining wall with a vertical back is 8 m high. The volumetric weight of the 3 m fill surfaces is y = 1.75 ton/m3 and the angle of resistance is $ = 30°; for the 5m remaining fill the values are y = 1.85 ton/m3 and angle of internal friction = 35°. Also there is an overload on the horizontal surface of the landfill equivalent to 1.2 ton/m2, Evenly distributed. Find the magnitude and point of application of the thrust per meter of Wall. A) If the fill is well drained B) If the fill becomes saturated after a storm (assume for this case that the weights saturated values of the two strata are 1.9 and 2.0 ton/m3 respectively) q= 1.2 ton/m2 ↓↓↓↓ Y = 1.75 ton/m3 $ = 30° Y $ = 35° 1.85 ton/m3 H1 = 3.0 m H2 = 5.0 m

3.3 Three grit chambers are currently used to treat grits in a WWTP. Each channel is 2.5 ft wide and has a water depth of 2 ft. What is the velocity when the influent flow rate is 12 ft³/sec? a) 1.75 ft/sec b) 0.74 ft/sec c) 1.05 ft/sec d) 0.80 ft/sec 3.4 You performed settling test and found 600 mL settled after 30 min. If the MLSS in the aeration basin was 3000 mg/L, do you have problem? a) yes b) no c) no enough info. d) need to redo test

The time required to reach 60% consolidation for a sample of 1 cm thick in odometer under condition of double drainge was found to be 35 sec. The time for a layer of 10 m thick to reach the same consolidation degree if drainage in one side. Negative rating for wrong answers