A Waste water treatment units is proposed to be designed for the Wilayat of Sur. Population of Sur is 200,000 and an average sewage generation is 210 liter per capita per day. Design an appropriate waste water treatment plant using the following given data. If needed assume other necessary data.

Approach channel velocity = 42 m/min, d = 1.5 w Design three aerated grit chamber Detention time in grit chamber = 3 min Depth of aerated grit chamber = 2.0 m Depth to width ratio in aerated grit chamber is 1:1.2 Total depth of primary clarifier = 3 m (Mechanical Sludge removal) Overflow rate = 20 m3/m2.d Detention time in the primary clarifier should be greater than 1.5 hours Secondary clarifier with a depth of water equal to 0.5 times the Length (Mechanical Sludge removal) Detention time in secondary clarifier = 2 hours

Design (size of the unit) the following units of the treatment process:

Rectangular Bar screen channel, Rectangular Aerated Grit chamber, Six Circular Primary Clarifier, and Six Square Secondary Sedimentation tank.

An unsymmetrical I section prestressed concrete beam of top flange (350 X 40 mm) in size, bottom flange of (200 X 40 mm), 30mm thickness of web and overall depth of 400 mm is prestressed with 19 numbers straight steel wires of 7 mm diameter located at a distance of 15 mm from the bottom of the soffit and 9 numbers of straight steel wires of 6 mm diameter located at a distance of 15 mm from the top of the beam. The wires were initially tensioned on the prestressing bed with an initial prestress of 1.2 GPa. The length of the beam is 10 m. Calculate the total percentage loss of stress in the wires at top and bottom. Assume the beam is post tensioned beam and all the wires stressed simultaneously by using the following data: [9] Relaxation of steel stress= 4.5% of initial stress -6 Shrinkage strain in concrete for post tensioning = 200 x 10 Creep Coefficient ɸ=1.6 Friction coefficient for wave effect=0.0015 per metre Slip at anchorage= 1.5 mm Modulus of elasticity for steel = 210 GPa Modulus of elasticity for concrete= 35 GPa

A room with inside dimensions of 5x7m is built from block 30x30x30 cm,
using cement sand mortar 1:2.5, the wall thickness is 30 cm.
The room wall height above the footing concrete is 5 m. The room has a
door of size 1.5x2m and a window 3x2m. The room is covered with a slab of
15 cm thick which has a 20 cm extension beyond the outside wall edges all
around. The slab is reinforced with 10 mm bars at 15 cm c/c in both
directions, one bar straight and one bar bent. Estimate:
1. Amount of steel needed for the slab in the short direction only.
2. Amount of blocks needed for construction.

Calculate the minimum prestressing force required for Beam 1 knowing that the beam has a cross sectional area of 200 × 500 mm and an allowable stress of 0.3 N/mm2 . External Load applied in Tons/m is 150

In ENGG3500

Question 1. “Identify 2 aspects of this course that you feel are the most important for future students enrolling in this course to form a clear and informed understanding..? (include your reasoning for why you feel these 2 aspects are the most important)

Question 2 : “How would you define the purposes of this course, without using the words Project Management, PMBOK, or Engineering in your response?

A 1200 mm deep by 750 mm wide post-tensioned simply supported beam is shown below. The beam spans 12.0 m and is subject to a superimposed dead load of 50 kN/m and a live load of 35 kN/m. Both the superimposed dead load and live load are applied after transfer (after stressing has taken place). The tendon is located at the mid-height of the beam at each end, and its centreline sits 50 mm from the base at midspan. The concrete strength at transfer is 22 MPa, and at maturity is 40 MPa. Assume Ec = 32800 MPa, γc = 24 kN/m3 and ignore any prestress losses.

Estimate the approximate total short-term and long-term deflection under the load combination G + 0.7Q. Assume Pi = 1750 kN and Фcc = 2.8.

5. The City of Maskeliya disposes of 2.15m3/s of treated sewage that still has a BODu of 32.0 mg/L and 2.2 mg/L of DO into a river. Upstream from the outfall, the river has a flow rate of 6.50m3/s and a velocity of 0.45 m/s. At this point, BODu and the DO in the river are 3.25 and 7.3 mg/L respectively. The saturation value od DO (at the temperature of the river) is 8.9 mg/L, The deoxygenation coefficient, kd , is 0.61 day-1, and the reaeration coefficient, kr , is 0.74 day-1 . Assume complete mixing and that the velocity in the river is the same upstream and downstream of the outfall (30 points) 1. What is the oxygen deficit and the BODu just downstream from the outfall (just after mixing, before any reaction can occur?) 2. What is the DO 12 km downstream? 3. Calculate the critical time and distance 4. What is the minimum DO

1. Select the lightest W shape to support a uniformly distributed load of 1600 lb/ft ona simple span of 48 ft. Deflection is not to exceed span/240. Assume a yield stress of 50 ksi. Allowable bending stress of 22,000 psi.

Define, explain and illustrate graphically where appropriate the following:
a. Parallel Parking
b. Angular Parking
c. Parking Turnover
d. Ramp Metering
e. Congestion Pricing

Tabulate station elevations (stakeout at full stations) for an equal-tangent vertical curve for the following data given. (20 pts) • 500-ft curve • g1 = -3.00% • g2 = -1.25% • VPI at station 38 + 00 and elevation 560.00 ft

Urbanization involves the growth of cities, flow of traffic, transportation assets, facilities and fixed infrastructure. Collectively, these factors play major roles in what has become to be known as a “four-stage” process of urbanization. Smooth traffic flow enhances to a significant extent the urbanization process in cities, and by implication, government activities and private enterprise. Based on your course readings and knowledge of the concept of urbanization, graphically illustrate the four-stage process typically associated with this phenomenon tagged “urbanization” detailing the essential factors from stage one to stage four.