Describe the characteristics of drilling methods that are commonly used for geotechnical assessments on land and in marine environments. In your answer you should describe: a) the drilling process, b) the materials that can be drilled, b) the nature of the sample that is retrieved, c) the typical depth of investigation, d) the relative merits of each technique that you recommend.

1. Wastewater of 30ft³/s with a biochemical oxygen demand (BOD) of 55mg/l, and dissolved oxygen (DO) of 3.3mg/l enters a river where the flow is 125ft³/s with an ultimate BOD of 7.0 mg/l, and DO of 6.8mg/l. The downstream has an average velocity of 0.8ft/s.

i           Calculate the minimum DO level and its distance in miles downstream using the oxygen sag equation. Assume k₁ = 0.046 per day and k₂ = 0.304 per day. The saturation DO = 8.5mg/l. (1 mile = 5280ft)

ii          At what distance downstream would the DO level of the river be equal to 6.10 mg/l?

iii      How much should the wastewater DO be increased to maintain a minimum DO of 4.8mg/l anywhere along the river. Assuming that the BOD of the wastewater and the river flow remains the same?

Discuss ( decentralized natural water treatment plant in an urban setting in Oman).

A rectangular channel of bottom width B = 7 m carries an average discharge of Q = 8 m³/s. There are two successive long reaches. The first reach has s₀₁=0.015 and n₁=0.010; and the second reach has s₀₂=0.0017 and n₂=0.021. Classify the slopes.

a) Explain differential movement and prevention in brick and concrete masonry. Where the control joints are must be located.

b) A 150 –ft exterior clay brick wall is designed for ½ -in expansion joints and a joint compressibility of 40 %. Determine the maximum joint spacing and the minimum number of joints required for entire wall. (Wall is going to be built in Lubbock TX. Temperature difference can be taken as 80ºF. Annual mean relative humidity is moderate 75>AMRH>50)

An ascending grade of 4% and a descending grade of 2% intersect at STA 12+598 whose elevation is at 518.99m. The two grades are to be connected by a parabolic curve, 160 long. Find the elevation of the first quarter point on the tangent and the summit of the curve.

a.)Determine the elevation of the summit.

b.)Determine the station of the summit.

c.)Determine the elevation of the first quarter point on the tangent.

d.)Determine the elevation of the midpoint on the curve.

Please type your answer and make it too short answer just type it.

1- When do I need to check for deflections in a reinforced concrete member?

2- What is the difference between short term and long term deflections?

3- How does ACI estimate the long term deflections in a member?

A shaft carries three masses A,B and C. Planes B and C are 60cm and 120cm from A. A, B and C are 50kg, 40kg and 60kg respectively at a radius of 2.5cm each. The angular position of mass B and mass C with A are 90° and 210° respectively. Find the unbalanced force and couple(Use A as reference plane). Also find the position and magnitude of balancing masses required at 10cm radius in planes L and M midway between A and B, and B and C(Use L as reference plane).

what and how usually project manager, developer and contractor discuss about a project's drawing. what the common problems in the drawing and how they solve it.

(a) Discuss the role of an efficient public transport system in the economic
development of a region.
(b) Discuss the quality of a public transport system as expected by the users.

A stone is thrown vertically up from the top of a tower with a certain initial velocity. It reaches ground in t seconds .(7.65). A second stone, thrown down from the same tower with the same initial velocity reaches ground in 3.6 seconds. Determine (i) the height of the tower, and (ii) the initial velocity of the stones.                         

A community living on an island off the west coast of Scotland is interested in meeting its electricity needs using marine renewable energy. Critique the standard approach for assessing the resource potential of wave power around the island, as included in the course notes. Include in your answer the main assumptions of the approach, its limitations and suggestions for improving its accuracy. [

a) You have recently graduated and been employed as an assistant site engineer on an open-cut mine. Your supervisor asks you to assist with modernising some mine operations. In particular, you are asked to investigate how modern surveying and spatial science technologies might be used to improve management of the mine.

Describe four applications of modern surveying technologies that might improve mine management. For each of these: describe the application, identify and describe the surveying and spatial sciences technology that could be used, and explain their likely advantages and disadvantages.

b) You are working with a large mining company. On site there are a number of stockpiles. Some measure approximately 30 x 30 metres and are approximately 5 metres high; several others are larger, measuring approximately 80 x 30 metres and are over 10 metres high.

Your company needs to measure the volume of the stockpiles at the end of each month. You have been asked to investigate options for measuring the stockpiles.

List and describe the surveying technologies that could be applied to this problem. For each option, indicate how it would be used, and list its likely advantages and disadvantages.