Cone of Depression – determini

ng the maximum pumping rate fo

r a specified draw down.

(+20)

A consulting company decides to u

se Pump & Treat to remove the

TCE plume from the aquifer. For an

unconfined aquifer such as this, t

here is a possibility that dr

awdown during the Pump & Treat operation will

lower the water table to the

bottom of the well and that the wa

ter will stop flowing (thi

s is bad). Suppose a 6

inch diameter well is installed

which fully penetrates the 15-m

thick aquifer which has a hydraulic

conductivity of 0.001 m/s. Deter

mine the maximum pumping rate

(in gallons per minute, gpm) that can be

sustained indefinitely if the dr

awdown at an observation well 5

00 m from the pumped well is 12 m and the

drawdown at the pumped well is

limited by the depth of the aqui

fer and the height of the submersible pump,

which you may estimate at 0.3 m

(i.e., drawdown in the pumping

well may not exceed 14.7 m).

Answer: Q = 50.5 gpm.

Usually, for a given slump, the cement and water demand will _________ as the maximum size of coarse aggregates decrease.
A. increase                B. decrease                  C. not change

Compare between curve A and B in the particle size distribution figure shown below, which one represents a well-graded aggregate? Your answer is _________.

What are the major similarities and differences between pozzolanic and hydraulic reactions for cementitious materials? (2 points)

Please explain why the impermeability and chemical corrosion resistance of the concrete are improved by using supplemental cementitious materials?

Identify and discuss the factors that can cause polls results to be wrong.​

Assessment 5.0: Ensuring fitness for purpose of the signalling system 5.1 Produce a report (300 words min) that explains how the sequential stages of installation, testing and commissioning of a new signalling system ensure it is fit for purpose. Your report should focus on the individual stages and the competence and equipment required and how the results of activities are recorded to be passed on to the next stages.

5.2 Produce a report (300 words min) that describes the need for maintenance, maintenance cycles and consequences of failure if maintenance is not carried out correctly

Search the Internet to explain the foundation isolation against frost action.

Do you think flying blimps are safe?

Hazardous wastes exist in the household in the form of common products used every day. Identify 4 products in your home that meet one of the 4 characteristics for hazardous waste (one product for Ignitability, one for Corrosivity, one for Reactivity, and one for Toxicity). For example, a can of hairspray is ignitable. Describe each product (what it is, the manufacture or producer, what it’s used for, and how it meets the characteristic of hazardous waste by identifying the component or chemical compound responsible). Describe the proper mode of disposal if the product could not be disposed in the household trash and where in the local area disposal of the product would be accepted. Collect the label from each product and attach to the assignment (if unable to remove the label, a picture is acceptable).

For a residential building with 5000W of heating demand, estimate:

a)     the number of required vertical ground heat exchangers (borehole heat exchangers) to fulfill the heating demand (round up the number).

b)    the heat exchange rate for each ground heat exchanger if boreholes are 30m deep (W/m).

Design parameters and assumptions:

The circulating fluid in the pipes is water with a temperature difference of 5°C between inlet and outlet pipes (T_out - T_in= 5°C) and Reynolds number of 5,000. Pipe outer diameter is 25mm with 1.8mm wall thickness. Circulating fluid density is 1000 kg/m³, the heat capacity is 4180 J/(kgK) and dynamic viscosity of 0.001 Pa.s.

A long footing supports a wall carrying a load of 260 kN per m. The soil at the
site is saturated clay having a undrained shear strength of 117 kPa. The unit
weight of the clay is 22 kN/m³ and it is suspected that occasionally the water
table rises to the ground surface. What width in m (1 dp) of footing should be
used if a minimum factor of safety of 2.4 is required? The footing depth is 1.2 m

For a trapezoidal-shaped, concrete-finished gravel bottom channel along a 0.5% slope, with a bottom width of 8 feet, a top width of 32 feet, and side slopes of 4:1, calculate:
a. the channel’s full capacity discharge,
b. velocity at full capacity discharge, and
c. discharge and velocity when stream flow is 0.5 feet from the top of the channel.

A prototype torpedo 6m long travels at 35 knots well below the ocean surface at 20°C. A model is to be tested in a wind tunnel 15°C air. What should the velocity, in m/s, of the model be avoid compression effects?

In a soil investigation for a construction project, two soil types were identified with the following parameters (g = 9.81 m/s²):

If the ground water level is at 2.5 m below the ground level, and the initial void ratio of the overconsolidated clay layer is 0.69, find the expected settlement in the clay layer only due to a proposed foundation that should imposes a pressure of 60 kN/m² on the mid-depth of the clay layer. The overconsolidation pressure is 125 kN/m². What is the the total settlement due to both the sand and clay layers (to the mid-height of the clay layer)?

Could someone give me an example of how to find net uplift wind pressure on a wall or gable roof?