Explain what is meant by "Rigid Perimeter" in high buildings and when is it used?

An irrigation canal with trapezoidal cross-section has the following elements: bottom width = 2m, depth of water = 0.9m, side slope 1.5H to 1V, slope of canal bed = 0.001, n = 0.025. The canal will serve clay-loam rice land.

What is the hydraulic radius in meters?

What is the mean velocity in m/s?

If the canal will serve a clay-load rice land, determine the area in hectares it can serve if the duty of water per hectare is 3L/s.

A rectangular channel 6m wide by 1m deep is lain on slope of 0.001 and has roughness coefficient of n = 0.013.

What is the mean velocity of flow (m/s) when the canal is full?

What is the maximum capacity of the channel in m³/s?

If the most efficient rectangular section is used, what depth of canal is required for the same discharge, slope, and roughness coefficient?

A trapezoidal concrete dam (s = 2.4) 8.1m high and a horizontal base 10m long has a vertical upstream side. The downstream face is sloping 2-horizontal to 3-vertical. Water stands 7m on one side.

Compute for the total weight of the dam.

What is the overturning moment?

Where will the resultant force cut the base from the toe?

Problem 1: Four design alternatives were proposed. Each design alternative has unique costs and benefits. Given the information for the four mutually exclusive in the table below, recommend the best alternative using the incremental B/C ratio analysis method knowing that the MARR is 6%. (Use the PW in your calculation)

Alternative 1 2 3 4
Capital investment cost $ 12500 11000 12500 16800
Annual operating and maintenance cost $ 120 480 450 140
Annual utility savings $ 580 700 950 1300
Annual revenue $ 700 550 200 250
Annual other benefit $ 400 750 150 500
Project life in years 40 40 40 40

What are the objectives of the storm sewer system design?

As regarding the concrete lab, you will be required to fabricate 6 standard concrete
cubes (100 mm) for compression testing.
Mass ratios:
Mix 1 (30 MPa) – 1:2:4 with w/c = 0.6
Specific gravity of materials:
Cement: 3.15
Fine and coarse aggregate: 2.60

Calculate the Quantity of material?

10) LIST AT LEAST 3 CONCRETE ADMIXTURES THAT HAVE BEEN DEVELOPED IN THIS CENTURY (2000-2020), AND EXPLAIN:

a) Use or Application

b) Typical Dosage

c) Advantages

d) Disadvantages

type please

A 40 m long concrete box culvert (n = 0.012) will be laid on a slope S =
0.001. The inlet will have a headwall parallel the embankment and the
entrance will be beveled on three sides. What should be the width, b, of
the culvert if D = 1 m TW = 1.1 m, Q = 1.8 m3/s, and the HW < 3.0 m.
Assume that the outlet creates the maximum headwater for your solution.

A circular concrete culvert has a diameter D = 4 ft, bottom slope S = 0.01,
and length L = 100 ft. The culvert inlet is grooved with a headwall and is
not mitered. Determine the maximum discharge this culvert can convey
under inlet control conditions if the headwater depth, HW, is not to exceed
6.0 ft.

1. The ordinates of a 6- hr unit hydrograph are given below. A storm had three successive 6 – hr intervals of rainfall magnitude of 3, 5, and 4 cm respectively. Assuming a Φ- index of 0.2 cm/hr and a base flow of 30 m³/s, determine the resulting hydrograph of flow (total flow).

A mass balance is performed for a treatment process consisting of a sedimentation tank followed by a mixing tank. First, 25097 m3/d of raw wastewater with solids concentration of 180 mg/l flows into the sedimentation tank. 97% of the incoming solids end up in the sludge. The effluent flows at a rate of 1040 m3/hr. Next, the effluent of the sedimentation tank enters the mixing tank where it is mixed with pure filtered water. Assume that the density is the same for all streams. Calculate the following: a) Flow (m3/d) of the sludge in the sedimentation tank. b) Solids concentration (mg/l) of the effluent in the sedimentation tank. c) Flow (m3/d) of the pure filtered water, knowing that that the final effluent of the mixing tank will be used in irrigation with a ma ximum solids concentration of 97 mg/l.

If 197 mg of HCL is added to 1 L of solution with a pH of 3, what is the final pH? HCL ↔ H+ + CL-

8. (a) Classify the quadric surface 4? 2 − ? + 2? 2 = 0. [4 points]

(b) Find the traces of the above surface in xy, xz, yz-plane respectively. [6 points]