Traffic And Highway Engineering
5th Edition
ISBN: 9781133605157
Author: Garber, Nicholas J., Hoel, Lester A.
Publisher: Cengage Learning,
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Chapter 20, Problem 24P
To determine
The steps involved in the MEPDG (Mechanistic-Empirical Pavement Design Guide
Manual of Practice) method for JPCP (Joint Plain Concrete Pavement)
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Determine the heel and toe stresses and the factor of safeties for sliding and
overturning for the gravity dam section shown in the figure below for the following
loading conditions:
- Horizontal earthquake (Kh) = 0.1
- Normal uplift pressure with gallery drain working
- Silt deposit up to 30 m height
- No wave pressure and no ice pressure
-Unit weight of concrete = 2.4 Ton/m³ and unit weight of silty water = 1.4 Ton/m³
- Submerged weight of silt = 0.9 Ton/m³
- Coefficient of friction = 0.65 and angle of repose = 25°
Solve this question with the presence of gallery and without gallery., discuss
the issue in both cases....
Draw and Solve in
table
4m
8m
6m 8m
7m
120m
Land Use
Hydrologic Area (acres)
Soil Group
A
25
Forestland-orchards
B
30
B
45
Forest Oak-Aspen
C
60
A
80
Open Spaces
B
65
A
120
Residential
(1/2-acre lots)
B
155
Storm Hyetograph
Time Rainfall
Interval Intensity
(hours) (in/hr)
0-1
1.2
1-2
1.3
2-3
1.9
3-4
1.5
4-5
1.3
5-6
1
6-7
0.8
1 Hour-Unit
Hydrograph
Time
UH
[hr]
[cfs/in]
0
0
1
60
2
120
3
140
4
80
5
40
6
10
7
0
Secondary Treatment
Based on a plant flow rate of 40 mgd, design an activated sludge, secondary treatment system with recycle which maintains a MLVSS = 2,000 mg/L in the aeration
reactor and has an average Solids Retention Time (SRT) = 4 days. The biota kinetic constants are:
Kinetic Coefficients for the Activated-sludge Process for the Removal of Organic
Matter from Domestic Wastewater
-
Endogenous Decay Coefficient – k(d)
Half-velocity constant – K(s)
0.1
15
Max. Specific Substrate Utilization Rate – k
Biomass Yield - Y
6
0.45
gVSS/gVSS-day
mg/L bsCOD
g bsCOD/gVSS-day
gVSS/g bsCOD used
The laboratory has provided the information below for your influent from your primary clarifier.
Unit
mg/L
Item
Influent nbVSS - Xo
Quantity
30
Fraction of the biomass which remains as cell debris (fd)
Temperature
0.18
20
°C
Quantity of Oxygen in air
0.017
Lb O₂/ft³ air
Influent microorganism & substrate concentration as (So)
Influent Inert Inorganics (TSS. – VSS.)
215
10
Mg/L bsCOD
mg/L
Aeration Basin…
Chapter 20 Solutions
Traffic And Highway Engineering
Ch. 20 - Portland cement concrete consists of what four...Ch. 20 - List and briefly describe the five main types of...Ch. 20 - What is the main requirement for the water used in...Ch. 20 - Prob. 4PCh. 20 - Prob. 5PCh. 20 - Prob. 6PCh. 20 - Prob. 7PCh. 20 - Prob. 8PCh. 20 - Prob. 9PCh. 20 - Prob. 10P
Ch. 20 - Prob. 11PCh. 20 - Prob. 12PCh. 20 - Repeat Problem 20-12, with the slab containing...Ch. 20 - Prob. 14PCh. 20 - Prob. 15PCh. 20 - Prob. 16PCh. 20 - Prob. 17PCh. 20 - Prob. 18PCh. 20 - An existing rural 4-lane highway is to be replaced...Ch. 20 - Prob. 20PCh. 20 - Prob. 21PCh. 20 - Prob. 22PCh. 20 - Prob. 23PCh. 20 - Prob. 24PCh. 20 - Prob. 25PCh. 20 - Prob. 26PCh. 20 - Prob. 27P
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