Determine the groundwater infiltration rate for a new four-lane pavement with the following characteristics: 16-22 Lane width = 3.6 m Shoulder width = 3 m Length of contributing transverse cracks (W) = 12 m Rate of infiltration (K) = 0.015 m³lday/m? Spacing of transverse cracks = 12 m

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Solve the problem 16-22 in the image given.

Gilll 4G1lll s S
13:37
* Ye 4G2 42%
Vol
LTE
768885 - 16th...
Copyright 2021 Cengage Leaming. AI Rights Reserved May not be copied scanned, or duplicated, in whole or in part without explicit permission. July 2020. WCN 03-300-324
C 0 Conpam AR Rnal Me nep tdplt i pa D int at paty c he ed tte edad ap
Earial reviow ha danadita yppeda ly aanalingoperina. C Lanig mnen adla yitq rigta ricqai
Chapter 16 Highway Drainage
915
Determine whether a 1.5 m x 1.5 m reinforced concrete box culvert with 45° flared wing-
walls and beveled edge at top of inlet carrying a 50-year flow rate of 5.4 m³/s will operate
under inlet or outlet control for the following conditions. Assume k, = 0.5.
16-19
Design headwater elevation (EL) = 31.5 m
Elevation of stream bed at face of invert = 29.87 m
Tailwater depth = 1.43 m
Approximate length of culvert = 60 m
Slope of stream - 1.5%
n- 0.012
Repeat Problem 16-19 using a 1.95 m diameter circular pipe culvert with k, = 0.5.
Determine the ground water infiltration rate for a new two-lane pavement with the
following characteristics:
16-20
16-21
Lane width = 3.6 m
Shoulder width = 3 m
Length of contributing transverse cracks (W) = 6 m
Rate of infiltration (K) = 0.015 m/day/m²
Spacing of transverse cracks = 9 m
Determine the groundwater infiltration rate for a new four-lane pavement with the
following characteristics:
16-22
Lane width = 3.6 m
Shoulder width = 3 m
Length of contributing transverse cracks (w) = 12 m
Rate of infiltration (K) = 0.015 m³/day/m
Spacing of transverse cracks = 12 m
In addition to the infiltration determined in Problem 16-21, groundwater seepage due
16-23
to gravity also occurs. Determine the thickness of a suitable drainage layer required to
transmit the net inflow to a suitable outlet.
Thickness of subgrade below drainage pipe = 3.6 m (12 feet)
Coefficient of permeability of native soil = 0.105 m/day (0.35 ft/day)
Height of water table above impervious layer = 6.3 m (21 feet)
Slope of drainage layer = 2%
Permeability of drainage area = 600 m/day (2000 ft/day)
Length of flow path = 18 m (60 ft)
REFERENCES
Brown, S. A., S. M. Stein, and J. C. Warner, Urban Drainage Design Manual. Hydraulic
Engineering Circular No. 22, 2nd ed., U.S. Department of Transportation, Federal
Highway Administration Publication No. FHWA-NHI-01-021, Washington, D.C.,
2001.
Brown, S. A J.D. SchalL. J. L. Morris. C. L. Doherty. S. M. Stein, and I. C Warner.
Transcribed Image Text:Gilll 4G1lll s S 13:37 * Ye 4G2 42% Vol LTE 768885 - 16th... Copyright 2021 Cengage Leaming. AI Rights Reserved May not be copied scanned, or duplicated, in whole or in part without explicit permission. July 2020. WCN 03-300-324 C 0 Conpam AR Rnal Me nep tdplt i pa D int at paty c he ed tte edad ap Earial reviow ha danadita yppeda ly aanalingoperina. C Lanig mnen adla yitq rigta ricqai Chapter 16 Highway Drainage 915 Determine whether a 1.5 m x 1.5 m reinforced concrete box culvert with 45° flared wing- walls and beveled edge at top of inlet carrying a 50-year flow rate of 5.4 m³/s will operate under inlet or outlet control for the following conditions. Assume k, = 0.5. 16-19 Design headwater elevation (EL) = 31.5 m Elevation of stream bed at face of invert = 29.87 m Tailwater depth = 1.43 m Approximate length of culvert = 60 m Slope of stream - 1.5% n- 0.012 Repeat Problem 16-19 using a 1.95 m diameter circular pipe culvert with k, = 0.5. Determine the ground water infiltration rate for a new two-lane pavement with the following characteristics: 16-20 16-21 Lane width = 3.6 m Shoulder width = 3 m Length of contributing transverse cracks (W) = 6 m Rate of infiltration (K) = 0.015 m/day/m² Spacing of transverse cracks = 9 m Determine the groundwater infiltration rate for a new four-lane pavement with the following characteristics: 16-22 Lane width = 3.6 m Shoulder width = 3 m Length of contributing transverse cracks (w) = 12 m Rate of infiltration (K) = 0.015 m³/day/m Spacing of transverse cracks = 12 m In addition to the infiltration determined in Problem 16-21, groundwater seepage due 16-23 to gravity also occurs. Determine the thickness of a suitable drainage layer required to transmit the net inflow to a suitable outlet. Thickness of subgrade below drainage pipe = 3.6 m (12 feet) Coefficient of permeability of native soil = 0.105 m/day (0.35 ft/day) Height of water table above impervious layer = 6.3 m (21 feet) Slope of drainage layer = 2% Permeability of drainage area = 600 m/day (2000 ft/day) Length of flow path = 18 m (60 ft) REFERENCES Brown, S. A., S. M. Stein, and J. C. Warner, Urban Drainage Design Manual. Hydraulic Engineering Circular No. 22, 2nd ed., U.S. Department of Transportation, Federal Highway Administration Publication No. FHWA-NHI-01-021, Washington, D.C., 2001. Brown, S. A J.D. SchalL. J. L. Morris. C. L. Doherty. S. M. Stein, and I. C Warner.
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