The surface water from airport road side is drained to the longitudinal side drain from across one half of a bituminous pavement surface of total width 7.0 m, shoulder and adjoining land of width 8.0 m on one side of the drain. On the other side of the drain, water flows across from reserve land with average turf and 2% cross slope towards the side drain, the width of this strip of land being 25 m. The inlet time may be assumed to be 10 min. for these conditions. The runoff coefficients of the pavement, shoulder and reserve land with turf are 0.8, 0.25 and 0.35 respectively. The length of the stretch of land parallel to the road from where the water is expected to flow to the side drain is 400 m. Estimate the quantity of runoff flowing in the drain assuming 10 year frequency. The side drain will pass through clayey soil with allowable velocity of flow as 1.33 m/s. Intensity-duration chart for 10 year frequency is: Duration (minutes) 5 10 15 20 30 Intensity (mm/hr) 160 150 125 110 95

The surface water from airport road side is drained to the longitudinal side drain from across one half of a bituminous pavement surface of total width 7.0 m, shoulder and adjoining land of width 8.0 m on one side of the drain. On the other side of the drain, water flows across from reserve land with average turf and 2% cross slope towards the side drain, the width of this strip of land being 25 m. The inlet time may be assumed to be 10 min. for these conditions. The runoff coefficients of the pavement, shoulder and reserve land with turf are 0.8, 0.25 and 0.35 respectively. The length of the stretch of land parallel to the road from where the water is expected to flow to the side drain is 400 m. Estimate the quantity of runoff flowing in the drain assuming 10 year frequency. The side drain will pass through clayey soil with allowable velocity of flow as 1.33 m/s. Intensity-duration chart for 10 year frequency is: Duration (minutes) 5 10 15 20 30 Intensity (mm/hr) 160 150 125 110 95

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Highway Drainage

Highway drainage is the process of extracting and regulating the excess surface water on the pavement by giving the desired slope. The construction of a highway drain helps to divert the water present on the surface, and sub-grade by the means of slope. Highway drainage systems are a necessary part of smooth functioning of traffic, since the highway drainage systems provide proper disposal of unwanted substances from the highways.

Question

The surface water from airport road side is drained to the longitudinal side drain from across one half
of a bituminous pavement surface of total width 7.0 m, shoulder and adjoining land of width 8.0 m on
one side of the drain. On the other side of the drain, water flows across from reserve land with
average turf and 2% cross slope towards the side drain, the width of this strip of land being 25 m. The
inlet time may be assumed to be 10 min. for these conditions. The runoff coefficients of the pavement,
shoulder and reserve land with turf are 0.8, 0.25 and 0.35 respectively. The length of the stretch of
land parallel to the road from where the water is expected to flow to the side drain is 400 m. Estimate
the quantity of runoff flowing in the drain assuming 10 year frequency. The side drain will pass
through clayey soil with allowable velocity of flow as 1.33 m/s. Intensity-duration chart for 10 year
frequency is:
Duration (minutes) 5 10 15 20 30
Intensity (mm/hr) 160 150 125 110 95

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