6. Show the 50-year, constant-intensity design storm for a watershed in Baltimore with a time of concentration of 30 minutes. Also show the 10-year, 15-min, constant-intensity design storm for a watershed in Baltimore. Baltimore, Maryland 1903-1951 200 15.0 Note Frequency analysis by method of [extreme value after gumbel 10.0 8.0 6.0 Return period (years) 4.0 10 2.0

6. Show the 50-year, constant-intensity design storm for a watershed in Baltimore with a time of concentration of 30 minutes. Also show the 10-year, 15-min, constant-intensity design storm for a watershed in Baltimore. Baltimore, Maryland 1903-1951 200 15.0 Note Frequency analysis by method of [extreme value after gumbel 10.0 8.0 6.0 Return period (years) 4.0 10 2.0

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter16: Highway Drainage

Section: Chapter Questions

Problem 4P

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Plot the hyetograph of 20 min for this storm event over a specified watershed using the rainfall data given in the Table Q1. Indicate what is the storm duration and the total quantity of rainfall over this catchment area. 12:00 11:40 11:20 11:00 10:40 10:20 10:00 Time (hr) 107 107 82 57 32 16 0 Rainfall in successive intervals (mm)
Hydrology Problem: Develop a synthetic rainfall hyetograph for a 6 hr, 10-year rainfall event for Houston, TX using a time step of 30 min. Arrange to be an early peaking event.
Question 1 10 points Save Answe A portion of a housing development in shown in the layout below. The maximum velocities of flow in both sewers A and B were determined to be 1 m/s. The rainfall intensity-duration relationship for the 5-year 24 hour storm is where i = intensity (mm/s) and t =duration (minutes) (t+20) Housing Area Park Area Housing Area A - 1.2 ha A - 1.2 ha A- 2.5 ha C - 0.45 C - 0.15 C - 0.45 Inlet time- 5.0 min Inlet time - 6.0 min Inlet time-8 min MH1 МН 2 MH 3 180 m Sewer B 180 m Sewer A Sewer C Given: Q= 10xCxixA; (Rational Method Equation) Where Q = Flow (m³is); i = intensity (mm/s); A = area (ha) A) Calculate the maximum (design) flow Qmax (in L/s) for sewer C using the Rational Method. B) Design sewer C (Diameter; Slope) for 5-year 24 hour storm. Assume sewer running full at maximum flow (dmax/D = 1) and ensure that Vf is between 0.8 - 2.4 m/s. Calculate velocity (Vmax). and deoth of flow (dmax) at maximum (design) flow. Assume nf = 0.013 and variable with depth.
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