Problem 3.24 (page 119): The soil in a watershed has the following properties: 0, = 0.02, 0fe= 0.25,and 0 = 0.38. The watershed has a composite ARC II curve number of CN 80. A storm with arainfall of 30 mm occurs in dormant season. During the five days before the storm begins, the totalrainfall is 25 mm. Estimate the direct runoff from this storm using the MORE and SCS-CN models.%3D%3D%3D

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Answered: Problem 3.24 (page 119): The soil in a…

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter7: Seepage

Section: Chapter Questions

Problem 7.6P

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A 400 ha watershed has predominantly black cotton soil and its CN value is estimated as 73. Estimate the runoff volume due to two consecutive days of rainfall as follows: Day Rainfall (mm) Day 2 80 Day 1 65 The AMC can be assumed to be Type III.
Problem 4.3. By rational method, determine the design peak runoff for a 50-year return period. The watershed consists of 50-ha (120-ac), one third in rotation meadow and the remainder on row crops on the contour. The hydrologic soil group is B and the time of concentration is 30 min. The watershed is at your present location.
Question A 4-hour rainfall in a catchment of 250 km² produces rainfall depths of 6.2 cm and 5 ❤ cm in successive 2-hour unit periods. Assuming the index of the soil to be 1.2 cm/hour, the runoff volume is A 1.6 ha-m B D 16 ha-m 160 ha-m 1600 ha-m
Example 3 * In a 350 ha catchment the CN value was assessed as 70 for AMC-III. (a) Estimate the value of direct runoff volume for the following 4 days of rainfall. The AMC on July 1st was category II. Use standard SCS-CN equation Date July 1 July 2 July 3 July 4 Rainfall (mm) 50 20 30 18 (b) What would be the runoff volume if the CN value were 80? 41
A 200-hectare watershed is slated for commercial and business development. Currently the watershed is open space (good condition) with 35% B-soils and 65% D- soils. a) Find the CN for the soil before and after development b) Find the weighted CN (include the equation and calculation, c) Determine the increase in runoff depth from a 10 cm rainfall event due to developing the watershed 3.
A culvert is designed to pass a 50-year storm runoff, and it is designed for a 40 year life. What is the hydrologic risk of failure during the 40-year project life? A.2% B.55% C.64% D.82%
2) Compute the peak runoff, qp, using the NRCS Methbd for a 100 year storm for a drainage basin located near Atlanta, Georgia, and having the following parameters: Am 1.413 s.m. CN = 68.0 tc = 2.35 hours
3. The figure below shows 5 different isohyets in a watershed. Find the average rainfall using the isohyetal method Given: The left-most side area (Zone A) can be assumed to receive a rainfall of 1 cm. The area between the isohyets are given in the following table: A Zone A B C D E F B 1 cm D E 1.5 cm 4 cm Area (km²) 80 75 95 82 68 5 2.5 cm 3.5 cm
Determine the peak runoff (Nearest whole number) from a 100-year storm for the watershed described below: Field 1: 192 acres, 2% slope, cultivated, sandy soil Field 2: 38 acres, 8% slope, pasture, tight clay soil Field 3: 40 acres, 11% slope, woodland, silt soil The drainage way is 4000 feet with a 0.1% slope.
A local municipality is tasked with managing the sediment from its three streams originating from three different catchments. The sediment generated for each catchment is shown below as well as the annual stream runoff for each catchment. The municipality would like to install a sedimentation pond downstream of all three catchmentsthat requires cleaning every three months. Assuming that all the sediment settles in the pond, determine the size of the pond (in m3) making provision for an additional 10% of sediment in the event of flooding. The density of the sediment is 1.2 tons/m3
A tannery with a wastewater flow of 0.011 m½ and a BOD; of 590 mg/L discharges into a creek. The creek has a 10-year, 7-day low flow of 1.7 m^3/s. Upstream of the tannery, the BOD5 of the creek is 0.65 mg/L. The BOD rate constant k is 0.115 d-^1for the tannery and 3.7 d-^1 for the creek. The temperature of both the creek and the tannery is 20°C. Calculate the initial ultimate BOD after mixing.
PROBLEM 2: Using the cumulative rainfall hyetograph given below for a 150-km2 watershed, determine the abstractions and the excess rainfall hyetograph using Horton's equation with fo = 40 mm/h, fe = 10 mm/h, and k = 2 h-1. Assume that an interception storage of 10 mm is satisfied before infiltration begins. Also, determine the depth and volume of excess rainfall and its duration. Time (h) 1 2 3 4 5 6 Cumulative rainfall (mm) 25 70 115 140 160 180

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