Problem 4.2. Determine the peak rate of runoff from an 8-ha (20-ac) watershed during a 30-min stormthat gave the following amounts of rain during successive 5-min periods: 3, 8, 15, 15, 8, and3 mm (0.1, 0.3, 0.6, 0.6, 0.3, and 0.1 in). The time of concentration for the watershed is 10min. The runoff coefficients for the 2 ha (5 ac) are 0.2 and 0.6 for the remaining 6.0 ha (15ac). What is the approximate return period for this runoff if the watershed is at your presentlocation?

Solution: Area of catchment = 8 ha Effe run off coefficient = C1A1 + C2A2 A1 + A2 = 2 x 0.2 + 0.6 x…

Answered: Determine the peak rate of runoff from…

Engineering

Civil Engineering

Determine the peak rate of runoff from an 8-ha (20-ac) watershed during

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Related questions

Q: Overland flow process comes after? A- precipitation. B- runoff. C- runoff generation. D-…

A: given data: Overland flow process comes after? A- precipitation. B- runoff. C.runoff generation.…

Q: A 200-acre urban drainage area consists of three different watershed areas as follows: (i) 100-acre…

Q: Scenario: A new commercial development is planned in a 100-acre area with 85% imperviousness. To…

Q: 3. The average rainfall rate in a watershed with an area of 50 mi² in the upstate of South Carolina…

A: Given that, Watershed area = 50 square miles Average rainfall= 62 inches/year Average stream…

Q: What is the value of the 10-year ARI runoff coefficient (C10) of this catchmen

Q: Question 10) What is the runoff coefficient (C) for a watershed that is 60% covered by industrial…

A: The given data is: Area covered by industrial areas = 60% Area covered by lawns = 30% Area covered…

Q: O. Determine the mean runoff flow in cfs from a drainage area of 175 acres using the English…

A: Inglis formula is a empirical formula Where A is area in km^2 Q discharge in m^3/sec

Q: Q2) A watershed has the following land use: a- 300 ha of open forest land b- 500 ha of good pasture…

A: given data,a) 300ha of open forestb)500ha of good pasture land c)200ha of poor bunded cultivated…

Q: 8. Determine the peak runoff rate in Ashville, NC, for a 25-year storm of a 50-acre watershed with…

A: The area of the residential plot = 22 acresThe area of the apartments = 12 acresThe area of the lawn…

Q: The period of runoff for a 1-hour UH is given as T. The resulting period of runoff for a 2-hour UH…

A: T+1 To obtain 2hr Unit hydrograph 1hr uni hydrograph is added by delaying it by 1 hour

Q: Over a basin of area 333 km2, there was a storm for 6 h with a uniform intensity of 2 cm/h. The…

Q: A 6 hour storm has 6 cm of rainfall and the resulting runoff was 3 cm. if the index remains at the…

A: Given that :- Precipitation = P = 6 cm Run off = R = 3 cm Time = t = 6 hour If the φindex remains…

Q: For a watershed drainage area that is 80 acres with an elevation drop of 60 feet over a flow length…

A: The values given in the question are as follows watershed drainage area=80 acres Elevation…

Q: A 100 ha watershed received rainfall at a rate of 5 cm/hr for 2 hours. If the runoff generated by…

A: Given data- Area A=100 ha watershed, Rainfall rate = 5 cm/hr for 2 hours, Runoff is generated by 1…

Q: For a given storm of total rainfall depth of 10 cm at a given watershed, the total direct runoff…

A: Answer We are given total rainfall depth = 10 cm total direct runoff = 8 cm average rainfall…

Q: Question 1 A 3hr storm had 9cm of rainfall and the resulting direct runoff was 3.0 cm. If the -…

A: Given- 3 hr storm, 9 cm rainfall, runoff=3 cm

Q: A 400-acre watershed has the following characteristics: o 150 acres of forest with a Muskingum soil…

A: GIVEN- 150 acres of forest with Muskingum soil. 100 acres of forest with Shelocta soil. 25 acres…

Q: A watershed of area 90 ha has a runoff coefficient of 0.4. A storm of duration larger than the time…

Q: A 1-km² catchment with 3% pond area has a curve numb a 24-h Type I rainfall of 13 cm. Estimate the…

Q: A 100-acre watershed that is 80% Industrial and 20% newly graded areas (no vegetation). The…

Q: What is the peak flow from a watershed with 5 acres and runoff coefficient of 0.7, for a 10-year…

A: Peak flow = 0.529 cubic ft/secExplanation:

Q: of 100 mgd is to be obtained from a reservoir that is charged by runoff from a 190 mi² watershed.…

A: According to given data A flow of 100 mgd is to be obtained from a reservoir that is charged by…

Q: What would the runoff be if a 3 acre watershed got 10 in/hr rainfall and an average c coefficient of…

Q: Over a basin of area 300 km², there was a storm for 4 h with a uniform intensity of 4 cm/h. The…

A: Given Area A=300 km2 time t= 4hrs Intensity I=4 cm/h Runoff R= 40×106 m3

Q: A 6-h storm had 6 cm of rainfall and the resulting runoff was 3.0 cm. If the index remains at the…

Q: of a rainstorm of 8 cm gives the runoff of 4 cm in a catchment whose -index is fixed and for whole…

A: A rainstorm with,Total rainfall P=8 cm,Runoff R=4 cm,Duration of rainfall t=3 hrs,

Q: Rainfall of intensity 20 mm/h occurred over a watershed of area 1 km² for duration of six hours. It…

A: Given- Intensity of rainfall I=20 mm/hWater shed area A=1 km2duration t=6 hrsDirect runoff volume…

Q: Compare point and non-point sources of water pollution and give an example for each source.

Q: Use TR-55 graphical method to compute the peak discharge for a 250-ac watershed, with 25-y 24-h…

Q: A 4-hr storm had 4 cm of rainfall and the resulting direct runoff was 2.0 cm. If the -index remains…

A: Given- 4-hr storm 4 cm of rainfall Direct runoff=2 cm ϕ-index constant. It is needed to find the…

Q: If the average run-off depth i è maximum run-off depth in a Om long and 40m wide, the a gation…

A: Given:- average run off depth = 80% L=400mm b=40m Irrigation current =10m3/min irrigation depth =…

Q: A 220-acre watershed is comprised of 2 distinct areas: 40% cultivated, flat land- tight day 50%…

Q: (6) Assume the AMC at Day 1 to be of Type III. Use standard SCS-CN equations. A watershed has the…

A: Use Equation ; Q=P-0.252P+0.85 ......1CN=25400254+S .......2

Q: A 6-h stom had 6 cm of rainfall and the resulting runoff was 3.0 cm. If the g-index remains at the…

A: Appreciate if there is detailed work with explanation and finds you helpful for ease of…

Q: A 6-h storm had 6 cm of rainfall and the resulting runoff was 3.0 cm. If the pindex remains at the…

Q: A catchment consists of 30% area with runoff coefficient 0.40 with the remaining 70% area with…

Q: An urban water shed is composed of 9 ha of parkland (c=0.25), 2 ha Of semi detached residential…

A: GIVEN DATA:- PARKLAND AREA=9 HA C=0.25 SEMI DETACHED RESIDENTIAL AREA=2HA C0.60…

Q: What is the peak flow from a watershed with 2 acres and runoff coefficient of 0.8, for a 25-year…

A: Step 1:To find the peak flow from a watershed using the Rational Method, we need to know the…

Q: 2. of dred minutes due to a storm. At the outlet of the catchment, the stream draining the catchment…

Q: A rain depth of 10 inches falls on a developed area of Charleston (CN = 90). Estimate the runoff.…

Concept explainers

Storm Sewers and Detention

The storm drains system transports rainwater or stormwater and other runoff from roads, parking lots, and roof downpipes directly to nearby creeks, rivers, or the sea without any treatment.

Question

Problem 4.2. Determine the peak rate of runoff from an 8-ha (20-ac) watershed during a 30-min storm
that gave the following amounts of rain during successive 5-min periods: 3, 8, 15, 15, 8, and
3 mm (0.1, 0.3, 0.6, 0.6, 0.3, and 0.1 in). The time of concentration for the watershed is 10
min. The runoff coefficients for the 2 ha (5 ac) are 0.2 and 0.6 for the remaining 6.0 ha (15
ac). What is the approximate return period for this runoff if the watershed is at your present
location?

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Step by step

Solved in 2 steps

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.

Similar questions

It rains 3.0 in on a 20 acre watershed. What is the volume of runoff if 30% of the watershed area is a lake, and infiltration on the remaining soil is estimated at 1.0 in? Express your answer in ft³. Assume the lake level is low and does not contribute to runoff (i.e. the lake only serves as storage space).
Problem is asking for a change in volume
A small catchment area of 150hectare received a rainfall of 10.5cm in 90 min due to a storm at a the outlet of catchment draining the catchment was dry before the storm & experienced a runoff lasting for 10 hrs with average discharge of 1.5 m3/s the stream was dry again after runoff event. a) What is amount of water which was not available to runoff due to combine effect of infiltration evaporation? b) What is the ratio of runoff to precipitation?
Please help.
A 6-h storm had 6 cm of rainfall and the resulting runoff was 3.0 cm. If the p-index remains at the same value the runoff due to 12 cm of rainfall in 9 h in the catchment is 9.0 cm 4.5 cm 6.0 cm 7.5 cm
.
3. A 55.0 ML/d wastewater treatment plant discharges to a river system with a maximum spring flow of 149.5 m3/min and a minimum summer flow of 98.2 m3/min (upstream of the outfall from the plant). What total allowable BOD (mg/L) could be discharged by the plant if the BOD in the river after dilution must not exceed provincial standards, and there is already 1.1 mg/L of pollution in the river upstream?
The surface runoff hydrograph after the base flow separation is called: * None of the these Direct Runoff Hydrograph (DRH) Base Flow (BF) Discharge (Q) Unit Hydrograph (UH) The total rainfall in a catchment of area 1200 Km2 during a 6-hr storm is 16 cm. The surface runoff is 1.2 *10^8 m3. The infiltration index is: * 1.2 cm/hr 0.1 cm/hr 1 cm/hr cannot be estimated with the given data 0.2 cm/hr
with full solution
A 6 hour storm has 6 cm of rainfall and the resulting runoff was 3 cm. if the phy index remains at the same value, which one of the following is the runoff due to 12 cm of rainfall in 9 hours in the catchment?
Along a day, precipitation is monitored four times with equal time intervals. The recorded data were 10, 12, 16, 8 mm for a catchment has an area of 3000m2. If the measured runoff in this day was 90m3, the infiltration rate is equal to