Assuming that 30% of the rainfall runs off, the volume of runoff (acre-feet) from a storm with a 1.32 acre-feet. Round to 1 in/hr average intensity for 1.75 hrs on a 160-acre watershed is______ significant figure. The time of concentration for a watershed with a 10,000 ft. flow length that has a slope of 5.00% slope is minutes.

Assuming that 30% of the rainfall runs off, the volume of runoff (acre-feet) from a storm with a 1.32 acre-feet. Round to 1 in/hr average intensity for 1.75 hrs on a 160-acre watershed is______ significant figure. The time of concentration for a watershed with a 10,000 ft. flow length that has a slope of 5.00% slope is minutes.

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter16: Highway Drainage

Section: Chapter Questions

Problem 10P

See similar textbooks

Similar questions

A small catchment area 300 km2received a rainfall of 15cm in 1 hour, due to a storm draining thecatchment was dry before the storm and experienced a runoff lasting for 5 hours with an averagedischarge Value of 3 m3/sec. The stream was given dry after the runoff event.(a) What is the amount of water in cm3 which was not available to runoff alone to combined effectof infiltration, evaporation and transpiration.(b) What is the ratio of total and direct runoff to precipitation.
A 6-hour rain of average intensity 2 cm/hour falls over the fern leaf type catchment as shown in Figurebelow. The time of concentration from the lines AA, BB, CC and DD are 1, 2, 3 and 4 hours,respectively, to the site 0 where the discharge measurements are made. The values of the runoffcoefficient C are 0.5, 0.6, and 0.7 for the 1st, 2nd and 3rd hours of rainfall respectively and attain aconstant value of 0.8 after 3 hours. Draw surface runoff hydrograph from the runoff collected from thecatchment and also calculate volume of direct Runoff.
Q- A catchment area of 65 Sq. Km. in Gilgit received a rainfall of 12 cm from a 3-hours storm. At the outlet of the catchment, a natural stream had a steady flow of 10 cumecs before the storm and experienced a runoff lasting for 20 hours with an average discharge value of 90 cumecs. The stream was again to its original steady state with a flow of 10 cumecs. Estimate the losses and ratio of runoff to precipitation.
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.
5.3 Estimate the runoff volume, in mm of depth, from 80 mm of rainfall on a 90-ha watershed during the growing season. Assume antecedent rainfall condition II, 50 ha of row crop contoured with terraces, poor condition, soil group C, and 40 ha of alfalfa, straight, good condition, soil group B. 5.3 Estimate the runoff volume, in mm, m3, and ha·m, for the watershed and conditions in Problem 5.2, except that a 60-mm storm occurred 3 days before the 80-mm rainfall. 5.4 Estimate the runoff volume, in mm, for the watershed and conditions in Problem 5.2, except that no rainfall occurred for 6 days before the 80-mm rainfall. 5.5 Estimate the runoff volume, in mm, for a 24-h, 50-yr return period storm at your location. Assume the watershed conditions in Problem 5.2.
Subject: Hydrology Give me right solution Determine the 10-year period peak runoff for 80 hectare watershed having a runoff coefficient of 0.4. The maximum length of flow of water is 610 meters and the fall along this path is 6.0 meters. The rainfall intensity for that return period is 101.25 mm/hr having duration equal to the time of concentration.
please show steps and explain If the rainfall excess consists of two bursts of 3.3 in./hr and 1.8 in./hrs, each for 20 minutes, and the 20-minute UH (1”) hasordinates of 15, 40, 25, and 10 ft3/s, compute the distribution of direct runoff.
Runoff on a 0.5-hectare parking lot flows toward a low area and then toward a street drain. This flow pattern yields concentrated flow with a width of roughly 1.75 m (you can assume rectangular flow cross section) and a slope of 0.2%. The surface of the parking lot provides a Manning’s roughness of 0.020. If a storm with an average intensity of 2.00 cm/hr passes over the parking lot, how deep will the concentrated flow be? You may assume that the vast majority of rainfall reaching the parking lot will become runoff and that storm duration is sufficiently long to allow all parts of the parking lot to contribute to runoff.
A catchment area of 100 Sq. Km. in Gilgit received a rainfall of 12 cm from a 3-hours storm. At the outlet of the catchment, a natural stream had a steady flow of 10 cumecs before the storm and experienced a runoff lasting for 20 hours with an average discharge value of 90 cumecs. The stream was again to its original steady state with a flow of 10 cumecs. Estimate the losses and ratio of runoff to precipitation.
A direct-runoff hydrograph due to isolated storm was triangular in shape with a base of 80 h and peak of 200 m^ 3 / s . If the catchment area is 1440 km ^ 2 the effective rainfall of the storm is
An urban park has a drainage basin area of 398 ac. The 25-year rainfall event has a precipitation intensity of 2.382 in./h. If the C factor is 0.75, what is the maximum rate that overland flow will drain from the urban park?
A storm with 12 cm precipitation produced a direct surface runoff of 7.2 cm in the equivalent depth unit. Assume the duration of the excess rainfall (te) is equal to the total duration of the storm for the first trial, te = 5 hr. Compute the trial value of Ø