Solve the problem using the NRCS method for a watershed located right outside New York City, New York for a 50 year storm event. Assume the soil hydrologic group B (65%), C (25%) and D (10%). Given Am=1.29 sm. Impervious = 6.6 acres, Woods =819 acres. Overland flow: L=100 ft, s=4%, fair; Shallow Concentrated Flow: unpaved L= 2300 ft, s=2.7%, stream flow L=9000 ft, s= 3.4%, Stream is trapezoidal with a bottom width of 12 feet, top width of 20 feet for a depth of flow of 4 feet, n=0.035. Calculate the Curve Number?

Solve the problem using the NRCS method for a watershed located right outside New York City, New York for a 50 year storm event. Assume the soil hydrologic group B (65%), C (25%) and D (10%). Given Am=1.29 sm. Impervious = 6.6 acres, Woods =819 acres. Overland flow: L=100 ft, s=4%, fair; Shallow Concentrated Flow: unpaved L= 2300 ft, s=2.7%, stream flow L=9000 ft, s= 3.4%, Stream is trapezoidal with a bottom width of 12 feet, top width of 20 feet for a depth of flow of 4 feet, n=0.035. Calculate the Curve Number?

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

We are to determine the seepage (infiltration) in a 250 hectare reservoir. The reservoir has 0.50 m^3/s of inflow, 0.3 m3/s of outflow, and total storage increase of 19600 m^3. A discharge of 0.1 m^3/s of water is coming out of reservoir to be used for irrigation of the around farms AUSGS gage next to the lake reservoir recorded a total of 20 mm Precipitation for the lake for a week. The evaporation loss, in mm is 24mm.T-0. Calculate the leakage (seepage) in mm for a week from this dam reservoir.(use 4 decimal in your answer donot put unit) e.g. 3.456mm put 3.4560 in your answer
(b) At the beginning of the month of June, water level of a reservoir with surface area of 7km? was at 20m (Refer to reservoir characteristic curve in Figure Qla). Average longterm monthly rainfall for the month of June recorded at five raingages is summarized in Table Q1 (assuming the same average amount of rainfall is also recorded in the reservoir). The inflow to the reservoir X, located at the downstream catchment outfall, resulted from that rainfall can be estimated as Qin =0.65PA where P is mean areal rainfall (to be estimated by Thiessen Polygon) from a 36km² catchment area A, schematically shown in Figure 1b. An average monthly withdrawal of 6MCM from the reservoir is required for water supply purpose. Assume there is no losses from the reservoir except evaporation at 120cm/year. Determine the volume of water required to be pumped into the reservoir in that specific month to achieve a safe operating level at 21m. 80 70 60 50 V = 4.7H - 70 40 30 20 10 Note: MCM is million m' 5…
Hydrology Give me right solution according to the question
4. A reservoir has an average area of 50 km over a year. The normal annual rainfall at the place is 120 cm and the class A pan evaporation is 240 cm. Assuming the land flooded by the reservoir has a runoff coefficient of 0.4, estimate the net annual increase or decrease in the streamflow as a result of the reservoir. (Problem 3.3, Subramanya 4th Ed.)
Taal lake has five sub areas covering its entire catchment surface area. Its water surface elevation is 640m above mean sea level. During a storm event, data given below was recorded. Calculate the new water surface elevation after the storm event. Assume that there is no contribution to or from evaporation & infiltration. Sub Areas Area (km^2) Outflow runoff (cm) Inflow runoff (cm) PH Rainfall Advisory Talisay 58.55 61.00 42.00 RED San Nicholas 81.97 39.00 45.00 ORANGE Laurel 35.13 20.00 47.00 YELLOW Agoncillo 18.74 52.00 126.00 ORANGE Balete 39.81 32.00 20.00 RED The average outflow runoff is cm The average inflow runoff is cm The mean precipitation using Thiessen polygon method is mm The mean precipitation using arithmetic mean method is mm The new water surface elevation is m
2) Determine time of concentration, tc, for use in the Rational Method for a drainage basin having a hydraulic path described as follows: Overland Flow: average grass, 80' long, 2.5% average slope Shallow Concentrated Flow: 450' long. 4.8% average slope Gutter Flow (Treated as Shallow Concentrated Flow): 200' long, 1.9% average slope.
Followings are given for a watershed: Rational method coefficient C = 0.37 Time of concentration = 30 min Watershed Area = 4.7 km^2 Rainfall intensity is 1.8 cm/hr Part 1: CIA=? (Must show calculation details for Part 1) (For Parts 2 to 4, pick only one choice and fill that blank) Part 2: If rainfall duration is 15 min, the peak flowrate is: a. b. uncertain, but it is smaller than C. uncertain, but it is greater than Part 3: If rainfall duration is 30 min, the peak flowrate is: d. e. uncertain, but it is smaller than f. uncertain, but it is greater than Part 4: If rainfall duration is 60 min, the peak flowrate is: g. h. uncertain, but it is smaller than_ i. uncertain, but it is greater than
A peak flow of a flood hydrograph due 3 to a 6 hour storm is 470 m³/s. The corresponding average depth of rainfall is 8 cm. Assume an Infiltration loss of 0.25 cm/hour and a constant base flow 3 of 15 m³/s. What is the peak discharge of 6 hour unit hydrograph for this Catchment?
A stream of 135 L/s was diverted from a canal and 100 L/s were delivered to the field. An area of 1.6hectares was irrigated in 8 hours. The effective depth of root zone was 1.8 m. the runoff loss in the fieldwas 432 m3. The depth of water penetration varied linearly from 1.8 m at the head end of the field to1.2 m at the tail end. Available moisture holding capacity of the soil is 20 cm per meter depth of soil.Irrigation was started at a moisture extraction level of 50 percent of the available moisture. Determine;a. The water conveyance efficiencyb. The water application efficiencyc. The water storage efficiencyd. The water distribution efficiency
Provide the correct answer .
The observed rainfall and discharge of a catchment is given the table. The catchment area is 0.23Km^2. Time (h) 1 2 3 4 5 6 7 8 00 9 10 11 12 13 Rainfall (mm) 0 0 2 6 10 8 2 0 0 0 0 0 0 1. Estimate the base flow. 2. Estimate the surface runoff. 3. Estimate the initial loss 4. Estimate the continuous loss using phi method. Discharge (M3/s) 20 20 20 20 30 50 40 35 25 21 20 20 20
Hello, I need help with this particular question.