The lowest portion of the capacity-elevation curve of a proposed irigation reservoir, draining 20 km? of catchment, is represented by the following data in Table 2. The rate of silting for the catchment has been assessed to be 25 m/km2/month. Assuming the life of the reservoir to be 5 decades. a) Determine the dead storage and the lowest sill level (LSL) if the main canal is 6 km long with the bed slope of 1 in 1000, and the canal bed level at the tail end is at RL 594.5 m. The Full supply discharge (FSD) of the canal at the head is 0.08 m and the

The lowest portion of the capacity-elevation curve of a proposed irigation reservoir, draining 20 km? of catchment, is represented by the following data in Table 2. The rate of silting for the catchment has been assessed to be 25 m/km2/month. Assuming the life of the reservoir to be 5 decades. a) Determine the dead storage and the lowest sill level (LSL) if the main canal is 6 km long with the bed slope of 1 in 1000, and the canal bed level at the tail end is at RL 594.5 m. The Full supply discharge (FSD) of the canal at the head is 0.08 m and the

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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A reservoir covers an average surface area of 40 km< with an average depth of 25 m. The inflow to the reservoir comes from a river having an average flow rate of 63.4 m/s which has a suspended sediment concentration of 5 g/L. (a) Estimate the average annual runoff in m³ as well as the average annual sediment load in kg. Determine the most probable life of the reservoir in years to the point where it is 80 percent full of sediment. Assume that the accumulated sediment has a bulk density of 1800 kg/m3. Use the following reservoir trap efficiency table below and interpolate between trapping efficiency values if needed. Compute per increment of 200 x 100 m3 of reservoir capacity. Storage Capacity/Annual Inflow Sediment Trapped, % 0.01 0.1 0.3 0.5 0.7 0.9 45 87 89 92 95 97 99
Q1/A reservoir has a capacity of 50 Mm³ and average annual inflow of 75 Mm³. Area of the catchment is 1000 km². Sediment yield and the specific weight of the sediments are estimated at 550 tons per km² and 1375 kg/m³ respectively. The trap efficiency may be approximated by Y=100 [1- 1 where Y is the trap efficiency in percent and X is /the capacity inflow ratio, using three increments, calculate how long will it take for the reservoir to become 60% filled with sediment? 3 65X+1
Q- A volume of 3.0 x 106 m³ of ground water was pumped out from an unconfined aquifer uniformly from an area of 5 km². The pumping lowered the water table from initial level of 102 m to 99 m. Find the specific yield of the aquifer.
Design an earthen canal to carry a discharge of 40 cumecs and the mean diameter of silt particles is 0.3 mm.
Problem-3 An unlined canal is designed for a discharge of 20 m³/s. If the silt factor is 1 and the width of canal is 15 m. Find the scour depth as per Lacey's formula is m.
Consider a regime channel having a discharge of 50 m3/s and silt factor 1.10. The hydraulic radius for the given channel is
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% The Time of Concentration is 20¹ 12¹ n = 0.035
1) Determine time of concentration, tc, for use the NRCS Method for a drainage basin located near Bismarck, North Dakota, having a hydraulic path described as follows: Overland Flow: average grass, 100' long, 1.6% average slope Shallow Concentrated Flow: 680' long. 3.2% average slope Stream Flow: 2950' long, 0.61% average slope, in a trapezoidal Channel, 4 ft deep, 12 ft at the base, 20 ft at the top, n = 0.035.
The figure is a plan view of a confined aquifer showing two contaminated zones, 1 and 2. The aquifer has a saturated thickness of 80 ft, hydraulic conductivity of 42 ft/d, and the regional hydraulic gradient is 0.0075 from right to left as shown. A pumping well with a flow rate of 170 gpm is planned to run continuously at the location shown, and form a stable (equilibrium) capture zone. You may assume that the 2500 ft distance from the well to zone 1 is long enough that the capture zone has reached its maximum width. 2 200 ft Determine: pumping well 2500 ft 700 ft regional flow direction 1. If contamination from zone 1 find its way to the pumping well? Provide support for your answer with a capture zone analysis or contaminant simulation model. 2. If contamination from zone 2 find its way to the pumping well? Provide support for your answer with a capture zone analysis or contaminant simulation model.
A 300 acre watershed just south of Chicago is currently undeveloped (woods). The soils are primarily clay, the hydraulic length of the watershed is 6560 ft, and the average lank slope is 1%. Determine the SCS synthetic UH before development and finish the table below. Solution: from Table 11.7; 1. For clay soil with woods cover, CN= 2. The soil moisture deficit S = in; 3. For a watershed with hydraulic length, time of concentration Te= hr min; 4. Time to peak Tp= min: 5. Peak discharge Op= cfsjin; 6. Storm duration is AD= hr= min; 7. The -min UH is displayed below using Table 11.11; Flow Time Time Ratios Flow Ratios (min) (cfs) (t/tp) (9/ap) 21 13 0.1 0.2 40 42 0.31 0.4 0.66 0.6 0,93 0.8 125 121 0.93 1.2 102 146 1.4 0.78 167 73 0.56 1.6 51 188 0.39 1.8
Determine the overflow rate, hydraulic detention time and the size of spherical sand particle (2.6g/cm3) which is 100% removed by 10 primary sedimentation tanks that operate in parallel to treat a flow of 0.7 m3/s with the following dimensions Length = 70m, width = 12 m and depth=3m. Assume 20°C for the water temperature.
initial capacity of 25,000 acre-ft if the average annual inflow is 40,000 acre-ft ,The useful life of the reservoir will terminate when 75 percent of its initial capacity is filled with sediment. Capacity inflow ratio for orange layer is Select one: O A. 0.468 O B. 0.625 O C. 0.38 O D. 0.58