A launching apron is to be designed at downstream of a weir for discharge intensity of 6.5 m³/s/m. For the design of launching aprons the scour depth is taken two times of Lacey scour depth. The silt factor of the bed material is unity. If the tail water depth is 4.4m, the length of launching apron in the launched position is m.

A launching apron is to be designed at downstream of a weir for discharge intensity of 6.5 m³/s/m. For the design of launching aprons the scour depth is taken two times of Lacey scour depth. The silt factor of the bed material is unity. If the tail water depth is 4.4m, the length of launching apron in the launched position is m.

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

The flow net under a hydraulic structure has 5 flow channel with 10 equipotential drops. If the permeability of the bed material is 1.5 *10^-4 m/sec, find the quantity of seepage per meter width of the structure in m ^ 2 /sec under 3m head.
I An unlined canal under regime conditions along with a silt factor of 1 has a width o flow 71.25 m. Assuming the unlined canal as a wide channel, the corresponding averag depth of flow (in m, round off to two decimal places) in the canal will be D=? B = 71.25 m
Civil.problme.
Consider a regime channel having a discharge of 50 m3/s and silt factor 1.10. The hydraulic radius for the given channel is
Troughs are 30ft long and width is 20% less than it length and one fourth of length is the measure to the center with horizontal flat bottom. The backwash rate is 24 in/min. Estimate (1) water depth of the troughs with free flow into the gullet, and (2) the distance between the top of the troughs and the 30-in sand bed. Assuming 40% expansion and 6in in free board in the troughs and 8 in of thickness.
The peak discharge was found to be 0.706 m3 /s. It has been determined that a water flow speed of 1.5 m/s is needed to maintain scour velocity. Calculate the approximate diameter of a circular culvert needed to carry 0.706 m3 /s if the culvert is flowing half-full. А) 1.1 m B 1.3 m 0.6 m D 0.8 m
At a well the ground elevation is 1510.0 (m asl), the depth to the water is 5.0 (m) and the lithology is 0-10 m sand; 10-12 m grey clay. What is the hydraulic head in m asl and the hydraulic gradient?
2
A dam, shown in Figure 5 retains IO m of water. A sheet pile wall (cutoff curtain) on theupstream side, which is used to reduce seepage under the dam, penetrates 7 m into a 20 mthick silty sand stratum. Below the silty sand is a thick deposit of clay. The averagecoefficient of permeability of the silty sand is 2.0 x 10-4 cm/sec. Assume that the siltysand is homogeneous and isotropic.(i) Draw the flow net under the dam.(ii) Calculate the seepage rate, q per meter length of the sheet pile.
Question: Open channel test is performed and according to the following; (Q = 0.03484 m3/sn)( sill thickness = 2.5 cm) a) Find the critical depth b) Find minimum energy on the sill y=6.6 cm y2 = 1.6 cm Sill
A mechanically cleaned bar rack screen is installed ahead of a velocity controlled grit chamber. The bars are 10 mm thick, and the openings are 20 mm wide. The flow through the screen is 0.75 m3/s, and the depth of flow is 1.45 m in the channel upstream of the bar rack. 1. Calculate the flow velocity through racks (m/s). 2. Calculate the water depth in the channel downstream of the bar rack (m).