Question

Q1. The stage-discharge data of a river are given below. Establish a stage discharge relationship to predict the stage for known discharge. Assume the stage value for a zero discharge as 20.50 m. Also determine the stage of river corresponding to a discharge of 2600 m3/s. Table 1: Stage discharge data Stage (m): 21.95 22.45 22.8 2323.4 23.75 23.65 Q (m3/s)100 220 295 400 490 500 640 Stage (m) 24.05 24.55 24.85 25.4 25.15 25.55 25.9 m3 /s) 780 1010 1220 1300 1420 1550 1760 Q2. Problem 8.5 Q3. A 200 g/I solution of common salt was discharged into a stream at a constant rate of 0.025 m3/s. The background concentration of the salt in the stream water was found to be 10 ppm. At a section where the solution was believed to have completely mixed, the salt concentration was found to reach an equilibrium value of 45 ppm. Estimate the discharge in stream Q4. Stage-discharge data for a river was used to extract following information. Determine the stage corresponding to zero discharge Table 2: Stage-Dischage Data Stage, G (m): Discharge, Q (m/s): 100 200 400 25.08 25.84 26.85 Q5. A small stream has trapezoidal cross section with base width of 10 m and side slopes 1 Horizontal: 1 vertical in a reach of 5000 m. During a flood the high level record at the ends of reach are as below: Table 3: High water records during flood Section Elevation of bed Water surface elevation Upstream 10.20 Downstream 98.60 102.7 101.30 Using Manning's roughness of n- 0.03, estimate the discharge in the stream.

Answer 1