Computation of discharge: At each observation point across the stream, several measurements are made: the horizontal...
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Computation of discharge: At each observation point across the stream, several measurements are made: the horizontal distance between consecutive observation points, the depth at the observation point, and the mean velocity. Discharge of a partial section is computed by a product of width, average depth and average velocity (Figure 1). 0 1 9₁ = =w₁d₁v₁ 2 1 Figure 1. Channel cross-section for discharge calculation n Q=Σw.d₂v₁ i=1 Assumed channel bottom 5 1 for a total of n segments Water surface 6 1 Y 7 1 Actual channel bottom Discharge Calculation Calculate the discharge at the section given in Figure 1. Data from field observations are shown in Table 1. Follow the sequence of steps suggested in Table 1. Table 1: Field data for discharge calculation Vertical section # 0 1 2 3 4 5 6 7 Depth (m) 4 5 7.2 7.4 7.1 4.7 0 Point Velocity 2.1 2.3 2.7 2.8 2.5 2.2 0 Horizontal segment 0-1 1-2 2-3 3-4 4-5 5-6 6-7 Segment width (m) 4.2 3.3 4.8 5.2 3.7 5.1 5.9 A1= A2= A3= A4= A5= A6= A7= Area (m²) Mean velocity (m/s) Discharge (m³/s) Q= Computation of discharge: At each observation point across the stream, several measurements are made: the horizontal distance between consecutive observation points, the depth at the observation point, and the mean velocity. Discharge of a partial section is computed by a product of width, average depth and average velocity (Figure 1). 0 1 9₁ = =w₁d₁v₁ 2 1 Figure 1. Channel cross-section for discharge calculation n Q=Σw.d₂v₁ i=1 Assumed channel bottom 5 1 for a total of n segments Water surface 6 1 Y 7 1 Actual channel bottom Discharge Calculation Calculate the discharge at the section given in Figure 1. Data from field observations are shown in Table 1. Follow the sequence of steps suggested in Table 1. Table 1: Field data for discharge calculation Vertical section # 0 1 2 3 4 5 6 7 Depth (m) 4 5 7.2 7.4 7.1 4.7 0 Point Velocity 2.1 2.3 2.7 2.8 2.5 2.2 0 Horizontal segment 0-1 1-2 2-3 3-4 4-5 5-6 6-7 Segment width (m) 4.2 3.3 4.8 5.2 3.7 5.1 5.9 A1= A2= A3= A4= A5= A6= A7= Area (m²) Mean velocity (m/s) Discharge (m³/s) Q=
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