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Q1) 1. Compare the advantages and disadvantages of Thiessen Polygon Method and Isohyetal Method for estimating areal average rainfall of a catchment. II. For the catchment, with highly uneven topography, shown in Worksheet Q1, estimate the areal (average) rainfall due to a storm event occurred over that catchment. The rainfall measurements at gauges A, B, C, D and E are 15 mm, 50 mm, 70 mm, 80 mm and 25 mm, respectively. Use Thiessen Polygon method • Use Arithmetic average method Comment on the suitability of the above two methods to the given catchment. Q2) I. Water is flowing at normal depth in a 10 m wide trapezoidal channel with a bed slope of 1:3000. The side slopes of the channel are 1H:2V. The channel boundary is made of concrete with Manning's roughness coefficient as 0.012. If the flow rate is 10 m3/s, calculate the height of a hump in the channel that would produce critical conditions without a rise in the upstream water level. II. Comment on the upstream water depth in the channel Q2(1.), if the provided hump height is more than the value calculated above. III. Compute the depth of flow (h) in the composite channel section (symmetrical) shown in Figure 2 when it carries a discharge of 50 m3/s. The bed slope of channel is 1 in 2500, and channel boundary is made of glazed brick. Figure 2 T h 1 I 3m → +3m 1 1m Benching 1
Q1) 1. Compare the advantages and disadvantages of Thiessen Polygon Method and Isohyetal Method for estimating areal average rainfall of a catchment. II. For the catchment, with highly uneven topography, shown in Worksheet Q1, estimate the areal (average) rainfall due to a storm event occurred over that catchment. The rainfall measurements at gauges A, B, C, D and E are 15 mm, 50 mm, 70 mm, 80 mm and 25 mm, respectively. Use Thiessen Polygon method • Use Arithmetic average method Comment on the suitability of the above two methods to the given catchment. Q2) I. Water is flowing at normal depth in a 10 m wide trapezoidal channel with a bed slope of 1:3000. The side slopes of the channel are 1H:2V. The channel boundary is made of concrete with Manning's roughness coefficient as 0.012. If the flow rate is 10 m3/s, calculate the height of a hump in the channel that would produce critical conditions without a rise in the upstream water level. II. Comment on the upstream water depth in the channel Q2(1.), if the provided hump height is more than the value calculated above. III. Compute the depth of flow (h) in the composite channel section (symmetrical) shown in Figure 2 when it carries a discharge of 50 m3/s. The bed slope of channel is 1 in 2500, and channel boundary is made of glazed brick. Figure 2 T h 1 I 3m → +3m 1 1m Benching 1
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