QUESTION 2 (50) You have been approached by the City of Johannesburg to carried out flood forecasting as part of the war

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Question 2 50 You Have Been Approached By The City Of Johannesburg To Carried Out Flood Forecasting As Part Of The War 1 (55.97 KiB) Viewed 42 times

Question 2 50 You Have Been Approached By The City Of Johannesburg To Carried Out Flood Forecasting As Part Of The War 2 (55.97 KiB) Viewed 42 times

Question 2 50 You Have Been Approached By The City Of Johannesburg To Carried Out Flood Forecasting As Part Of The War 3 (73.3 KiB) Viewed 42 times

QUESTION 2 (50) You have been approached by the City of Johannesburg to carried out flood forecasting as part of the warning system to the dwellers in Alexandra, whose informal settlements are in the vicinity of Jukskei River. You have been constrained using the Muskingum predictive model. At a given a river reach the flood were measured, between 7 h00 and 17 h00. At the start the flood was 20 (m³/s). Every hour the flood increased by 120% from its previous value until the median of flooding duration. Then, every hour it decreased by 80% from its previous value until the end. Perform the following: 4.1. The outflow values at the point of flood measurements. (Show clearly the details of calculations for the 4 first outflows and you don't have to show details for the rest of values) (35) 4.2. Generate a plot of hydrographs showing both floods (inflows and outflows) (10) 1.3. Calculate the % of attenuation as well as the translation between the peaks of hydrographs. (5) Note: Assumption: product of the two coefficients Co and C₂ is 1/8.5 and difference between C₂ and the third coefficient is 1/2.5. 2
QUESTION 1 (50) The Department of Water and Sanitation has appointed you to be part of the Directorate of Water Resource Planning Systems and has evaluated water challenges in Musina, which is a northernmost town in the Limpopo Province of South Africa. Hence you have been assigned to determine the 2 in 150-year design flood for a dam construction near the town catchment. The catchment size is 13 km² and the half of the longest water course is 2 km. Assume a hypothetical average slope of the catchment area of 11%. The land distribution in the catchment is rural and urban. Use upper values for the range of rational coefficients as well as the range of hydrological parameters. The geospatial information technology showed that the rural area is three quarter of the dam catchment. The urban land distribution is as follows: • 60% populated with houses; 20 % small factories, 10% suburbs, • The rest is lawns and gardens. These comprise 30% of steep heavy soil (of about 8 %) and the rest is flat area (of about 1.5 %). Using 12% dolomites, the distribution in the rural land was found to be: The soil is 77% impermeable and the rest permeable. • 70% grasslands and the rest is farm land. 35 % flat land and the rest is steep area. For both rural and urban areas, use UPPER, values for the range of runoff coefficients (Rational method) as well as for the range of hydrological parameters, where applicable.