Pérdidas De Agua Por Precipitación Y Por Infiltración (Métodos De Cálculo)

SURFACE WATER HYDROLOGY

Exercise 1
Rainfall Losses

Student Name: Juan Pablo De la Fuente Cusicanqui
Student ID: r0288473
Data set 15

juan.delafuentecusicanqui@student.kuleuven.be

*
Table of Contents

1. Introduction 1
2. Theoretical Background 1
3. Methodology and Calculation 4
3.1. Runoff Coefficient method with constant base flow 4
3.2. Phi-index method withconstant base flow 8
3.3. Runoff Coefficient method with variable (linear) base flow 13
3.4. Phi-index method with variable (linear) base flow 15
3.5. Infiltration losses – Green and Ampt method 16
4. Results and Discussion 20
4.1. Runoff Coefficient method with constant base flow 20
4.2. Phi-index method with constant base flow 24
4.3. Runoff Coefficient method with variable(linear) base flow 27
4.4. Phi-index method with variable (linear) base flow 32
4.5. Infiltration losses – Green and Ampt method 34
5. Conclusions 37
6. References 38

Table of Figures

Figure 1: Hydrological cycle (Chow et al., 1988) 2
Figure 2: Storm runoff and base flow (Exercise notes, 2012) 3
Figure 3: The Green and Ampt method (Course notes, 2012) 17
Figure 4: Flowchart for infiltration under variable rainfall rate (Course notes, 2012) 18
Figure 5: Hyetograph obtained by using the Runoff Coefficient method with constant base flow 24
Figure 6: Hyetograph obtained by using the Phi-index method with constant base flow 27
Figure 7: Solution of the straight line separation method for the given data set 28
Figure 8: Hyetograph obtained by using the RunoffCoefficient method with variable base flow 31
Figure 9: Hyetograph obtained by using the Phi-index method with variable base flow 34

Table of Tables

Table 1: Given data set (number 15) 4
Table 2: Calculated Storm runoff (m3/s) 6
Table 3: Calculated rainfall rate (mm/h) 10
Table 4: Calculated Storm runoff (m3/s) for variable baseflow 15
Table 5: Results of total storm runoff volume(m3) for runoff coefficient method 21
Table 6: Result of calculation for the total rainfall volume of the storm (m) 22
Table 7: Results of net rainfall rate and losses (mm/h) for runoff coefficient method with constant base flow 23
Table 8: Results of total storm runoff volume (mm/h) for Phi-index method 25
Table 9: Results of the calculated loss rate values (mm/h) 25
Table 10: Results ofnet rainfall rate and losses (mm/h) for Phi-index method with constant base flow 26
Table 11: Results of the logarithm of the recession period (m3/s) 27
Table 12: Results of time (min) and base flow (m3/s) at the end of the storm 28
Table 13: Results of base flow obtained by the straight line base flow separation method 29
Table 14: Results of total storm runoff volume (m3) for runoffcoefficient method with variable base flow 30
Table 15: Results of net rainfall rate and losses (mm/h) for runoff coefficient method with variable base flow 31
Table 16: Results of total storm runoff volume (mm/h) for Phi-index method with variable base flow 32
Table 17: Results of the calculated loss rate values (mm/h) for variable base flow 33
Table 18: Results of net rainfall rate andlosses (mm/h) for Phi-index method with variable base flow 33
Table 19: parameters for the calculation of the infiltration rate 34
Table 20: Results of calculation of infiltration rate (mm/h) and cumulative infiltration (mm) for the Green and Ampt method 35
Table 21: Iterations made by Solver tool of excel to obtain the approximated value of F(t) (mm) 36
Table 22: Results of infiltrationanalysis using Green and Ampt method for net rainfall rate 36
Table 23: Hyetograph obtained for losses by infiltration using the Green and Ampt method 37

*
Rainfall Losses

1. Introduction

The scope of the present exercise is to analyze the rainfall losses using different methods that are usually applied in the field of hydrology to calculate the net rainfall from rainfall intensity...