Research Article

Influence of Hydrological Model Selection on Simulation of Moderate and Extreme Flow Events: A Case Study of the Blue Nile Basin

Table 6


S. numberParameterUnitValue

SACRAMENTO

1Additional fraction of pervious area (Adimp)(—)0.0023
2Lower Zone Free Water Primary Maximum (Lzfpm)(mm)12.987
3Lower Zone Free Water Supplemental Maximum (Lzfsm)(m)24.998
4Ratio of water in LZFPM (Lzpk)(mm)0.061
5Ratio of water in LZFSM (Lzsk)(mm)0.035
6Lower Zone Tension Water Maximum (Lztwm)(mm)241.28
7Impervious fraction of the basin (Pctim)(—)0.003
8Minimum proportion of percolation ()(—)0.658
9Exponential percolation rate ()(—)0.661
10Fraction of water unavailable for transpiration (Rserv)(—)0.310
11Catchment portion that loses water by evaporation (Sarva)(—)0.010
12Fraction of base flow which is groundwater flow (Side)(—)0.330
13Flow volume through porous material (Ssout)m3/s/km20.001
14Upper Zone Free Water Maximum (Uzfwm)1/day79.728
15Ratio of water in UZFWM (Uzk)1/day0.0103
16Upper Zone Tension Water Maximum (Uztwm)1/day99.659
17Factor applied to PBASE (Zperc)(—)11.479

IHACRES

1Delay (day)28.00
2Recession rate 1 () (1/day)−0.888
3Peak response 1 () (—)0.112
4Time constant 1 () (day)8.424
5Volume proportion 1 () (°C)1.000
6Mass balance term () (—)0.005
7Drying rate at reference temperature ()(°C/day)2.000
8Temperature dependence of drying rate () (—)0.000
9Reference temperature () (°C)20.00
10Moisture threshold for producing flow () (mm)0.000
11Power on soil moisture () (—)1.000

AWBM

1Fraction of catchment area for the first store () (—)0.634
2Fraction of catchment area for the second store ()(—)0.366
3Base flow index (BFI)(—)0.629
4Storage capacity of first store ()(mm)24.961
5Storage capacity of second store ()(mm)140.793
6Storage capacity of third store ()(mm)301.082
7Base flow recession constant () (day)0.999
8Surface flow recession constant () (day)0.972