13 Assessment of Hydrological Impacts …
285
Fig. 4 Conceptual scheme of the GR4J model (Garcia Hernandez et al. 2018)
X1 maximum capacity of the production reservoir;
S water content in the production reservoir
Es evapotranspiration of the production reservoir
The percolation (iPerc) from the production reservoir is therefore calculated as:
i Perc =
d
dt
(S + (Ps − Es).dt).
1 −
1 +
4
9
.
S + (Ps − Es).dt)
X 1
4
−
1
4
(4)
The variation of the production reservoir (S) is:
d S
dt
= Ps − Es − i PercS ≥ 0
( 5 )
The amount of water routed to the routing reservoir (iPr) is determined by: