Page 154 - CIWA Water Data Revolution Overview Report

Annex 3.2. Description of water accounting indicators and their equations

No Flux/Indicators Description Equation

1 P advection Precipitation received in the basin, 12
∑
aggregated over the hydrologic year
=1

2 Basin inflow Surface water or groundwater and (Measured
(interbasin diverted into the basin estimates)

transfer)

3 Gross Inflow, Total inflow from all sources + +
GI

4 Change in the See equation 2. See equation 2.

soil moisture,

ΔSM

5 Net Inflow, e gross inflow plus the change in ± ∆
Th
NI soil moisture

6 ET rainfall, ETa that occurs from effective
∑
ETrain precipitation and canopy interception,
=1
summarized for all land cover classes
(1 to n classes).

7 ET incremental, ETa that occurs from other sources
∑
ETincr except effective precipitation and
=1
interception. Includes ET from

irrigation water, groundwater
abstraction, open water sources,

summarized for all land cover classes

(1 to n classes).

8 Landscape ET, ETa from natural landscapes +
ETaland (protected, utilized and modified land