WaterWare On-line Manuals: reservoir geometry

WaterWare
Reference &
User Manual

WaterWare On-line Manuals

Release Level

6.2

Release Date

2010 05

Revision Level

1.0

Last modified on: Thursday, 20-May-10 18:12 CEST

WRM web version: Reservoir Geometry

The geometry of a reservoir controls its hydraulic behaviour, level dependent release volumes, flood control (spill), direct precipitation input, evapotranspiration, and seepage.

Reservoir Geometry:

The geometry is defined by a TABLE of a set of triplets, relating reservoir depth with the corresponding area and volumes:

depth (m)

surface area (km²)

volume (Mm³)

Please note that in the editors km² and Mm³ are being used (also for the effective area) for formatting reasons.

Default geometry

The default geometry is defined by a MINIMUM data set of TWO records:

0,0,0 (at the bottom of the reservoir, no water, no area, no volume)
flood level - surface area - storage capacity

In between the model uses linear interpolation, i.e., we consider the reservoir like an inverted pyramid. Between flood level and the crest of the dam, we extrapolate the slope between the base of the dam and the flood level values.

Geometry editor

The gometry editor helps to define additional triplets of values, anywhere (in terms of reservoir water level) between the extreme points:

0.0 (base of the dam)
height of the dam (or crest, top of the dam).

Outside this range, no values are feasible or considered. Under the basic scenario header, we show information about the reservoir (name and description) as well as basic data that define constraints for the geometry:

the maximum height (crest of the dam) that can not be exceeded;
the default triplet of:
1. flood level,
2. surface area (at flood level = storage capacity),
3. storage capacity;

This is READ ONLY at the level of the geometry editor, but is shown and used within the geometry table and graph, providing one fixed point for reference and orientation.

Please note that the additional values (for water level and associated surface area and volume) can be entered in arbitrary sequence: the UPDATE button will re-sort the table according to water level, and redraw the graph for area and volume accordingly. Please note, that both surface area and volume are expected to increase monotonously with reservoir level.

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