FLOOD05706

• County: Statewide
• Community: State of Colorado
• Basin: Statewide
• Title: DAMCAL - Damage Reach Stage-Damage Calculation - Users Manual
• Date: 2/1/1979
• Prepared For: State of Colorado
• Prepared By: Hydrologic Engineering Center
• Floodplain - Doc Type: Educational/Technical/Reference Information

Stage versus % damage to structure

Stage versus % damage to contents

Value of structure

Value of contents (option, % of structure value)

Indirect damage (% of total grid cell dollar damage)

Development density (number of structures per grid cell)

Vacancy allowance (amount of land classified in the particular

category that is developed)

Computational Procedures

I
I

I Aggregation of Damage Functions. The creation of an aggregated elevation-

I damage function for each damage reach index location can be done once the

I spatial data variables (topographic elevation, reference flood elevation,

I damage reach identification and land use patterns) are in the DATA BA~~ and

I composite damage functions have been developed for each land use category.

I

The DAMCAL computer program accesses the DATA BANK and for each grid cell in
the flood plain manipulates the appropriate data in the follOWing manner:

(1) The land use of the cell is determined and the corresponding composite
stage-damage function is placed at the grid cell (Figure 4-3a).

(2) The stage axis of the function is converted to elevation by equating

the zero stage to either ground elevation or first .floor elevation.

The conversion of stage to elevation completes the placement of the

composite damage function at the grid cell (Figure 4-3b).

(3) The next step in the aggregation process is to transfer the grid cell

elevation-damage function to the index location. The data bank is

accessed to determine in which damage reach the cell is located and

then the function is translated to the appropriate index location by

adjusting the elevation axis of the damage function. The adjustment

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