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

from good quality high water marks or detailcd water surface profile analyses.

Figure 4-2 illustrates the adjustments performed using the reference flood

water surface elevations.

Composite Damage Functions. The general objective of the analytical

methods developed is to provide a consistent and expedient methodology of

evaluating a range of structural and nonstructural alternatives for existing

and selected alternative future land use patterns. 1~e concept of using

generalized composite stage-damage relationships for the land use categorv

assigned to each grid cell was selected as the mechanism to perform the

analysis rather than the conventional individual structure approach alluded

to previously. The use of the generalized functions provides the capability

to evaluate expeditiously alternative land use patterns that are consistent

with the existing (base) condition land use pattern.

A composite damage function is defined as a stage-damage function for a

specified area within each adopted land use category that has significant

damage potential. The functions may be developed for each land use cate-

gory by averaging the structural and related content values obtained from

sampling a range of structure values and types within each specified cate-

gory (by utilizing field surveys, review of tax records, interviews conducted

with regional and local agencies, etc.). The composite damage function can

include direct and indirect damages associated with each particular land use

category. Table 4-2 illustrates an example of a composite stage-damage

function within a particular land use category. The functions can be devel-

oped for other land use categories such as pasture, developed open space,

etc., although the corresponding damages are small when compared to those

occurring in the structurally developed areas.

DAMCAL can be used to develop the composite stage-dsmage function for a

specific land use category based on the following types of information:

4-8