FLOOD07698

• County: Statewide
• Community: Rock Rapids, Iowa
• Basin: Statewide
• Title: Problem Identification Report Rock River at Rock Rapids Reconnaissance Study Section 205
• Date: 4/1/1995
• Prepared For: US Army Corps of Engineers
• Prepared By: Greenhorne & O'Mara, Inc.
• Floodplain - Doc Type: Project

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land use data and structure value data were collected during a site

visit in December 1994. Appendix C contains backup data in support of the

economic analysis performed for this phase of the study.

STUDY AREAS

Six separable flood-prone areas were identified within Rock Rapids

for the purposes of this analysis. These subareas are defined as listed

below in figure 4.

Figure 4
Description of Subareas

Subarea

DescriDtion

1

The right and left overbank areas of Koon Creek to the
west of the abandoned railroad line.

2

The right overbank area of Rock River near its
confluence with Koon Creek, bounded by State Highway 9
on the south side.

3

The left overbank area of Tom Creek to the north of
State Highway 9.

4

The left overbank area of Rock River to the south of
State Highway 9.

S

The right overbank area of Rock River south of South
Fourth Avenue.

6

The right overbank area of Rock River north of South
Fourth Avenue and south of State Highway 9.

FLOOD PLAIN CHARACTERISTICS

Land use data were collected for Rock Rapids within and just

outside of the Rock River SOO-year flood plain limits. Data were

collected for both residential and commercial structures. Data compiled

for each structure included the estimated ground elevation, the estimated

first floor height above the ground, the type of structure (i.e., one-

story residential with basement, commercial warehouse with no basement,

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