FLOOD05178

• County: Jefferson
• Community: Lakewood
• Stream Name: Weaver Creek
• Basin: South Platte
• Title: CLOMR Report for Preserve at Weaver Creek HEC-2 Cross Sections 24+30 to 42+95
• Date: 12/26/2000
• Prepared For: Fairfield Homes
• Prepared By: David Evans & Associates
• Floodplain - Doc Type: Floodplain Report/Masterplan

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2. Profile Checklist (check box If Information has been provided on profile)

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Explain how they were determined.

3. STARTING WATER-SURFACE ELEVATIONS
Explanation Attached?

No

NOTE: If the effective study is an approximate study, the slope/area method is recommended.
For detailed anal sis studies, usin a known water-surface elevation is recommended.

4. RESULTS from the model used to revise the 100- ear water surface elevations

If the results indicate any of the following, attach an explanation - to this form, or to the hydraulic model printout- as to the
reasonableness of the situation,

o Supercritical depth

IZI Critical Depth

o Drawdowns

o Negative FloodWay Surcharges

o Floodway Surcharges Greater Than Maximum Allowed by Community/State
o Water surface elevations higher than the end points of cross sections.
o Floodway discharge is different than the Natural 1 OO-year (base) flood discharge.
IZI Project causes 100-year floodplain or floodway elevations to increase (state if increases are located off the
requeste~s property)

explanation attached with Form 181

Explanation provided on attached printout 0

If Hydraulic model used is HEC-2, has It been checked with FEMA'S CHECK-2 computer program? 181 Yes
see Instructions for Information on how to obtain CHECK-2
5. REVISED FIRM/FBFM AND FLOOD PROFILES

o No

1. Profile Transition

a. 100- Year Water-Surface Elevations - indicate the difference in water surface elevations where the project 100-year
elevations tie into the existing 100-year water surface elevations at each end of the project.

Downstream End 2430 within 0.00 (feet)
Cross-Section #

Upstream End ~ within 0.08 (feet)
Cross-Section #

b, Floodway Elevations - indicate the difference in water surface elevations where the project floodway elevations tie into
the existing floodway water surface elevations at each end of the project.

Downstream End t:!ffi within _ (feet)
Cross-Section #

Upstream End N1A within _ (feet)
Cross-Section #

c, Floodway widths - indicate the difference in floodway widths where the project fIoodway widths tie into the existing
width at each end of the project.

floodway

Downstream End N/A within _ (feet)
Cross-Section #

Upstream End N/A within _ (feet)
Cross-Section #

The following information (unless in parentheses) must be included at the same scale as the existing profiles for this project:

IZI Stream Name

IZI Community Name
IZI

o Corporate Limits labeled

o Study limits labeled
IZI Closs Sections labeled

o Confluences labeled

Channel Stationing

IZI Streambed profiled

IZI HorizontalNertical Scales indicated

IZI 1 OO-year elevs profiled'
IZI Low Chord Elevations

IZI Top of Road Elevations

IZI Road Crossings

IZI Labeled

'All recurrence intervals in the effective study must also be profiled,

Floodway Data Table

Attach a Floodway Data Table for each cross section listed in the published Floodway Data table in the FIS report.

Floodway Data Table Attached 0 Yes

181 Not Required

FEMA Form 81-89C

Riverine Hydraulic Analysis Form

MT -2 Form 4 Page 2 of 2