FLOOD10385

• County: Jefferson
• Community: Golden, Lakewood
• Stream Name: Upper Lena Gulch
• Basin: South Platte
• Title: Major Drainageway Planning - Upper Lena Gulch - Phase B Report
• Date: 3/1/1994
• Prepared For: UDFCD
• Prepared By: Boyle Engineering Corporation
• Floodplain - Doc Type: Floodplain Report/Masterplan

"'.

35

A-I

B-1

TABLE OF CONTENTS
(Continued)
Summary ...........................................
Appendix A - Interested Agency Comment Letters
Appendix B - References
Plan and Profile Drawings
i

TABLE OF CONTENTS

I

I

I.

VII.

111

IV

1
1

1

Letter of Transmittal

Background ".........
Drainageway Description

Table of Contents

of Figures

of Tables

Introduction

List

List

11

III

IV.

I.

I

I

I
-I

4

4
4

Basin Description

Basin Characteristics ..
Existing Drainageway Improvements

II.

I

I

6

6
6
,,6
12

Hydrology

General ........"""
Modeling Methodology
Model Input .....,."........"..
Hydrologic Analysis Results

III

I
I

17

17
17
17
17
18
18
18

Analysis

General
Mapping
Methodology .....,..........,..,..,
1 00- Year Floodplain Description
Baseline Damages ............
Floodway Determination ,.
Floodplain/Floodway Table

Hydraulic

IV.

I

I

I

25

25
25

Alternative Evaluation

Development ....
Benefit-Cost Analysis

v.

30

30
33
34

Recommended Alternative Plan

Phase A Recommended Plan ,.
Modifications to Recommended Phase A Plan
Plan Implementation

VI

I

I
I

I

I