FLOOD10386

• County: Jefferson
• Community: Golden, Lakewood
• Stream Name: Upper Lena Gulch
• Basin: South Platte
• Title: FHAD - Upper Lena Gulch
• Date: 1/1/1993
• Prepared For: UDFCD
• Prepared By: Boyle Engineering Corporation
• Floodplain - Doc Type: Floodplain Report/Masterplan

main channel

I

I

reach upstream of Camp George

Some erosion damage to the main channel is also likely.

Damages to some residential properties in this

are expected

West

just

main channel

the

with

re-combines

flow

The split

upstream of South Golden Road

the

I

I

Sheets 8-9

Sta. 272 + 40 to 289 + 40

L-4

several undersi~ed

through

reach passes

this

through

channe

main

The
culverts

Avenue are both

10th

and

Street

Orchard
which are undersized

under

culverts

The

I

Downstream of the Pleasant View-Lena GUlch Confluence the mainstem crosses

residential structures in

Several

corrugated metal pipes

rectangular

The ditch crosses over the channel in a

rrigation Ditch

the Welch

near the edge of

are located directly In or

low density development

this area of

I

to

nadequate capacity

flume is of

the

The crossing under

flume

concrete

South Golden Road at the downstream end of

The structure at

floodplain

the

I

Between the

to be overtopped

flume

the ditch

flow and causes

flood

convey al

reinforced concrete box culvert

high

wide by 3-foot

triple 20-foot

reach is a

this

sabell Street, the floodplain covers a broad area

Welch Ditch and the crossing at

blocked with sediment,

half

s about

The existing culvert

which is undersized

I

13th

West

the vicinity of

in

However,

mostly underdeveloped property

of

10-year

the

floods greater than

flow overtops South Golden Road during

and

The culvert

floodplain

the

residences lie in

few

a

Street,

Avenue and Isabel

are

road pavement

to

well as

to structures and contents as

reach

Damages

expected in this

event.

I

Flow

the street to be overtopped

is undersized and causes

sabell Street

under

I

Park

Office

West

Denver

the

and continues overland into

sabel

crosses

reach are low due to the shallow nature of

residential property in this

Damages to

Sheets 7-8

Sta. 289+40 to 312+00

L-5

I

the

damage is expected around

erosion and pavement

Minor

flooding

the

sabell Street crossing

meander

flows

Low

the channel is unimproved

Below South Golden Road

I

then into Camp

residential development and

ow density

through a small area of

I

Sta. 223 + 00 to 272 + 40: Sheets 9-10

L-3

two

through

the channel passes

West

Through Camp George

West.

George

which

effect

backwater

These bridges cause a significant

undersized bridges

I

is

West

Denver

Office Park

West

the Denver

within

reach lies entirely

This

View Tributary merges

the Pleasant

from

flow

n addition

inundates a wide area.

-70

located downstream of

-70 with the majority of the development

divided by

just

property

the Camp George West

the mainstem on

floodwater from

with the

I

West

in the study area, Denver

commercial development

While being the largest

from

The Inundated land

View-Lena Gulch Confluence

upstream of the Pleasant

I

mprovements

the drainage

to

related problems due

fevv stornnvvater

has very

flows covers an area approximately

View

the combined Lena Gulch-Pleasant

The Lena Gulch channel has been

the development

nto

which were built

this area IS primarily undeveloped

Fortunately

ong

11 DO-feet

wide by

400-feet

I

100-

for the

and has adequate capacity

the development

throughout

enlarged

6

West

Camp George

floodplain in

the

within

e

structures

major

and no

I

I