FLOOD04950

• Designation Number: 54
• County: Jefferson
• Community: Unincorporated Jefferson County
• Stream Name: Lena Gulch
• Basin: South Platte
• Title: Pleasant View Drainage Study
• Date: 11/1/1975
• Designation Date: 3/1/1976
• Floodplain - Doc Type: Floodplain Report/Masterplan

Figllre II-I

Figure II

Figure II

Table II-I

Table III

Table III

Table III - 3

Table III - 4

Table III - 5

Table III - 6

Figure III-I

Figure III - 2

Figure III - 3

Figure IV -- 1

Table IV -- 1

Table IV

2

Table IV

3

Tahle IV 4

Table IV 5

,Figure V 1

Table V 1

Table V 2

Table V - 3

Table V

4

Table V

5

Figure VII - 1

LIST OF TABLES AND FIGURES

Page

Drainage Basin --------------------..-----.------ 3

2

Aerial Photograph ______________n______________ 4

3

Land Use Map

5

Reach Limits __________n________________________ 6

1

Hydrologic parameters

8

2

Storm Unit Hydrograpb -------------------------- 11

2-Year Storm HyJrograph ------------------- 12

5-Year Storm Hydrograph --------------------- 12

lO-Year Storm Hydrograph -----.------.-------- 13

laO-Year Storm Hydrograph ------------------ 13

Intp.nsity - Duration Cllrves -----.----------- 9

Rainfall - Duration -- Frequency Curves -- 10

lOa-Year Flood Plain Boundary ------------ Envelope
Hap (Scale 1" = 200':1

Special Drainage Problem ---..----------------- 17

Peak Runoff Rates at Design Points ------ 15

2-Year Stom Hydrograph -----...------------- -19

5-Year Stom Hydrograph ------------------- 19

lO-Year Storm Hydrograpb ------------------- 20

laO-Year Storm Hydrograph ---------..------ 20

Location of Alignments and
Detention Popd Locations ----------------- 22

Street Crossing Sizes --..--..-----------..---- 23

Closed Conduit Sizes ----------------------- 23

Detenti.on Popd VOlumE'S ------------..------ 25

Unit Costs -..----..---------------.------------- 26

Alte.rnate Costs ----------..-..----.----------- 27

Runoff Rates at Design Points ------..----- Envelope