FLOOD06660

• County: Douglas
• County: El Paso
• County: Elbert
• Community: Franktown, Parker
• Stream Name: Cherry Creek Watershed
• Basin: South Platte
• Title: Franktown Parker Tributaries fo Cherry Creek Watershed
• Date: 4/1/1960
• Prepared For: State of Colorado
• Prepared By: USDA Soil Conservation Service
• Floodplain - Doc Type: Floodplain Report/Masterplan

TABLE 3 ~ STRUCTURE DATA
FLOODWATER-RETARDING STRUCTURES AND
Ca'ffiINATION GRADE STABILIZATION AND FLOODWATER-RETP~DING STRUCTURES

Franktown-Parker Watershed, Colorado

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STRUCTURE Nll/mER
ITEM UNIT FP-Al FP-A2 FP-A3 FP-A4 FP-A5 FP-A6
Drainage Area !I sq,mi. 0.58 1,63 1.06 1.73 4.08 7.13
Storage Capacity
Sediment ac. ft. 8 20 7 22 41 54
Floodwater ao.ft. 17 55 24 58 137 198
Water supply ac.ft. 0 0 0 0 0 0
Total ac.ft. 25 75 31 80 178 252
Surface Area
Sediment pool acre 2.1 6.2 2.4 6,7 11,8 18,0
Flooch~ater pool acre 4,9 13.8 7.8 13.8 25.8 37.S
Water supply pool 0 0 0 0 0 0
Volume of Fill cu,yds. 17,683 22,470 12,309 13,192 35,443 43,297
Elevation Top of Dam feet 96.6 101.8 98.8 104.4 96.3 101.1
Maximum Height of Dam feet 26.4 23.2 18.4 24.7 25.4 21.S
Emergency Spillway
I Crest Elevati on feet 92.6 97,8 94.8 100.4 92.3 97.1
1 Bottom width feet 70 80 56 87 135 140
Type Earth Earth Earth Earth Earth Earth
Per cent chance of use 4 4 4 4 4 4
Ave. Curve No. - Condo II 78 77 72 77 77 73
Emergency spillway hydrograph
StOrnl rainfall (6-hr.l ~I inch 2.43 2.32 2.37 2.30 2.23 2.20
Stom runoff inch 0.74 0.63 0.46 0,62 0.58 0.41
Velocity of flow (v ) II ft/sec. 0 0 0 0 0 0
c - c.f.s, 0 0 0 0 0 0
Discharge rate 11
Max. W.S. elev. II ' feet 92.6 97.8 94.8 100.4 92,3 97.1
Freeboard hydrograph
StOrnl rainfall (6-hr. ) 11 inch 3.64 3,50 3.56 3,45 3.34 3.30
Stom runoff inch 1,61 1.43 1.16 1.39 1.31 1,04
Velocity of flow (vc) 11 ft/sec, 5.0 5.9 5.5 6.2 6.5 6.3
Discharge rate 11 c.f.s. 280 505 283 660 1125 1112
Max. w.s. elev, II feet 94.4 100,2 96.9 103.0 95.0 99.8
Principal Spillway "66.00
Capacity-low stage c,f.s. 14.58 30.54 12.00 19.42 71,60
Capaoity Equivalents
Sediment volume inch 0.26 0.23 0,12 0.23 0.19 0.14
Detention volume inch 0.78 0.68 0.48 0.68 0.68 0.52
Spilhray storage inch 0.80 0.80 0.72 0.76 0.56 0,44
Class of structure I "au '-'a.'; Uat' "a" ~/ail l'Iafil

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11 Maximum during passage of hydrograph.
21 Six-hour rain adjusted for area x 0.5 (Engineering Memorandum No. 27, revised),
31 Six-hour rain adjusted for area x 0.75 (Engin2ering Memorandum No.27, revised).
il Total ,;rainage are' above FP-A2 is 2.:;1 square miles; above FP-i\4 is 2.78
sq~3.r2 nilesi and a.:)'_'~le FP-A5 is 6.87 square miles.

Date: April 1960