FLOOD02900

• County: Adams
• Community: Commerce City
• Basin: South Platte
• Title: Lower First Creek and Direct Flow Area 0055 Major Drainageway Planning
• Date: 5/1/2002
• Prepared For: UDFDC
• Prepared By: Turner Collie & Braden Inc.
• Floodplain - Doc Type: Floodplain Report/Masterplan

T.able 2a: Point Rainfall Values

FREQ I HOUR l_HOlJR 3-HOUR 6-HOVR
2-YEAR 1.00 1.50 l.27 140
j.YEAR US 1.511 1.72 1.95
lC)..YEAR 1.6J l.1I5 2.00 2.20
50-YEAR 2.25 2.55 2.79 3.10
IOO-YEAR 2.65 3.00 3.20 3.50
500-YEAR 319 3.75 400 4.50
,.

NOfE: POI~" RAINFALL "'AI.[,ES USED TO COMPUTE
DESIGN STORM EVENTS

Table 2h' 2-Year Desili!:n Storm

TIME % I-HOUR STQR.\f AREA STORM
tMIN) PT RAIN WfOADJ ADJUST W/ADJUST
'00 2.0 0.02 1.10 0.02
10.00 4.0 0.04 1.05 0.04
15.00 '.4 0.011 1.05 0.09
20.00 16.0 0.16 0.74 0.12
25.00 25.0 0.25 0.74 0.19
30.00 14.0 0.14 0.74 0.10
15.00 6J OJJ6 1.05 0.07
40.00 '.0 0.05 1.05 0.05
45.00 '0 0.03 1.05 0.03
50.00 '0 0.03 1.05 0.03
55.00 '0 0.03 1.05 0.03
6000 '0 0.03 1.05 0.03
65.00 3.0 O.oJ 1.05 0.03
70.00 2.0 0.02 1.05 0_02
75,00 2.0 0.01 L.05 0.02
80_00 2.0 002 1.05 0.02
85.00 2.0 0.02 l.05 0.02
90.00 2.0 0.02 1.05 0.Q2
95.00 2.0 0.02 1.05 0.02
100.00 2.0 0,02 1.05 0.02
105.00 2.0 0,01 l.05 0.02
110.00 2.0 0.01 \.05 0.02
115.00 1.0 0.01 l.05 0.01
120.00 1.0 O.oi 1.05 0.01
125.180 (@5~1N) 0.0100 1.20 0.0120
180.J60 (@5MIN) 0.0036 1.20 0.004]
TOTAL 115.7 1.401 1J45

TlIble 2e: S-Yeu Desiga Storm

TIME ~.I-HOUR STONM AREA STORM
(MrN) PT RArN WfOADJ ADJUST W/ADJUST
'00 2.0 0-03 1.10 0.03
10-'JO 3,7 0.05 1.05 0.05
15.00 '.7 0.12 1.05 0.13
20.00 15.3 0.21 0.74 0.16
25.00 25.0 0.35 0.74 0.26
30.00 13.0 0.18 0.74 0.13
35.00 " 0.08 1.05 0.08
40.00 4.4 0.06 1.05 0.06
45.00 3.' 0.05 1.05 0.05
50.00 3' 0.05 1.05 0.05
55.00 30 004 1.05 0.04
6000 3.0 0.04 1.05 0.04
65.00 3.0 0.04 1.05 0.04
70.00 3.0 0.04 1,05 0.04
75.00 2.' 0.03 105 0.04
80.00 21 0.03 1.05 0.03
85.00 2.1 0.03 1.05 0.03
90.00 2.2 0.03 1.05 0.03
95.00 11 0.03 1.05 0.03
100.00 I.' 0.02 1M 0.02
105.00 " 0.02 1.05 0.02
110.00 I., 0.02 L05 0.02
115.00 I' 0.02 1.05 0.02
120.00 LJ 0.02 1.05 0.02
125-180 (@5MIN) 0.0117 1.20 0.014
180-360 (@5MtN) 0.0064 1.20 0.008
TOTAL 115.7 1.967 1.89S

Tables lIJ-2l1I- 21i!:
Fint Creek Outrall Systems rlanning and
Flood Hazard Area Oelineation
Design Storm~
(Uolldjusted and Adjusted)

2 IIl-Y

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Table d, ear DeslJ!.n Corm
TIME % I-HOUR STONM .AREA STORM
(MfN) PT RATN W/OADJ AOnJST WI^DJUST
'.00 2.0 0.03 1.10 0.04
10.00 3.7 0.06 1.05 0.06
15.00 '.1 0.13 1.05 0.14
20.00 15.0 0.24 0.74 0.18
25.00 25.0 0.41 0.74 0..10
30.00 12.0 0.20 0.74 0,14
35.00 ,.. 0.09 1.05 0.10
40.00 43 0.07 1.05 0.07
45_00 3.' ..06 1.05 0.07
50.00 32 0.05 1.05 0.05
55,00 3.2 0.05 1.05 0.05
6000 3.2 0.05 1.05 0.05
65,00 3.2 O.os 1.05 0.05
70.00 3.2 0.05 1.05 0.05
75.00 3.2 0.05 1.05 0.05
80.00 2.' 0.04 1.05 0.04
85.00 I.' O.OJ 1.05 0.0]
90,00 I.' 0.03 105 0.03
95.00 I' O.OJ 1.05 om
100,00 1.9 0.03 1.05 O.OJ
105.00 1.9 0.03 1.05 0.03
110.00 I.' O.OJ 1.05 O.oJ
115.00 1.7 O.OJ 1.05 0.03
120.00 LJ 0.02 1.05 0.02
125.1110 (@5MIN) 0.0125 1.20 0.0150
180-360 (@5MIN) 0.0056 1.20 0.0067
TOTAL IIS.7 1:_238 2.141

Table 2e: 50-Year DesiR" Storm

TIME % I-HOUR STORM AREA STORM
(MIN) !'TRAIN WfOAl)l ADJUST WIADJUST
'00 1.3 0.03 1,05 0.03
10.00 J5 ..08 1.05 0.08
15.00 '0 0.11 1.05 0.12
20.00 '0 0.18 1.05 0.19
25.00 15.0 0.J4 0.74 0.25
30.00 25.0 .56 0.74 0.42
35.00 12.0 0.27 0.74 0.20
40.00 '.0 0.18 1.0, 0.19
45.00 '.0 0.11 1.05 0.12
50.00 '.0 0.11 1.05 0.12
55.00 3.2 0.07 1.05 ..08
60.00 3.1 0.07 1.05 0.08
65.00 3.2 0.07 1.05 0.08
70.00 2.4 0.05 1.05 0.06
75.00 2.4 0.05 1.05 .06
110.00 I.' 0.04 1.05 0.04
115.00 I.' 0.04 1.05 0.04
90.00 1.4 O.OJ 1.05 0.03
95.00 1.4 O.OJ 1.05 0.03
100.00 1.4 om 1.05 0.03
105.00 1.4 O.OJ \.05 0.03
110.00 1.4 O,OJ 1.05 O.OJ
115.00 1.4 0.0] 1.05 0.03
120.00 1.4 0.03 1.05 0.01
125-180 (@5MIN) O.OO<JO 1.20 ..0000
180.360 (@5MIN) 0.0000 1.20 0.0000
TOTAL 115.6 2.601 2J68

Table 2f: 1000Year Desi~n Storm
~lME %1-HOlJR STORM AREA STORM
MrN) PT RAIN w/OADJ ADJUST W/ADnJST
'00 1.0 0.03 1.05 0.03
10.00 3. 0.08 1.05 0.08
15.00 4.' 0.12 1.05 0.13
20.00 '.0 0.21 1.05 0.22
25.00 14.0 0.37 0.74 0,27
30.00 25.0 ..66 0.74 0.49
35.00 14.0 0.37 0.74 0.27
40.00 ,.. 0_11 1.05 0.22
45.00 62 0.16 1.05 0.17
50.00 '.0 0.13 1.05 0.14
55.00 4. 0.11 1.05 0.11
60.00 4.0 0.11 1.05 0.11
65.00 4.0 0,11 1.05 0.11
70.00 2.0 0.05 l.O5 0.06
75.00 2.. 0.05 1.05 0.06
80.00 1.2 0.03 1.05 0.03
85.00 1.1 0.03 1.05 0.03
90.00 1.1 0.03 1.05 0.03
95.00 1.2 O.oJ 1.05 0.03
100.00 1.1 0.03 1.05 0.03
105.00 1.1 0.03 1.05 0.03
110.00 1.2 0.03 1.05 0.Q3
115.00 1.2 om 1.05 0.03
120.00 1.2 0.03 1.05 0.03
125.180 (@5MlN) 0.0167 1.20 0.0200
180-360 (@5MIN) 0.0083 1.20 0.0100
TUTAL 115.6 3563 J.JIlO

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Table 2g: SOO-Year Desll!;n Slorm

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TIME ~. I-HOUR STORM AREA STO~\4
(MINI PT RAIN W/OADl AOruST W/AOruST
'.00 1.0 om LOS 0.03
10.00 3.. 0.10 1.05 0.10
15.00 4' 0,15 LOS 0.16
20.00 .. 0.26 1.05 0.28
25.00 14.0 0.46 0.74 0.34
30.00 25.0 0.82 0.74 0.61
35.00 14.0 0.46 0.74 0.34
40.00 ... 0.26 1.05 0.28
45.00 6.1 0.20 1.05 0.21
50.00 '.0 0.16 1.05 0.17
55.00 4.. 0.13 1.05 0.14
60.00 4.0 0.13 1.05 0.14
65.00 4.0 0.1.) 1.05 0.14
7U.00 2.0 0.07 LOS 0.07
75.00 20 0.07 1,05 0.07
80.00 1.2 0.04 LOS 0.04
85.00 1.2 004 1.05 0.04
90.00 L2 0.04 1.05 0.04
95.00 L2 0.04 1.05 0.04
[00.00 L2 004 1.05 0.04
105.00 1.1 0.04 1.05 0.04
110.00 1.2 0.04 LOS 0.04
115.00 1.2 0.04 1.05 ..04
120.00 1.2 0.04 1.05 0,04
125-180 (@5MrN) ..0000 1.20 0.0000
18()"']60 (@5MIN) 0 1.20 0.0000
TOTAL 115.6 3.803 3.453

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