PERMFILE51239

• Permit No: M2001035
• IBM Index Class Name: Permit File
• Doc Date: 6/28/2001
• From: SPANN ENGINEERING LLC
• To: ACA PRODUCTS
• Media Type: D
• Archive: No

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• .

floodregress
Spann 6/24!97
Ref:
"ESTIMATION OF NATURAL STREAMFLOW CHARACTERISTIC IN WESTERN COLORADO"
WATER -RESOJRCES INL'ESTIGATIONS REFbRT BS4096
U.S. Geological Survey, Lakewood, CO
By James E Kircher. Anne F. Choquette, end Bnan D Richeter
PROJECT: Trout Creek Mean Annual Peak Flow & Gate Slze
The purpose of this study is to determine the mean annual peak Flow of project in order to size
reservoir dam release requirements to meet the water rights administration within in the basin.
+s accomplished by using the regression relations fos estimatisr the pea4c dischasges for the va
reoccurrence interval floods for the basin, plotting the peaks on probability paper then estlmatir
mean annual peak flood at the 2.33 year reoccurrence interval
According to the referenced paper, the following equation (a) is used to determine the discharc
characteristic. Each of the variables are defined according to Table 5 of the above reference.
Drainage Area in sq. mi .a := 60 9
Mean Annual preclpitaGon in inches p ;- 1 ~ o
Mean basin elevation, to feet less 5000 ft.in 1000s E ;= 3 g
Mean basin slope in fVft 5 ;= u436 ;:= t ..7
Discharge Regression Regression coefficient Mean stand-
Characteristlc Constant o1 basin cnaractenshcs and error (%)
a, := V1,:= h ; := U 3, : = ba;:= ty:=
2-yr peak 74.3 693 t if 894 51
5-yr peak 1 ; 6y8 i~ i, 719 a6
10- yr peak 6.1 .699 c) 0 635 45
25-yr peak
56 yr peak
1 5
h99
,
n
;iu
as
100 yr peak 4.9 699 it i, .-l97 44
200 yr peak yg.; .69g i, i+ .li_ 4~
103 .697 ) 0 .412 4i

Equation
(a)
Q; := a;-A ni, n
~P ~, r,3,
~E ~ w
S ,
~i = Ti _
2-yr peak 77.881 '?
5-yf peak 150.873 5
10- yr peak 208.221 1 i i
25-yr peak
50
r
eak 288 793 ~5
--
y
p
100 yr peak 353 621 sr,
200 yr peak 420.869 ];,i~ vs := IsplmeT,Q)
491979 oiu',