FS9902-CS 990318Morrison Hydrology Engineering, Inc.
210 Arnold Ave ~ Arlington, Texas 76010
Maro (817) 461-0321 Fax (817) 274-1338
E-Mail: ronmor7777(~aotcom
March 18, 1999
Mr. Kenneth M. Grilrva, P.E.
City Engineer
City of Coppeal
255 Padaray Bb~L
P.O. Box 478
~ Texas 75019
Off 214-304-3679
Metro 214-471-2251
Fax 214.304 3673
ReviewCommenlsforCLOMRandCDCSul~itlnlfotaPtojectSoufitdBelaineRoadinfite
City of Collpell, Texas
Dear Mr. Griffin:
This letter is in response to the r~view letter f~om Kiml~y Horn and As~ciates, Inc. (atlache~ regtrding
the subject proj~t. Thefo!lowingresponsestelat~the~a:hcommeatinth=t~vi~wletleE
1. Therepottwepn~lam~disfotacouBlionalal~Fn~atloffillandaonthesiteandhasm~hing
2. Attaclm~ntltothisleltercon~ain~largerscalema.~ofthee~stingandln'~ed~!~iitio~
3. Manning'snvalueswereincludedinth~nloddusingthe'ltodzmilalDistsnl~"(Nlt)n!lthod-
Attachment 2 shows the Manning values andcommenls tegatdinE these values-
this malntenancc. The results &-'p~nd on whether an agrceatent is mad~ with the ciW for a ~Jogging
5. We en~dtl~modd23 mil~s ugaEam ofout ptuiai- At that l~u~tth~!~aPos~d 100-year(ultimate
flow) ~uoa~in vrt .o~ fm (o.24 im~) ~n~thm me~isti~c~.~i~ (~)
changestothefioodVtainu!~unofthisiocafion-
6, We conlacled Mr, Monsl~ofl~chadBaln:tEngineenefA!eaastlria~nginia(FEMA
TechnicalEng~neerinc!~l~ofthereviewof!~e(IOMR) ami he leld us that the fm'ms ~ used
would be accep~Ne.
Morrison H. Vdtology Engineering,
Page -2
All HEC2 models were sent to the cit~ aad included in FEMA nl~ort subntitted to fl~e cily oa a 3.5
inch disk
Together wilh the overbank swale, the slotage ~on Ixmd identified in this rel~oa is required
larger ana pond will be necessary, Thisisoncofthercasonswhyacomfnionalnl~rtis!~cpared.
CDC
betw~ seaions 100040 and 103060.
Ronald W. Monison, P.E., C.F.M.
Senior Hydrologist
---..,
;: ~ I
I
~s ~ I I
ITI I ~ e
>< i ~ I
- o ~ I
en
-i ~
- c
~ Z t-<
G') C
.... c;":l
i! ~ "'<
E: (') 'I ~
0 g ~
z
0 ! ~
.... ~
!3~ .....
! ~
~ .
I
I
I
----.
-----
ITI
><
-
en
I ~
-
I Z
I G>
()
f 0
I Z
C
-
-i
-
0
Z
...........-
I
I
I
---..,
00
I 1m
~ I
I Ul ~p
I C)
I
I
I~
.
~
I Q I
I
1'1
-
.
--...
I
I
en ~~ I
~
~ ~~ ~ I I
~z ;0
00 I
::. .?:s
II
~ "'C ~ I I
0 ;C a I
c
0 ..oJ ~
01
0
"'C ~ ~
0
0 t;
Cf)
m ;0
a
[Xl 0 t'-ot
~ a
......
AJ () 01 ~
~
:::e ~[5j "-<:
s::: 0
e~ ~
10
0
I
I I I
I I
I
I
t I
I
I
~
I
- I I
I
Ic(!~ ~
I ~
i 0
I
(J I I "'C
I ;:0
I i I 0
I "'C
I 0
C/)
I fTI
I f 0
I (')
0
Z
0
-
-i
-
0
Z
I
I
--..,
470
ELM FORK TRINITY RIVER
Cross-Section
><
450 -
440 -
430 -
j/0
,_ROP
~XIST
420 -
410
3705 4305 4905 5505 6105
~ridge
-- -CWSEL 1
Distance (Ft)
6705
--Ground Section
7305
Banks
7905
ATTACI,ItlI~T !