FLOOD09461

• County: Weld
• Community: Weld-Big Thompson
• Stream Name: Big Thompson River
• Basin: South Platte
• Title: Weld - Big Thompson Community File
• Date: 1/1/2001
• Prepared For: CWCB
• Prepared By: CWCB
• Floodplain - Doc Type: Community File

1-
~.
I.
f
t
k
t
~ ,
l
^
,.
f-
~ '
LJ
!
b
Page
2.

';
,;

, '

~

~

,...

,...
....

.J
~~

y
~

i;J
:J

/'

~
I

May 23, 1975
File No. P57-75

.weld County'
Planning Director
1516 Hospital Road
Greeley, Colorado 80631

Attn: Mr. Gary Fortner
1041 Administrator

Gentlemen:

The enclosed proposal for mapping of the Flood Plain of the Big
Thompson River in Weld County is submitted in response to your request
.Y
of May 12, 1975. I have 'reviewed the requirements with Mr. Larry Laing
of the Colorado Water Conservation Board with regard to variations in
the specifications to ,best util ize the equipment we intend to use on
the project. Areas of change and additions to the specifications are
as follows: The numbers contained herein relate to the pages and
numbers of the CWCBspecification.

Page 1: Delete Section/l and add following:

TARGETING PRIOR TO PHOTOGRAPHY

A. The main stream panels (targets) dimensions shall be sized
so as t6 be,visiole,on the stereo 9"-x 9" contact prints
without'the use of sophisticated equipment. The outside
targets shall be clearly visible in the plotter and may be
targets or photo identified points. ,..

B. The procedure for placement of the main stream: panels shall
be approximately 2000' intervals along and nea'rtheriver
itself. The remaining outside panels and points shall be
placed or identified so that each photo has 6 strategically
placed points with at least 4 surveyed.points visible in
each overlapping stereo area.

C. Panels shall be rechecked prior .to flight.

D. Maximum identification of panels in the photos is a primary
consideration.

2:

AERIAL,PHOTOGRAPHY

A. & B. are deleted and the following inserted: The aerial camera
used on this project will be the Hogan and Olhausen Zeiss
RMKA4-15/23 equipped with 8 fiducial marks. The U.S.
Geological Survey Cal ibration report for the camera will be
furnished on request. Additional requirements for photographic
qual ity, overlap, etc., shall be in accordance with "Standard
i
I
,
I

..- l-
ee LcJ
C ~
(", r--
>' '/,

~,~ -.
,- ~"

~: '/ I.;
I '~: -=t
::: "

I

"
:-. ~2 ~

,." ~-
!'L ~~: z.,
'.....: ~ '---'

L.:~
;C,

/.
,.

~

,-)\
"-
')
---'\)
"

., ~r.
;::' ~c;
~ ~

~ z

. ~.' ~ ~.: ~~'
......., V) , ...
/ uJ r,
~ ::. :i t.:!:1
~ ~ 3

c.::,
tu

c

:;;
y