FLOOD01055

• County: Phillips
• Community: Haxtun
• Stream Name: North Fork Frenchman Creek
• Title: Floodplain Study and Master Drainage Plan
• Date: 1/1/1987
• Prepared For: Haxtun
• Prepared By: Simons Li & Associates Inc.
• Floodplain - Doc Type: Floodplain Report/Masterplan

1

1.

ItlTROOUCTIOH

11. Prepare a ",r1tten report ~;SClJssing all items examined in the study.

The Town of Haxtun, Colorado, has identified a storm water drainagl'
problem tnatbecOII1es apparent at certain locations in Town. Thisreportpre-
sents the results of .In analysis of the existing hydrologic and hydraulic
drainage conditions.

Summary of Data Obtained
Listedhelow is the infonnation cal1ected for use in this study:
"Precipitation ~ frequency Atlas of the Western United States, Volume III
- Colorado", National Qceanic and IItmospheric Mministration, 1973.
"Soil Survey of Phillips County", by theU. S. Department of Agriculture
$oilConservatian$ervice, 1971.
"Procedure for Determining Peak Flows in Colorado", lJ. S. Departrnentof
Agriculture,Soil Conservation Service.
4. "StormwaterManagementModel". II.S. Environmental Protection Agency. as
modified by the Urban Drainage and Flood Control District.

1.

Authorization
This study titled "Floodplain Study and Master DrainagePhn for the Town
of Haxtun", was autl10rized by the Town of Haxtun, Colorado, in cooperation
with the Colorado Water Conservation Board.

2.

3.

Purpose and Scope
The pl.rpose and scope of this study is tc analyze the existing drainage
conditions within the Town of Hdxtun, determine the existing drainage
problems, dnd develop and analyze alternative improvements to reduce the
Impacts due to flooding.
Thespecificscopeofwnr\(includesthefollowing;
1. Mel!t initially and pl!riodically with the project sponsors to insure
compliance with the services required to obtain pertinent existing infor_
mation, and to solicit therlesires of th('particlpating entit;f'S.
2. Contact other individuals or agencies who have knQl;ledge and/or interest
In the study area.
3. Conducthydrologicinvestlgatlonofoffsiteandlocal flows.

5. "Storm Orai nage Cri teri a l~anual". prepared by the Urban nrai nage and
FlocxlControlDistrict.

Mapping and Surveyin~
I\n aerial mapping (1" ~ 200') for the study are~ was provided by the Town
of Hdxt~n. The mapping is based on an d<lri al photograph made by landmark
Engineering ltd.. i n D~cember 1983. The Town of lIaxtun also provided a prell-
min~ry rlr~inage map 11" . l,aon'). TI1" U. 5. Geological SlJrvey ~udrlrangl~ map
11" = 2.000' wi th ten-foot contO<lr intervals) of Haxtlln '~est and Haxtun East,

C~1:)ra~o, WC1"0 al ~o use~.

Str~0ts e~d oth:,~ :,xisting hyd~e'J1i~ st~~ct'J~~s

4. Perf 0.,,1 hydraulic analysis for local systems within the study area.
5. Oefl ne drai nage problems and f1 ood ha~ard areas and es timate f1 ood
damages.

were field surveyed by Simons, Li Eo Associates, Inc. (SLA) in June 1986, in
order to supplement the aerial mapping, and to faci1itate the prepa ration of a
l"to?OO' p1animetric map of the Town.

7. (valuate the improvell1~nt alternatives.

Ackno.lledQ.ment;
A technical cOm:littee was established for this project to review the
progress of the study and to provide technical input for the sponsoring agcn-
des. The technical conrnitteeincluded the fo'lowing individuals:

6. O€velop improvement alternatives to reduce flooding problems. and main-
tenanccprobl€'11S r('sulting from local flooding.

8. ((amine the opl!ration and tfIaintenance aspects of the improvement alter-
natives.

Mr. Larry Lang

Chief, Floodplain Section, Col orado '~ater
Conservation Boar1
Town of H~xtlln
Colorado Water Conservation Soard
Tow~ of C1Htun

'l. Conduct ,l cost-benefit analysis.

,1r. Geof'Je Mi ch~e1
j'1r.TlrianHyde
'lr. i"lurl!1,Phillip5

to. Pr~p~ r~ prel imi nary 1 ayou t of se1 ected ill ternd ti v~.