FLOOD06794

• County: Logan
• Community: Sterling
• Stream Name: Sand Creek, Pawnee Creek
• Basin: South Platte
• Title: Floodplain Information Report
• Date: 5/1/1983
• Prepared For: Sterling
• Prepared By: CWCB
• Contract/PO #: &&
• Floodplain - Doc Type: Floodplain Report/Masterplan

LIST OF TABLES

Tablel. Peak Flows and Volumes for
Sand Creek at Pioneer Park.---------------------------- 18

Table 2. TimeofConcentrationVs. Drainage
Area for Developed Areas, Sterling, Colorado----------- 20

Table 3. Disc~arge Profiles for Pawnee Overflow----------------- 22
Table 4. Discharge Profiles for Sand Creek Flood--------..------ 23

TableS. Flood Frequency Elevation and Oischarge Data
Pioneer Drainage Ditch Profile Ster1ing,Colorado----- 26
Table 6. FloodFrequency--E1evationandDischargeOata
Sand Creek and Local Drainage Profile
Sterling, Colorado---------n--____________n__un____ 27
Table 7. Flood Frequency--Elevation and Discharge Data
Pawnee Creek Overflow Profile Sterling, Colorado------ 28
7able 8. Per Acre Flood Damages______u__________________n__n_ 61

Table 9. Average Floodwater Deoths for Reaches A Througn E
According to Land lIse------_____________nu_________h 62

Table 10. Flood Damage Calculation foe ReaCh A-------------------
Table 11. flood Damage Calculation foe Reach S-------------------
Table 12. FlOOd Oarr.age Calc:.!lation for Reach C-------------------
Table 13. Flood OalTli.lge Calculation foe Reach 0-------------------
Table 14. Flood Damage Cdlculation Foe Redch E-------------------

Table 15. Total Dal"age to All Reaches------------n--n-------___

Table 16.

Summary of Proposed New Storm Sewer Outfal1s,
?:el~e'f' L~::ez. ;).!:~ ;f:.!::k L~:::~.__--n_.~_____~n___n____

Table 17.

DischargeProfi1es for Pioneer Ditch
(with Structural Improvements)---u---------------------

Table 18. Preliminary Drainage Improvement Cost Estimatesu------ 109

Table 19. P~eliminary Cost Estimate: Pbneer Gitch Relocation
and improvements (withRiverside,PioneerPark,and
Pioneer I: Detention Str~ctures)--~--------------------

Table 20. Floodplain'" l'.i.lster Drainage Plan: O'tions.___Uh____. 117

Table 21. PerlTli.lnent Reference ~,1onuments------.n__------_____nn 118
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Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure ,.
Figure 7.
Figure 8.
Figure 9.

63

Figure

64

Figure

65
66
67

Figure

USTQFFIGURES

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Pawnee Cree~ at ColoradO Highway 14, west of
Sterling.-------------------.---.----------------------- 7

Pawnee Creek at Union Pacific/Burlington
Northern railroad tracks south of Sterling.------------- 8
Sand Creek at Pioneer Park, June 14, 1968.---.--------..- 9

Sand Creek flood waters in Charmony Addition
at Valley Drive and California Street.---------.--....-- 9
Sand Creek flood waters in '.;hitcomb Addition
at 207 West logan Street.-------------------.-.---..----10
Sand Creek floodwaters dt 7th and Broad',.-ay.------------10
Sand Creek flood waters at Pioneer Oitch
and ~jghwdy 138.---.____________________________..______11
Sand Creek Watersheds near Sterlin9. Colorado-----------13
Precipitation-Frequency Curves for Sand Creek
~atersheds near Sterling, Colorado----------------------15
lO.Three- Hour storm Design Hydrographs for Sand
Creek at Pioneer ?ark.--.----.--------------------------17

11.PeakDischargeasaFunctionofOrainagefor
Pawnee and Sand Creek Watersheds..----------------------,9

12. Reaches Affected by Flood Sand Creek and
Pawnee Creek.------------------------------------...----58

Figure 13.Per Acre Flood Oamages----------------..-------.--------59

58

Figure

14.Composite Damage Frequency Curves for ReaChes
A through E.--------------------.-.---------------------60

Figure 15.General Location of Structuresuu----------------------70
Figure 16.Flood Control dike at cemetery--------------------------71
Figure 17.Flood Control Dam at PioneerPark------------u...-.-.--72
Figure lS.Master Drainage ?lan-----------.-..--------..----------100

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