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

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IrriqationDitches
Four ditch companies operate canals ~hich traverse the st~dy area.
These i nd ude the: Spri ngda 1 e, Sterl j ng No.1, Pawnee, and ~orth Sterl i ng.
Approx imate ditch cdf>';ci ti ~s .)rc d~ fo 110'.'s:

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Capacity
(c.f.s.)
650
300
90
200

North Sterling
Pawnee
Springdale
Sterling NO. 1

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All can be expected to carry water into and out of the area during floods.
Because of the uncertainties of response of the 4 ditches, they were not
considered in the hydrologic analysiS. All of the ditches have carried
water trom the South Platte River during past flood events; therefore the
canal ernbankments are1ikely to fail evendur1ngrelativelyminorflooding.
~here a failure might occur is difficult to predict, and the effect of d
breach on the flood peak in a given watershed is likewise unpredictable.
That is, a flood peak may be i~reased as canal flows drain into the
PioneerOitch floodplain. ora peak may be reduced should floodwat ers
from above a given ditch be intercepted and diverted out ofwaterSh ed. In
either case, for thecriticallOO-year event, PNk flows from thedraiMge
area tributary to ?ioneer Ditch are of such magnitude as to make thee ffect
of ditch failures relatively small. perhaps ll!ss tMn 20 ~ercent and
should be ignored.

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