FLOOD06302

• County: Logan
• Community: Sterling
• Stream Name: Pioneer Drainage Ditch
• Basin: South Platte
• Title: Proposed Near-term Improvements and Operation of Pioneer Drainage Ditch
• Date: 7/1/1988
• Prepared For: Sterling
• Prepared By: Charles F. Leaf, PE
• Floodplain - Doc Type: Project

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19

It is emphasized that the proposed improvements will not mitigate damage
caused by regional flooding from Sand Creek and the Pawnee Overflow. Nor
will they mitigate local flooding resulting from deficiencies in the existing
storm sewer and drainage system. The drainage improvements recommended
in the Master Drainage Plan must be made in addition to the near-term
Ditch improvements to significantly reduce these problems.

CONCLUSIONS

Systematic upgrading of all inadequate crossings in the Pioneer
Drainage Ditch and construction of a detention structure at North Division
Avenue will significantly reduce flooding -(1"6mlocally generated storm runoff.
These near-term improvements will el iminate overflows where they now occur
and reduce peak flows and associated backwater flooding between North
Division Avenue and Highway 138.
As undeveloped areas south of Iris Drive and west of the Pioneer
Drainage Ditch are urbanized in the future, the increased peaks and runoff
volumes will have a significant adverse impact on the lower Ditch even
with the proposed near-term improvements.
As these areas are annexed, preventive controls should be placed on
development such that future-condition ten-year peaks and volumes cannot
exceed present condition peaks and volume. Similar preventive controls
should be imposed on large commercial or equivalent developments south
and east of the Ditch using design criteria that are consistent with the
Master Drainage Plan.