FLOOD02508

• Designation Number: 292
• County: Adams
• Community: Westminster
• Stream Name: Big Dry Creek
• Basin: South Platte
• Title: Flood Hazard Area Delineation - Bruchez Farms Property, Big Dry Creek at Wadsworth Parkway
• Date: 1/1/1988
• Designation Date: 3/1/1988
• Floodplain - Doc Type: Floodplain Report/Masterplan

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20

ADDITIONAL HEC-2 RUNS

Additional runs were made of the HEC-2 model using the peak discharge rates and

elevations determined from the HEC-l runs using the Improved Inlet and/or the

storage available upstream of the railroad culvert. This was done to determIne the

effects of these reduced discharges and elevations on the water surface profiles on

the Bruchez property.

These results Indicate that for all of the combinations of storage, wIth and without

the improved Inlet, the reduction in elevation Is such that most of the Bruchez pro-

perty Is removed from the floodplaIn. The revised water surface profile and flood-

plaIn based on the results of thIs study, using MIY the temporary storage withIn the

floodway and no Improvements to the Inlet to the railroad culvert, are shown on the

drawings at the back of this report.

The HEC-2 runs indicate that the effects of the Improved Inlet do not extend

upstream of Wadsworth Parkway when the effects of storage are also Included;

therefore, there Is no need to make the Improvements to the railroad culvert.

"ASTER PLAN I"PROYE"ENTS

Just before the conclusion of this study, another piece of Information was brought

to our attention by Kevin Stewart of the UD&FCD. They had just received the pro-

posed Master Plan for Big Dry Creek.

This plan proposes adding four 12o-Inch reinforced concrete pIpes to the existing