FLOOD10485

• County: Arapahoe
• County: Douglas
• Stream Name: Big Dry Creek
• Basin: South Platte
• Title: Big Dry Creek ‎(Arapco)‎ & Tributaries - Major Drainageway Planning - Phase B Preliminary Design Report
• Date: 4/1/1998
• Prepared For: Arapahoe County, Douglas County, Englewood, Greenwood Village, Littleton, UDFCD
• Prepared By: WRC Engineering, Inc.
• Floodplain - Doc Type: Flood Mitigation/Flood Warning/Watershed Restoration

Page No.
I-I
III-2
III-I 2
II1-18
1lI-23

LIST OF FIGURES
Figure I-I Study Area
Figure III-I(A-C) Watershed Map
Figure 1lI-2(A-C) SWMM Routing Elements
Figure III-3(A-D) Typical RunoffHydrographs
Figure II1-4(A-C) Peak Flow Diagrams

Page No.
III-5
III-6
III-6
III-I6
1lI-17
III-I 7
IIl-21
V-6
VI-6
VII-7
VII-8
VIT-9
VII-IO
VIl- I 2

LIST OF TABLES
Table III-I Two-hour Design Storm for Basins Between Five and Ten Square Miles
Table III-2 CUHP Sub-Watershed Parameters
Table III-3 SWMM Routing Element Parameters
Table III-4 Peak Runoff Comparisons
Table 1II-5 Peak Runoff Comparisons - No Detention
Table III-6 Sub-Watershed Peak Flow Summary
Table III- 7 Summary of Peak Flows
Table V-I Bridges/Culverts Existing Capacities
Table VI-I Recommended Alternative Selection
Table VII-I Unit Cost Data
Table VII-2 Total Drainage Improvement Costs Summarized by Sheet
Table VII-3 Total Drainage Improvement Costs Summarized by Jurisdiction
Table VII-4 W atershed- Wide Improvement Prioritization
Table VIl-5 Improvement Prioritization by Jurisdiction

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