FLOOD00385

• County: Boulder
• Community: Boulder
• Stream Name: Boulder Creek
• Title: South Boulder Creek Interim Hydrology Study
• Date: 7/1/2000
• Prepared For: Boulder County
• Prepared By: Taggart Engineering Associates, Inc.
• Floodplain - Doc Type: Floodplain Report/Masterplan

I
I
I
I
I
I
I
I
I I

I
I
I
I
I
I
I
I
I
I

TABLE OF CONTENTS (Continued)

FIGURES (Continued)

Figure V-1 South Boulder Creek 100-Yr Hydrograph:
Gross Reservoir .................... . . . . . . . . . . . . . . .. V-4
Figure V-2 South Boulder Creek 100-Year Hydrograph:
Upstream Highway 93 and Confluence Comparison ........... V-5
Figure V-3 South Boulder Creek and West Valley Overflow
100-Yr Hydrograph at Highway 93 . . . . . . . . . . . . . . . . . . . . . .. V-6
Figure V-4 South Boulder Creek 100-Yr Hydrograph:
Highway 93 to US 36 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. V-7
Figure V-5 West Valley Overflow:
Highway 93 to Flatirons (CU) Levee . . . . . . . . . . . . . . . . . . . . .. V-9
Figure V-6 West Valley Overflow at Highway 93 . . . . . . . . . . . . . . . . . . .. V-10
Figure V-7 Total Stream Flow Arriving at US 36 Area. . . . . . . : . . . . . . . .. V-11
Figure V-8 Spill from SBC and West Valley Overflow
Upstream of US 36 ................................ V-12
Figure V-9 SBC from Highway 36 to the Wellman Ditch ..............'. V-13
Figure V-1 0 SBC from the Wellman Ditch Downstream ............... V-14
Figure V-11 West Valley Overflow - US 36 to Baseline. . . . . . . . . . . . . . .. V-16
Figure V-12 West Valley Overflow on Golf Course. " . .. .. . . .. . . . . . .. V-17
Figure V-13 Hydrographs Spilling from Watershed. . . . . . . . . . . . . . . . . .. V-18
Figure V-14 Eldorado Gage Data and Comparative SWMM Model. . . . . . . .. V-20
Figure V-15 Unit Discharges Mountains Above Gross Upstream
Watershed to Element 8 ............................ V-23
Figure V-16 Unit Discharges
Mountains below Gross Gross to Element 48 . . . . . . . . . . . . .. V-24
Figure V -17 Unit Discharges Foothills
Element 48 to Element 44 . . . . . . . . . . . . . . . . . . . . . . . . . .. V-25
Figure V-18 Unit Discharges Floodplain Area
Element 44 to Boulder Creek . . . . . . . . . . . . . . . . . . . . . . . .. V-26
Figure V-19 South Platte River Basin: Subregions. . . . . . . . . . . . . . . . . . .. V-27
Figure V-20 CWCB Regression - Subregion SPL-3: Central Foothills
South Platte River Basin ............................ V-28

TABLES

Table 1-1 Summary 100-Year Peak Flood Flow Hydrology Comparisons
South Boulder Creek (SBC) and West Valley Overflow (WVO) 1-11
Table 11-1' Features Directly Affecting West Valley Overflow Spillage
and Local Drainage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1I-9

iii