FLOOD06919

• County: Arapahoe
• Stream Name: South Platte
• Basin: South Platte
• Title: Union Avenue Boat Drop
• Date: 1/1/1983
• Prepared For: CWCB
• Prepared By: CWCB
• Floodplain - Doc Type: Easement

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DRAFT

CONTENTS. Continued

FIGURES

Page

Section through existing Union Avenue dam showing typical
reverse roller hydraulic jump ................................
Kayaker at Brown's Ditch dam boatchute
Recommended boatchute configuration . . . . . . . . . . . . . . . . . . . . . . . . . . .
Section along centerline of Union Avenue dam boatchute

(boatchute 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sections through Union Avenue dam boatchute . . . . . . . . . . . . . . . . . . . . .
Model study area ..................................... . . . . . .

Settling velocity ............................................
Model and prototype grain size distribution for bedload ..............
Union Avenue dam discharge rating curve (with boatchute) . . . . . . . . . . . .
Union Avenue dam discharge rating curve ........................
Union Avenue dam radial gate discharge rating curves

with boatchute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Englewood intake discharge curves .... . . . . . . . . . . . . . . . . . . . . . . . . . .
Boatchute 1 constructed in model - original design ..................
Boatchute 2 - original design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . : . . . .
Open bar-type barricade constructed along Englewood intake ..........
Union Avenue dam boatchute 1 narrowed with rocks ................
Boatchute 2 narrowed with rocks ...............................
Union Avenue dam modification of boatchute with single
ramp in center of chute ....................................
Section through existing spillway showing modifications with
wedge block and rockfill on downstream face ....................
Design with two ramps in center of boatchute 1 ....................
Boatchute 1 with ramp extending across boatchute,
no center trough along ramps. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Kayak proceeding through boatchute . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Boatchute 1 with trough through first ramp . . . . . . . . . . . . . . . . . . . . . . . .
Another view of first boatchute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
V-wave pallem in first boatchute ...............................
Boat proceeding through first boatchute ..........................

Boatchute 2 ...............................................
Water surface vs. discharge in pool between boatchutes I and 2 ........
Water surface elevation vs. discharge between boatchutes 2 and 3 .......
Overall view of model with final design at 1,500 ft'/s. ................
Boatchute 1 at 500 ft'ls ......................................
Boatchute 1 at 1,500 ft'/s .....................................
Boatchute 2 at 500 ft'ls ......................................
Boat going through boatchute 2 at 1,500 ft'ls ......................

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