Analysis of Colorado-Big Thompson Project Operation With Respect to East Slope Diversions and Non-Charge Deliveries

• Description: For the River Colorado Water Conservancy District
• State: CO
• Basin: South Platte
• Basin: Colorado Mainstem
• Water Division: 1
• Date: 10/1/2000
• Author: Helton & Williamsen, P.C.
• Title: Analysis of Colorado-Big Thompson Project Operation with Respect to East Slope Diversions and Non-charge Deliveries
• Water Supply Pro - Doc Type: Report/Study

CONTENTS
EXECUTIVESUMMARY .............................................................................. ..............................1
INTRODUCTION.......................................................................................... ..............................4
PROJECTBACKGROUND .......................................................................... ..............................5
EastSlope Facilities .............................................................................. ..............................5
EastSlope Water Rights ....................................................................... ..............................7
HistoricalOperation ............................................................................... ..............................7
DIVERTIBLE BIG THOMPSON RIVER WATER ......................................... .............................10
OPERATION OF EAST SLOPE FACILITIES TO MAINTAIN HISTORICAL C -BT YIELD........ 13
WESTSLOPE EFFECTS ............................................................................ .............................15
CONCLUSIONS.......................................................................................... .............................17
Tables
(following text)
Title
1
Pertinent Data Summarizing the C -BT Project's East Slope Water Rights
2
Alva B. Adams Tunnel at East Portal
3 -A
End -of -Month Contents — Carter Lake
3 -B
End -of -Month Contents — Horsetooth Reservoir
3 -C
End -of -Month Contents — Carter Lake and Horsetooth Reservoir Combined
4
Water Delivered to C -BT Project Users
5
Non - Charge Water Delivered to C -BT Project Users
6
Annual Summary of C -BT's Big Thompson River Operations
7
Native Water That Was Excess to Existing Water Rights and Potentially
Divertible by the C -BT Project
8
Native Water That Could Have Been Diverted into the Olympus Tunnel
9
Additional Native Water That Could Have Been Diverted into the Dille
Tunnel
10
Native Water That Could Have Been Diverted into the Olympus and Dille
Tunnels
11
Derivation of Undiverted Non - Charge Water — Big Thompson River
12
Historical and Simulated Adams Tunnel Diversions — Water Years 1983-
1998
13
Effects of Increased East Slope Diversions and the Non - Charge Program