9626

• UCREFRP Catalog Number: 9626
• Author: Butler, D. L.
• Title: Effects of Piping Irrigation Laterals on Selenium and Salt Loads, Montrose Arroyo Basin, Western Colorado.
• USFW Year: 2001.
• USFW - Doc Type: Denver, CO.
• Copyright Material: NO

CONTENTS
Abstract ..................................................................................................................................................................................
1
Introduction ............................................................................................................................................................................
1
Montrose Arroyo Demonstration Project .................................................................................................................... 4
Monitoring Program and Method of Analysis ............................................................................................................. 4
Effects of Project on Selenium and Salt Loads ...................................................................................................................... 9
Factors Affecting Selenium and Salt Loads ........................................................................................................................... 12
Summary ................................................................................................................................................................................
13
References Cited ....................................................................................................................................................................
14
FIGURES
1-2. Maps showing:
1. Location of the lower Gunnison River Basin and study area ............................................................................ 2
2. Study area and sampling sites ........................................................................................................................... 5
3-5. Graphs showing:
3. Comparison of selenium loads in Montrose Arroyo Basin before and after the lateral project ........................ 9
4. Selenium loads in Montrose Arroyo at Niagara Street (MA2), 1993-2000 ..................................................... 10
5. Comparison of salt loads in Montrose Arroyo Basin before and after the lateral project ................................. 11
TABLES
1. Mean streamflow, selenium concentrations, and salinity concentrations for irrigation-season
(April through October) and nonirrigation-season (November through March) samples at the
five monitoring sites ................................................................................................................................................ 6
2. Mean selenium and salinity concentrations in irrigation water from the AM lateral and Loutzenhizer Canal,
1999-2000 ............................................................................................................................................................... 7
3. Mean selenium and salt loads for irrigation-season (April through October) and nonirrigation-season
(November through March) samples at the five monitoring sites ........................................................................... 7
4. Selenium loads for the Montrose Arroyo demonstration project ............................................................................ 8
5. Salt loads for the Montrose Arroyo demonstration project ..................................................................................... 8
CONTENTS iii