LADY BIRD LAKE WATERSHED DATA REPORT September 2019

LADY BIRD LAKE WATERSHED DATA REPORT September 2019

LADY BIRD LAKE WATERSHED DATA REPORT September 2019 The preparation of this report was prepared in cooperation with, and financed through, grants from the U.S. Environmental Protection Agency through the Texas Commission on Environmental Quality. TABLE OF CONTENTS INTRODUCTION ................................................................................................................................................ 4 WATERSHED LOCATION AND PHYSICAL DESCRIPTION ...................................................................................... 5 Location and Climate .................................................................................................................................... 5 Physical Description and Land Use (City of Austin) ........................................................................................ 5 History ......................................................................................................................................................... 5 Lower Colorado River Authority: Colorado River Watch Network ................................................................. 6 Water Quality Impairments .......................................................................................................................... 6 Wastewater Treatment Facility Discharge .................................................................................................... 6 Wastewater Protection Department, City of Austin ...................................................................................... 7 Algal Blooms and Lady Bird Lake................................................................................................................... 7 Endangered Species and Conservation Needs ............................................................................................... 8 WATER QUALITY PARAMETERS....................................................................................................................... 11 Water Temperature ................................................................................................................................... 11 Dissolved Oxygen ....................................................................................................................................... 12 Specific Conductivity and Total Dissolved Solids ......................................................................................... 12 pH .............................................................................................................................................................. 13 Secchi Disk and Total Depth ....................................................................................................................... 13 E. coli Bacteria ............................................................................................................................................ 13 Orthophosphate ......................................................................................................................................... 13 Nitrate-Nitrogen......................................................................................................................................... 14 Texas Surface Water Quality Standards ...................................................................................................... 14 DATA ANALYSIS METHODOLOGIES ................................................................................................................. 15 Data Collection ........................................................................................................................................... 15 Processes to Prevent Contamination ...................................................................................................... 15 Documentation of Field Sampling Activities ............................................................................................ 15 Data Entry and Quality Assurance............................................................................................................... 16 Data Entry .............................................................................................................................................. 16 Quality Assurance and Quality Control ................................................................................................... 16 Data Analysis Methods ............................................................................................................................... 17 Standards and Exceedances ................................................................................................................... 17 Methods of Analysis ............................................................................................................................... 17 1 | P a g e LADY BIRD LAKE WATERSHED DATA ANALYSIS ................................................................................................ 19 Lady Bird Lake Maps ................................................................................................................................... 19 Lady Bird Lake Watershed Trends over Time .............................................................................................. 20 Sampling Trends over Time .................................................................................................................... 20 Trend Analysis over Time............................................................................................................................ 20 Air and Water Temperature ................................................................................................................... 20 Total Dissolved Solids ............................................................................................................................. 21 Dissolved Oxygen ................................................................................................................................... 22 pH .......................................................................................................................................................... 23 E. coli Bacteria ....................................................................................................................................... 24 Nitrate-Nitrogen..................................................................................................................................... 25 LADY BIRD LAKE WATERSHED SITE BY SITE ANALYSIS ...................................................................................... 27 Site 15955 – Town Lake Below Tom Miller Dam.......................................................................................... 32 Site Description ...................................................................................................................................... 32 Sampling Information ............................................................................................................................. 32 Air and Water Temperature ................................................................................................................... 32 Total Dissolved Solids ............................................................................................................................. 33 Dissolved Oxygen ................................................................................................................................... 34 pH .......................................................................................................................................................... 35 E. coli ..................................................................................................................................................... 36 Nitrate-Nitrogen..................................................................................................................................... 37 Site 80229 – Town Lake Upstream of South 1st Street @ Stevie Ray Vaughn Statue .................................... 38 Site Description ...................................................................................................................................... 38 Sampling Information ............................................................................................................................. 38 Air and Water Temperature ................................................................................................................... 39 Total Dissolved Solids ............................................................................................................................. 40 Dissolved Oxygen ................................................................................................................................... 40 pH .......................................................................................................................................................... 41 E. coli ..................................................................................................................................................... 42 Nitrate-Nitrogen..................................................................................................................................... 43 Site 80326 – Town Lake @ West Bouldin Creek .......................................................................................... 44 Site Description .....................................................................................................................................

View Full Text

Details

  • File Type
    pdf
  • Upload Time
    -
  • Content Languages
    English
  • Upload User
    Anonymous/Not logged-in
  • File Pages
    66 Page
  • File Size
    -

Download

Channel Download Status
Express Download Enable

Copyright

We respect the copyrights and intellectual property rights of all users. All uploaded documents are either original works of the uploader or authorized works of the rightful owners.

  • Not to be reproduced or distributed without explicit permission.
  • Not used for commercial purposes outside of approved use cases.
  • Not used to infringe on the rights of the original creators.
  • If you believe any content infringes your copyright, please contact us immediately.

Support

For help with questions, suggestions, or problems, please contact us