CHL will be closed June 30th- July 4, 2025. Operations will resume on July 7, 2025.

Crawford Hydrology Lab
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    • Home
    • About Us
    • Services
    • Store
    • Contact
    • Resources
      • Technical Information
      • Dye Tracing FAQs
      • Training
      • Research Grant Program
      • Research Fellowship
Crawford Hydrology Lab
  • Home
  • About Us
  • Services
  • Store
  • Contact
  • Resources
    • Technical Information
    • Dye Tracing FAQs
    • Training
    • Research Grant Program
    • Research Fellowship

Resources

SUMMER LAB CLOSURES

CHL is getting a facelift! Renovation to update our facilities starts soon, 

please see details below.


 The lab will be closed on June 19th and June 30-July 4, 2025

Supply orders and sample analysis will not be available while the lab is closed.


Please note the following sample receipt deadlines to ensure lab reports are delivered before the extended closure: 

 7 business day TAT - 3:30 pm on Wednesday, June 18, 2025  

(Standard analysis rates)  

        4 business day TAT- 3:30 pm on Monday, June 23, 2025           

 (50% analysis surcharge)

        48-hour TAT-3:30 pm on Wednesday, June 25, 2025             

        (100% analysis surcharge)


technical information

Image of fluorescent dye used in groundwater tracing by Crawford Hydrology Lab in Bowling Green

Chain of Custody

Downloadable Chain of Custody form required for sample check-in.

Sample Shipping Recommendations

Check out these Shipment Recommendations to ensure your samples arrive in excellent condition.


IMPORTANT NOTICE! If shipping samples via USPS please use University address: 1906 College Heights Blvd., Bowling Green, KY 42101. Only UPS and FEDEX will deliver directly to our physical location. 

Dye Tracing 101

Step-by-step Dye Tracing Instructions for field activities. 

Karst Groundwater Investigation Research Procedures

Detailed Research Procedures for groundwater investigations in karst environments.

CHL Statement of Qualification

Expanded information about our staff, services, and clientele.

Safety Data Sheets for Fluorescent Tracers

Fluorescein dye injection into a sinking stream. #dyetracing #groundwater #karstcavereasearch #tests

Tinopal CBS-X  (Optical Brightner)

Pyranine (Solvent Green 7)

Fluorescein    (Sodium fluorescein, Acid Yellow 73)

Eosine OJ   (Acid Red 87) 

FD&C Red 3 

D&C Red 28  

Rhodamine WT  (Acid Red 388)

Rhodamine WT for Water Tracing Fact Sheet

Sulphorhodamine B  (Acid Red 52)

Crawford Hydrology Laboratory

1500 State Street, Suite 304, Bowling Green, Kentucky

Call: 270-745-3458 OR 270-745-9224

Copyright © 2025 Crawford Hydrology Laboratory - All Rights Reserved.

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