Hi Brian -- thanks for posting to History Hub!
I checked our finding aids for the records of the House in the 67th Congress and see no indication of audiovisual material in the records of the Committee on Irrigation of Arid Lands. However, I can't confirm that until we look for a bill file for H.R. 11449. If you can email firstname.lastname@example.org we'll add your request to our queue.
Generally I want to let you know that we rarely have audiovisual material in our holdings. You can find more background in a blog post we wrote on locating congressional hearing videos.
You can also contact Imperial Irrigation District directly. They have an email for Records Management.
Thank you for your efforts. IID responds that they do not have it. Pioneer Museum in Imperial County may have it, but they are closed due to Covid-19.