ABSTRACT:

The hydrogeology of volcanic terrain exhibits characteristics that reflect both a legacy of volcanic construction and transient evolution of bedrock hydraulic conductivity on million year timescales. Here we study a drainage basin in the Central Oregon High Cascades in which Holocene lava flows dammed streams, creating seasonal lakes that fill with the spring snowmelt, and drain completely over the summer. The filling and draining of these lakes depends both on the volume of snowmelt and the permeability of their porous lava dams, providing a natural experiment for disentangling multiscale hydraulic properties from climate. We measure the drainage of two seasonal lakes in the watershed of permanent Clear Lake (the highest elevation permanent source of the McKenzie River) with in situ sensors and satellite remote sensing, and compare this with the larger scale summer recession of the McKenzie river at the outlet of Clear Lake. Clear Lake recession is modeled with 2 parallel linear reservoirs, which are linked to aquifer properties and imply watershed scale transmissivity that varies with spatial scale of the aquifer. We also find, using remote sensing-derived timeseries, that all three systems, but particularly the draining lakes, have responded to declining snowpack since 1990. These results suggest that seasonal variations in surface water storage encode the structure of volcanic aquifers generally, and can be used to infer groundwater dynamics in the Cascade Range.

The resource represents Hobo pressure-temperature data and Planet remote sensing data for Lost Lake and Fish Lake.

ABSTRACT:

This is the GIS data for our 2025 Summer Institute Project: "Estimating Flood Inundation Using a Densified Stream Network in Travis County, TX."

We'd like to thank Dr. David Maidment, Dr. Matt Bartos, and Dr. Dean Djokic for assembling most of the data in this resource. They can be found at these hydroshare links:
Maidment, D. (2025). Theme 4 Data Revised, HydroShare, http://www.hydroshare.org/resource/c95e654312204ce0b4d8e31e71cd4354
Maidment, D. (2025). Dean Djokic Material, HydroShare, http://www.hydroshare.org/resource/23aa7866ab614687811bb70ffb13fcfe
Maidment, D. (2025). DEM for Shoal Creek and Waller Creek Catchments, HydroShare, http://www.hydroshare.org/resource/edcf0088e4c04ec888498d2854386416

Code for our analysis can be found here:
https://github.com/oladojavictor/DensiFIMcation