Published by way of the yank Geophysical Union as a part of the Water technological know-how and alertness Series.
The Deschutes is a "peculiar" dammed river in Oregon. Its dramatic juxtaposition of geology, topography, and weather provides a digital textbook of landforms and geomorphic strategies revealing Quaternary, Holocene, and extremely contemporary occasions of enormous significance. alongside the lively volcanism and tectonism, the current riverine panorama displays this episodic geomorphic historical past, as remnants of fluviatle beneficial properties, large bars and boulders, mantle the panorama. A ordinary River: Geology, Geomorphology, and Hydrology of the Deschutes River, Oregon tells a desirable tale a few "striking, occasionally intimidating, panorama that serves to query generalities and is a laboratory within which to check exact landforms and the techniques that produce them."Content:
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Additional info for A Peculiar River
Recharge from leaking canals and irrigation cause generally down ward gradients in the areas and at depths where most well data exist. The presence of deep canyons in the principal discharge area is another reason for the rarity of observed upward gradients. Because the canyons intersect the region al water table, water from the saturated zone discharges lat erally to springs in canyon walls without upward flow. Finally, few wells penetrate to depths below the elevations of streams in the principal discharge area, where upward vertical gradients would normally be expected.
1500-1900) and would have been isotopically lighter than modern pre cipitation [Naftz et al, 1996]. The data shown in Figure 8 are consistent with the water discharged at large springs being recharged at high eleva tions, along the crest of the Cascade Range and on the large volcanoes in the region. For example, Lower Opal Springs, near the confluence of the Crooked and Deschutes River, discharges water that is isotopically similar to precipitation that falls at high elevations on the Three Sisters and Newberry volcanoes, more than 5 0 km from the discharge location.
Of the 3 0 m /s (average annual rate) diverted into canals in the upper Deschutes River basin during 1994, 14 m /s leaked through canal bottoms to become groundwater recharge [Gannett et al, 2 0 0 1 ] . Most of this loss occurs between Bend and the Crooked River north of Redmond. A comparison of estimated canal loses from the early 1900s to the present with baseflow to the Crooked River, as inferred from late-season streamflow, shows that most of the water lost through leaking canals returns as spring flow to the lower Crooked River [Gannett et al, 2 0 0 1 ] .