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Accession Number
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PB2013-100113
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Title
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Valles Caldera National Preserve: Hydrology. Existing Conditions Report.
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Publication Date
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2012
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Media Count
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21p
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Personal Author
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N/A
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Abstract
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Water quality is strongly influenced by surficial geology and deeper, structural elements. The temperature of some caldera stream water may be naturally warmed. Faulting controls valley and channel development, and has led to particular erosion sensitivity of certain slopes. Remnant ashflow along the footslopes of the resurgent domes and older caldera rim has secondary alluvial and landslide deposits which are particularly susceptible to erosion. The upland slopes of the caldera are connected by surface flow with the valley bottoms only through gullied swales or degraded 1st The 1935 aerial photographs show all of the present gully forms and that many were then actively scouring. These photos predate the industrial logging and road building and 1960s stock tank construction. Historic sheep grazing may have been the single most important management activity that contributed to gully starts. order draws that are entirely within the slope deposits mentioned. The possibility is raised that the extent of perennial wet valley bottoms (fens do still exist) was much greater in pre-settlement times, and surface flow on the valley bottoms was more dispersed. In general the present stream channels are in an upward trend with regards to bank stability although the process is slowed by a paucity of transported material.
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Keywords
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Channel development
Erosion
Faulting
Geology
Hydrology
New Mexico
Streams
Valles Caldera National Preserve(VCNP)
Volcanology
Water quality
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Source Agency
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Forest Service Engineering Staff Washington DC
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NTIS Subject Category
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68D - Water Pollution & Control
68G - Environmental Health & Safety
48G - Hydrology & Limnology
57H - Ecology
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Corporate Author
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Valles Caldera National Preserve, Jemez Springs, NM.
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Document Type
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Technical report
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Title Note
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N/A
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NTIS Issue Number
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1303
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Contract Number
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N/A
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