Record Details
page 4-13
Digital Collections at BYU
| Field | Value |
|---|---|
| Title | page 4-13 Diamond Fork System Final Supplement to the Final Environmental Impact Statement, page 4-13 |
| Coverage | Electronic reproduction; |
| Format | 4-13 text/PDF |
| Rights | Brigham Young University; http://lib.byu.edu/about/copyright/generic.php Public Domain Public |
| Language | English; eng; en |
| Relation | Central Utah Project; Western Waters Digital Library; conunent letter no 10 everetts 1968 work on the little missouri river showed that in only 69 years half the floodplain flood plain was reworked by the riven river while a naturally migrating channel removes trees new trees and shrubs are reestablished by this same process however the crucial process of cottonwood regeneration was disrupted by grazing in diamond fork and sixth water as explained in a memo by a forest service team of experienced managers pathologists entomologist and ecologists to the district ranger forest service 1997 a they specifically pointed out that inadequate cottonwood recruitment in this site was related to grazing and recreational impacts and made the following statement it appears there was a period ofseveral of several decades where only minimal tree replacement was occurring this was likely related to heavier livestock browsing than is now occurring As such there is a noticeable absence 0 of f trees in the middle age classes they partially based these conclusions on fence line contrasts where heavy grazing on one side has arrested woody regeneration but on the forest service property regeneration has reinitiated initiated re after changes in grazing management similarfence similar fence line contrasts can be observed where cattle have been traditionagyfencedfrom traditionally fenced prom from the campgrounds infact inface in fact the commentors com mentors work has documented the dense under understory story within the protected parts of the campgrounds dr rood independently confirmed these assessments during his visit to diamond fork fort he suggested control of cattle and dispersed camping would be an important measure to improve riparian conditions thus while we recognize that transbasin trans transbasinflow basin flow augmentation into sixth water and diamond fork creeks accelerated channel migration it is also evident that poor regeneration of woody vegetation was in part caused by additional impacts namely livestock grazing and recreational use all of these issues will be addressed by the mitigation commission and forest service as their restoration plans for diamond fork creek are formulated however the proposed action would wouldprovide provide an important beginning by modifying the flow regimes to provide for some measure of natural restoration and an opportunity opportunityfor for ror the mitigation commission to do additional restoration failure to recognize the history extent and results of these impacts would lead to erroneous interpretation of vegetation data As a restoration plan is formulated the mitigation commission will seek advice of riparian ecologists and geomorphologists experienced with determining geomorphological and vegetative response to changingflow changing flow conditions and land management practices COMMENT COMNIENT 10.7 107 107 general riparian ecology the EIS states that the proposed flow regime will restore the riparian corridor and implies that by simply implementing a spring flood recession rate of 12 1 2 cmday caday the former floodplain flood plain will be restored through sediment deposition with subsequent cottonwood establishment this scenario ignores several key aspects of riparian ecology RESPONSE 10.7 107 107 please refer to comment response 10.5 105 105 COMMENT CONEVIENT 10.8 108 effects of sediment tr4lq transport ort on floooplain floodplain flood plain mmhology morphology and resultant species establishment potential the EIS identifies that a flow regime based on a simple recession curve with a continued duration of above normal summer flows will result in fine sediment deposition and rebuilding of the floodplain flood plain upon which cottonwood would subsequently establish data collected by the USFS as listed in gecy and gecy 1998 shows an effective discharge of approximately 200 cfs cs with large particle sediment transport occurring as low as 160 cfs cs based on this data it is unlikely that prolonged duration of flows above 160 cfs cs would result in sediment deposition and floodplain flood plain building this is important as 6.7 67 67 of the total 7.6 76 76 413 4 13 diamond fork system FSFEIS FS FEIS |
| Identifier | http://cdm15999.contentdm.oclc.org/cdm/ref/collection/WesternWatersProject/id/9721 |
