Record Details
page 1-33
Digital Collections at BYU
| Field | Value |
|---|---|
| Title | page 1-33 Final environmental impact statement on the Provo River Restoration Project, page 1-33 |
| Coverage | Electronic reproduction; |
| Format | 1-33 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; 15.2 152 Flood floodplain jbloodplain plain features A key component of the meandering riffle pool channel charmel design is sizing the cross section so flows spill into the floodplain flood plain on about an every other year basis this would benefit channel stability and the surrounding riparian corridor the floodplain flood plain interaction would be accomplished by selecting channel dimensions to convey approximately 1200 cfs cs the peak flow that has a recurrence interval of 1.5 15 15 years river flows would spill into the floodplain flood plain when this flow is exceeded the surrounding area would be selectively contoured to create a floodplain flood plain where necessary every effort would be made during final design to minimize the amount of off channel grading required to establish contact between the channel and the floodplain flood plain grading would disturb the vegetation and topsoil in the riparian corridor and would be avoided where practical graded areas would be restored to riparian vegetation types in the PRRP corridor vegetation consistent with natural wetland riparian or upland areas would be established in areas that the federal governm governa government would acquire for the project the old channel would be incorporated as the floodplain flood plain for the restored channel in some areas this would be accomplished by only partially backfilling the old channel where it lies hes iles on the inside of new channel bends the restored channel would be aligned away from historical terraces and river bed slopes would be varied in the riffle and pool sequence to minimize the need for grading the transition between the channel and the floodplain flood plain on the inside of the bends would be subtle the point bars would be sloped up to the floodplain flood plain on a gentle slope that is consistent with those measured in similar natural channels this would encourage initial channel overflows to occur on the inside of river bends and promote more extensive riparian vegetation development on the point bars and within the area of construction disturbance ie meander belt the meandering channel with a connected reconnected re floodplain flood plain in the proposed action offers opportunities for incorporation of several desirable floodplain flood plain features including wetlands ponds side channels and setback dikes 1 152.1 1521 1521 L 521 52.1 521 wetlands and ponds project plans call for creation of a variety of wetland types interspersed within the core area and expanded restoration area the mitigation commission identified eleven wetland subtypes sub types that would provide habitat diversity needed to support a rich biological community table 11 1 1 lists the wetland subtypes figure 15 1 5 displays several of the wetland subtypes as they might be constructed under the proposed action designers would select suitable locations for these features and would base their selections on topography construction impacts costbenefit cost benefit wildlife needs other landscape features and desired riparian vegetation condition the proposed action includes between five and ten new ponds located within the core area and expanded restoration areas the ponds would provide a combination of emergent marsh and deep open water habitats that would add considerable habitat diversity to the project aside from the constructed jordanelle Jor danelle wetland cells the only significant floodplain flood plain ponds in the river corridor are condie berkenshaw and hogle in addition eight small ponds would be constructed four in reach 7 and four in reach 9 to provide over wintering habitat for spotted frogs ponds would be excavated to accommodate a water depth ranging from 10 to 15 feet this depth would be required to minimize the growth of aquatic weeds and limit the freezing depth to maintain adequate year round fish or amphibian habitat the pond sizes and shapes would vary depending on available land and surrounding topography these features would be blended to their surroundings and give them a natural appearance in most cases water would be supplied to the ponds from the provo river through open channels A secured water right for these features would probably be required an inlet and outlet would be constructed at each pond to provide flow through of the water in some cases water may be available from natural springs or groundwater if necessary ponds would be sealed by one or more methods to reduce water loss through infiltration lining alternatives include compaction of granular soils and application and tilling filling of bentonite in the event some ponds are excavated to a depth that intercepts the groundwater table no liner would be required spoil from pond construction would be disposed of in the same manner as spoil from |
| Identifier | http://cdm15999.contentdm.oclc.org/cdm/ref/collection/WesternWatersProject/id/8674 |
