nono--impact: hydraulic modelingimpact: hydraulic … · nono--impact: hydraulic modelingimpact:...
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NoNo--Impact: Hydraulic ModelingImpact: Hydraulic Modeling
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Risk MAPNo-Impact/ No-Rise
A Document Used to show that a proposed project will result in “no impact” in the 1% annual chance floodresult in “no-impact” in the 1% annual chance flood and floodway elevations or floodway widths and locations
See RIV Guidance Document
Risk MAP2
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Risk MAPGeneral OverviewNo-Rise Conditions
Section 60.3 (d) (3) of the National Flood Insurance Program (NFIP) regulations states that a community g ( ) g yshall “prohibit encroachments, including fill, new construction, substantial improvements, and other developments within the adopted regulatory floodwaydevelopments within the adopted regulatory floodway unless it has been demonstrated through hydrologic and hydraulic analyses performed in accordance with t d d i i ti th t th dstandard engineering practice that the proposed
encroachment would not result in any increase in flood levels within the community during the occurrence of y gthe base (100-year) flood discharge.”
Risk MAP
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Risk MAPGeneral OverviewNo-Rise Conditions (Continued)
Prior to issuing any building grading or development permits involving activities in adevelopment permits involving activities in a regulatory floodway, the community must:• obtain a certification stating the proposed g p pdevelopment will not impact the pre-project base flood elevations, floodway elevations, or floodway d t idthdata widths.
• The certification should be obtained from the permittee and signed and sealed by a professionalpermittee and signed and sealed by a professional engineer.
Risk MAP
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Risk MAPGeneral ConditionsNo-Rise Conditions (Continued)
The engineering or “no-rise” certification must be supported by technical databe supported by technical data. • Based upon the standard step-backwater computer model utilized to develop the 100-year floodway p y yshown on the community’s effective Flood Insurance Rate Map (FIRM) or Flood Boundary and Floodway Map (FBFM)Map (FBFM)
• and the results tabulated in the community’s Flood Insurance Study (FIS).su a ce S udy ( S)
Risk MAP
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Risk MAPNo-Impact
“No Rise” “No Impact”“No-Rise” = “No-Impact”
Risk MAP
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Risk MAP
ExampleExample
Risk MAP 7
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Risk MAPProposed Project
Proposed road in the floodway and floodplain Cut and fill along a river
Risk MAP8
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Risk MAPEffective FIRM
Risk MAP9Two New Cross Sections Between G and H
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Risk MAPCross Sections14650 and 14850
Added to the effective model to create pre-project conditions modelM difi d i th j t diti d l t fl t Modified in the pre-project conditions model to reflect the proposed project cut and fill conditions
Risk MAP10
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Risk MAPCross Section 14650
Cut and Fill
Risk MAP11
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Risk MAPCross Section 14850
Cut and Fill
Risk MAP12
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Risk MAPEffective Conditions HEC-2 Input- found in warehousep
Risk MAP13
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Risk MAP
Effective ConditionsHEC-2 Input
G
H
Risk MAP14
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Risk MAP
Pre-Project GR Data
Risk MAP15
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Risk MAPPost-Project GR Data
Risk MAP16
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Risk MAPWhat to Look For . . .
Water-surface elevation increases Floodway elevation increases Floodway width increases Floodway width increases Surcharges that exceed 1.0 Negative surcharges Changes to Manning’s “n” values Reach lengths
Risk MAP17
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Risk MAPPre-ProjectConditions Output
Risk MAP18
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Risk MAPPost-ProjectConditions Output
Risk MAP19
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Risk MAPPre-ProjectConditions Output
Risk MAP20
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Risk MAPOutput Table 200
Risk MAP21
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Risk MAPThree (3) Computer Runs
Effective
Pre-Project
Post Project
Risk MAP22
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Risk MAP
Output Comparisonp p
Risk MAP23
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Risk MAP
Output Comparisonp p
Risk MAP24
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Risk MAPCommon Problems
Changes in Manning’s “n” values Changes to the floodway Surcharge values outside 0.0 to 1.0 Incorrect reach lengths
Risk MAP25
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Risk MAPNo-Impact
Project cause increases in • flood levels • floodway velocitiesfloodway velocities • floodway widths
Not a “No-Rise” andM t t S ti 65 12 (CLOMR) Must meet Section 65.12 (CLOMR)
Risk MAP26
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Risk MAP
No-ImpactHydraulic ModelingHydraulic Modeling
Questions?
Risk MAP