HomeMy WebLinkAboutSpecial 2011-05-11 Shoreline Master Program - Comparison Matrix - Attachment B: Summary of Buffer Widths ATTACHMENT B
Table3. Summary of Buffer Widths for Land Use Zones and Shoreline Ecological Conditions
Area Characteristics Environment Buffer Modification
MIC/H MIC/L Fresh/Salt eater High Intensity- 100' The Director play reduce the standard buffer on a
Zoned property Transition Zone, Lower case -by -case basis by up to 50'% upon
from North City- flooding risk, Less than construction of the following cross section:
Limits to EMWS 20' difference from L reslope bank from OHWM (not toe) to
Bridge, and OHWM to top of bank, be no steeper than 3:1, using bioengineering
North Potential tidal influence techniques
Annexation Area 2. Minimum 20' buffer landward from top
of barilz
3. Bank and remaining buffer to be planted
with native species with high habitat value
Comment: Maximum slope is reduced due to
measurement from OHWM and to recognize
location in the Transition Zone where
pronounced tidal influence makes work below
OHWM difficult.
Any buffer reduction proposal must demonstrate
to the satisfaction of the Director that it will not
result in direct, indirect or long -term adverse
impacts to the river. In all cases a buffer
enhancement plan must also be approved and
implemented as a condition of the reduction.
The plan must include using a variety of native
vegetation that improves the functional attributes
of the buffer and provides additional protection
for the shoreline ecological functions.
LDR Zoned Moderate flooding risk, Shoreline Distance Removal of invasive species and replanting with
property w/o Less than 25' difference Residential required native species of high habitat value voluntary
lei ees from from OHWM to top of to set unless triggered by requirement for a Shoreline
EMWS to I -40S bank, tidal influence on back Substantial Development permit
northern section slope
from toe
at 2.5:1
plus 20'
setback,
Min. 50'
width
LDR Zoned Moderate flooding risk, Shoreline 125' Upon reconstruction of levee in accordance with
property with Less than 25' difference Residential minimum profile, the Director may reduce the
levees from from OHWM to top of buffer to actual width required.
EMWS to I -405 bank, tidal influence on Comment: this applies to City -owned property at
northern section Fort Dent.
Commercially- Moderate flooding risk, Urban 100' The Director may reduce the standard buffer on a
zoned property Less than 25' difference Consen -ancy case -by -case basis by up to 50% upon
from 42"" Ave S. from OHWM to top of construction of the following cross section:
Bridge to 1 -405 bank reslope bank from toe to be no steeper
than 2.5:1 using bioengineering
techniques
Mirlinmum 20' buffer landward from
top of bank
Bank and remaining buffer to be
planted with native species with high
habitat value
CL Page 1 of 04,'2.9'2011 3:io P1\1
W: Lug Range Projects Shoreline Ecology Review adopted SNIP attachment B -Table 3
ATTACHMENT B
Table3. Summary of Buffer Widths for Land Use Zones and Shoreline Ecological Conditions
Area Characteristics Environment Buffer Modification
Any buffer reduction proposal must demonstrate
to the satisfaction of the Director that it will not
result in direct, indirect or long -tern adverse
impacts to shoreline ecological fimctions. In all
cases a buffer enhancement plan must also be
approved and implemented as a condition of the
reduction. The plan must include using a variety
of native vegetation that improves the functional
attributes of the buffer and provides additional
protection for the shoreline ecological fimctions.
West River bank High flooding risk, Urban 125' Upon construction or reconstruction of levee in
from I -405 to Federally- certified and Consei ancy- accordance with City- minimum profile the
South City Limit, County levee, large Director may reduce the buffer to the actual
Tulm 205 water level fluctuations width required. In no case shall the buffer be less
Levee and South than 50 feet.
Annexation Area
East River bank Moderate flooding risk, Urban The Director may reduce the standard buffer on a
without levee 20 to 25' difference Consen -ancy 100' case -by -case basis by up to 50% upon
from I -405 south from OHWM to top of construction of the following cross section:
to City Limits bank, Moderate 1. reslope bank from toe to be no steeper
slumping risk, large than 2.5:1, using bioengineering techniques
water level fluctuations 2. Minimum 20' buffer landward from top
of bank
3. Bank and remaining buffer to be planted
with native species with high habitat value
Any buffer reduction proposal nest demonstrate
to the satisfaction of the Director that it will not
result in direct, indirect or long -tern adverse
impacts to shoreline ecological fimctions. In all
cases a buffer enhancement plan nest also be
approved and implemented as a condition of the
reduction. The plan nest include using a variety
of native vegetation that improves the fimctional
attributes of the buffer and provides additional
protection for the shoreline ecological fimctions.
East River bank Moderate flooding risk, Urban 125' Upon reconstruction of levee in accordance with
with levee from 20 to 25' difference Consei ancy City- mininnun profile the Director may reduce
I -405 to South from OHWM to top of the buffer to the actual width required for the
Cite Limit bank, Moderate levee. In no case shall the buffer be less than 50
slumping risk, large feet,
water level fluctuations
Any shoreline End buffer on river side of existing improved
envirolunent street or roadwai
where street or
road rues parallel
to the river
through the
buffer
CL Page 2 of 04,'2.9'2011 3:SO P1\1
W: Long Range Projects Shoreline Ecology Review adopted SNIP attachment B -Table 3