Board Of Aldermen

July 11, Hillsbarou | No FEMA FEM
3, | 1973 gh County | historic Disaster Decl
N data on Declaratio on
extent n #399. Datz
, Ho
HME
201%
z/ | 1981-02- Statewide | No Heavy 50000 134418.72 ; 0.47 SHE!
11 - 1981- historic Rains &
h | 02-12 data on Ice Jams
extent
1984-05- Southern No Flood $3333.33 196000.33 | 0.66 SHEI
z 29 -1984- | and historic
° 06-03 Central data on
NH extent
1986-01- Statewide | No Flooding 50000 111484.14 | 0.35 SHEI
2 | 26-1986- historic
01-27 data on

weather.

than
1785
flood.

uM

1927

Hillsboro
ugh
County

No
historic
data on
extent

Damage
to road
network.

Nast
HME
201:

we

March
11-21,
1936

Hillsboro
ugh
County

25-50
year
recurrenc
e interval

vazard events are included that occurred outside of the region but caused impacts to Nashua. Examples include tropical and post-trc
2s where the eye did not pass through Nashua but the wind and rain fields impacted the City and earthquakes where the epicenter |
een located far away but shaking was felt in the City.

supply system. e D—100-299 acres Impacts to air quality.

@e E—300 to 999 acres

e F—1,000 to 4,999 acres Impact to roadways.

e G—5,000 to 9,999 acres

e H—10,000 to 49,999 Loss of natural resources.
acres

e I—50,000 to 99,999 Potential for urban
acres conflagration.

e J—100,000 to 499,999
acres

e K—500,000 to 999,999
acres

@ {—1,000,000+ acres

positioning, intelligence
gathering, and weather
forecasting.

al and Post-Tropical
es

Entire jurisdiction.

Saffir-Simpson Hurricane Wind
Scale:
e Category 1—sustained
winds 74-95 mph
e Category 2—sustained
winds 96-110 mph
® Category 3—sustained
winds 111-129 mph
® Category 4—sustained
winds 130-156 mph
e Category 5—sustained
winds 157 mph or higher

Wind damage to Structures anc
trees.

Water damage to structures an
their contents.

Winter Weather

Entire jurisdiction.

Depth of snow in a given time
frame (ex. 2 or more inches per
hour over a 12 hour period).

Blizzard—violent snowstorm
with minimum winds of 35 mph
and visibility less than % mile for
3 hours.

Ground snow load factor.

Ice Storm—Sperry-Piltz Ice
Accumulation Index:
@ O-—little impact
e 5-—catastrophic damage
to exposed utility
systems

For full definitions of Sperry-Plitz
Ice Accumulation Index, see
Section 3.5 Vulnerability by
Hazard

Large-scale incidents of food or
water contamination.

Extended periods without
adequate sanitation services.

Possible quarantine to prevent
disease from spreading.

de

Limited steep hills that are prone
to landslide in jurisdiction.

Sliding of a mass of soil, detritus,
or rock on or from a steep slope.

Structural damage or collapse ¢
buildings.

Risk to life, medical surge.

1e Temperatures

Entire jurisdiction.

Extreme heat—period of 3
consecutive days which air
temperature reaches 90F or
higher on each day.

Extreme cold— period of 3
consecutive days of minimum
temperatures at or below OF

Overburdened power systems
may experience failures due to
extreme heat.

Shortages of heating fuel in
extreme cold due to high
demand.

Medical surge.

reservoirs, streams, &
wells creating water
emergencies

S
® impacts on agriculture
L
@ impacts on hydrology &
ecology
Overall:

Loss of crops.

Inadequate quantity of drinking
water.

Loss of water for fire protectior

Increased risk of fire.

uake

Entire jurisdiction.

Richter Scale:
@ <3,4 (detected only by
seismometers)
e >8 (total damage,
surface waves seen,
objects thrown in air)