[DOC] [TLE] Severe Weather 101: Flood Basics [PAR] Floods can happen during heavy rains, when ocean waves come on shore, when 
... flowing creeks and rivers, causing rapid rises of water in a short amount of time
. ... and parking lots increases runoff by reducing the amount of rain absorbed by 
the ground. ... A wall of water 10-15 feet high can scour a canyon suddenly. [DOC] [TLE] WHAT : Heavy Rain and Flash Floods - Passport to Knowledge [PAR] Particularly heavy rains can result in abnormally high water levels; heavy 
snowfall can ... The opposite is true for rocky areas like mountains or canyons 
where there is little to no soil. ... Unlike most river floods, flash floods happen 
suddenly. ... by huge storms dropping a lot of precipitation in a relatively short 
time, like when a... [DOC] [TLE] Streams and Drainage Systems - Tulane University [PAR] Nov 2, 2015 ... Over time, nearby channels merge with smaller tributaries joining a larger trunk 
stream. ... Discharge increases as more water is added through rainfall, tributary 
.... results in valleys and rapid downcutting in stronger rocks results in canyons. ... 
Sudden changes in velocity can result in deposition by streams. [DOC] [TLE] Flash flood - Wikipedia [PAR] A flash flood is a rapid flooding of geomorphic low-lying areas: washes, rivers, 
dry lakes and basins. It may be caused by heavy rain associated with a severe 
thunderstorm, ... Flash flooding can also be caused by extensive rainfall released 
by hurricanes ... What makes flash floods most dangerous is their sudden nature 
and... [DOC] [TLE] Ruptured Dam Gives Insight Into the Formation of the Grand Canyon ... [PAR] Aug 23, 2008 ... A lot of rain, a lot of water, and a gorge transformed in a matter of minutes. What 
can a ruptured earthen dam tell us about the formation of the Grand Canyon ... 
the rain-swollen rivers and sudden flood did not cause any reported damage ... is 
a testament to the amazing power of a lot of water over a little time... [DOC] [TLE] Weather Dangers - Grand Canyon National Park (U.S. National Park ... [PAR] Lightning can strike 10 miles across the canyon, so being below the rim does ... 
Flash floods can occur at any time of the year. ... It does not have to be raining 
where you are to cause a sudden flash flood in ... This is because the arid, 
sparsely vegetated environments found in this area have little capacity to absorb 
rainfall. [DOC] [TLE] Chapter 2 Types of Floods and Floodplains - FEMA [PAR] to flash flooding in cases where intense rainfall results in a rapid surge of ... 
occurred in the Big Thompson Canyon in Colorado in ... Sudden destruction of 
structures and washout of access roads may result in loss of ... little or no time for 
... Flooding due to ice jams (or other ice conditions) can occur at different times 
and in. [DOC] [TLE] Flood and Flash Flood Preparedness - The Disaster Center [PAR] You will not always have a warning that these deadly, sudden floods are coming. 
... from fields or woodlands to roads and parking lots, it loses its ability to absorb 
rainfall. Urbanization increases runoff two to six times over what would occur on 
.... Floods can happen quickly and you may need to leave with little or no notice. [DOC] [TLE] Unit 3: Streams and Mass Wasting - Earth Science Australia [PAR] The average velocity is the time it takes a given particle of water to traverse a ... 
Discharge increases as more water is added through rainfall, tributary .... Sudden 
changes in velocity can result in deposition by streams. ..... Another effect is the 
way a grass covered slope seems to ooze downhill forming little bulges in the soil
. [DOC] [TLE] Rain & Floods - Weather Wiz Kids weather information for kids [PAR] A flood results from days of heavy rain and/or melting snows, when rivers rise ... A 
flash flood is sudden flooding that occurs when floodwaters rise rapidly ... In 
narrow canyons and valleys, floodwaters flow faster than on flatter ground and 
can... [DOC] [TLE] Introduction to Flash Flood Waves - Storm Highway [PAR] These waves can arrive suddenly and without warning

Question: In a canyon, it can be the sudden result of a lot of rain in a little time
Answer: flash flood