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ENVS week 7

by: Bianca Notetaker

ENVS week 7 ENVS 101 004

Bianca Notetaker
GPA 3.0
The Blue Planet

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About this Document

Covers the hydrologic cycle and floods
The Blue Planet
Class Notes
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This 2 page Class Notes was uploaded by Bianca Notetaker on Wednesday October 7, 2015. The Class Notes belongs to ENVS 101 004 at University of New Mexico taught by Priewisch in Summer 2015. Since its upload, it has received 52 views. For similar materials see The Blue Planet in Environmental Science at University of New Mexico.


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Date Created: 10/07/15
Hydrologic cycle Thursday ctober 1 2 15 215 AM Ground water flow 0 Depends on the porosity and permeability of the rocks and sediment it moves through 0 percentage of total volume of rock that consists of open pore space 0 measure of how easily water can flow through sediment or rock 0 Vertical flow from surface down to water table it flows with gravity flows laterally in the saturated zones ex a layer of rock flows from high to low areas Groundwater recharge and discharge 0 Water moved through the system to areas if discharge at surface springs streams rivers lakes wetlands marshes etc 0 a flow of groundwater that emerges naturally at the surface 0 deep groundwater shallow igneous intrusions Water table 0 Separates unsaturated and saturated zone 0 Represents the joker limit of useable groundwater O Follows the shape of the ground surface higher under hills and lower under valleys Aquifers O A body of rocksediment hat sufficiently stores and conducts significant quantities of groundwater has a water table underground water is in contact with atmosphere is bonded above and below by an impermeable rock layer Groundwater withdrawal 0 water is injected back into the aquifer it39s bad if an aquifer becomes dry because the sediment compresses and will never be able to hold water again 0 Subsidence caused by groundwater withdrawal 0 Compaction of pore space translated to surface elevation decrease and open fissure formation 0 Extensive and uneven permanent compaction of sediments 0 Formation of large fissures Groundwater pumping Water is pumped from an aquifer feaster than water can flow towards well to replace it Size depends on water withdrawn Water flowing towards the well withdrawal cone stabilizes O 0 Chapter 8 Page 1 Hoods T Ll Floods 0 Hours or minutes is considered a flash flood o due to long and unusual precipitation patters I Water levels rise gradually over weeksdays I Larger and larger areas of the floodplain become submerged in water 0 Flood prediction I Because floods can be so dangerous prediction is essential I Frequency of past floods can be plotted calculating the average time interval between two floods if equal magnitude 0 100year flood O Recurrence interval 0 There is a 1 in 100 chance in a given year for a flood this size 0 It is possible that a 100yearflood could happen two or three years in a row 0 It is also possible that it might not occur for more than 100 years 0 Flood control 0 Different strategies Different Pros Cons strategies Artificial levee allows you to walk over the body of water Channelization 0 widens the stream and 0 increases erosion deepens it to make it flow 0 predictions become difficult more efficiently because the channel is modified 0 water flows faster Floodcontrol 0 built to store flood water and 0 the reservoir may cover farm dams release it slowly lands and you may need to 0 you get water for irrigation relocate 0 Leads to separation of soil and rocks this means creation of landslides Nonstructural 0 Best approach is to limit approach development of flood plains Chapter 8 Page 1


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