answersLogoWhite

0

Old canals such as those in Peru or Iraq were dug by hand with simple tools. They are narrow compared to modern canals and are not lined with waterproof material like concrete. Their main purpose was to irrigate fields for crops in marginal climate areas .Modern canals often bring in domestic and industrial water from hundreds of Km away ,whereas old canals were often short-2-20km.Modern canals in nations like New Zealand are mainly to redirect natural water courses to use the flow of water for HEP rather than for irrigation eg 80% of the natural water from the Wanganui River which exits to the SW was redirected northwards ,via drop shafts, canals, lakes and tunnels to Lake Taupo. The east and west diversion schemes from both watersheds of the central plateau of the North Island, increased the volume of water into L Taupo by 20%.The samewater runs through 10 HEP stations on its way north to the Tasman sea.

Los Angeles ,a city of 7milion people, is in an area with only 250mm of rainfall annually.Large canals bring in water from snow melt from a branch of the Rocky Mountains far to the North east.

User Avatar

Wiki User

15y ago

What else can I help you with?

Continue Learning about Natural Sciences

What is the difference between new and old DNA strands?

old is broken but new is not


What is the difference between a old and new cell?

The primary difference between old and new cells lies in their age and functionality. New cells are typically more efficient in performing their biological roles, have better regenerative capabilities, and are often more resilient to stress. In contrast, old cells may exhibit signs of aging, such as reduced metabolic activity, slower repair processes, and increased susceptibility to damage. Additionally, old cells may accumulate more waste products and exhibit changes in gene expression.


Why is there a difference between the amount of energy used by a 18 year old male and an 18 year old female?

The difference in energy usage between an 18-year-old male and female is primarily due to variations in body composition, metabolism, and hormonal factors. Males typically have a higher muscle mass, which requires more energy to maintain, leading to a higher basal metabolic rate (BMR). Additionally, hormonal differences, such as higher testosterone levels in males, contribute to increased energy expenditure. These factors result in males generally needing more calories than females of the same age.


What is the difference between new food pyramid and old food pyramid?

The old food pyramid depicted food groups and recommended servings. The new food pyramid emphasizes variety, moderation, and making healthier food choices. It also includes physical activity as an essential component of a healthy lifestyle.


What is the difference between young stars old stars and dead stars?

Young stars are newly formed stars, often bright and hot, that are still in the early stages of their life cycle. Old stars are stars that have aged and passed the main sequence phase, becoming cooler and larger. Dead stars refer to objects that were once stars but have reached the end of their life cycle, such as white dwarfs, neutron stars, or black holes.

Related Questions

What Difference between the old and the modern English?

what differnce between the old and the modern english


What is the difference between traditional banking and modern banking?

difference between modern and traditional banking is


What is the difference between the old market and the modern market?

old markets not well roofed but modern market are air conditioned


What is the difference between the old market and modern market?

old markets not well roofed but modern market are air conditioned


What is the difference between old market and modern market?

old markets not well roofed but modern market are air conditioned


Describe the difference between old house and modern house?

ones old and ones new


What is the difference between old radio shows and modern T.V?

no one cares


What is the difference between modern day and old day sewing machines?

The difference between a modern day sewing machine and an olden day sewing machine is the modern day sewing machines are powered by electric and not done by hand.


What is the difference between modern and old mircroscopes?

there is a wide variety of change as the technology keeps on changing .


What is the difference between old and modern means of transportation?

airplanebuscarcanoedonkeyexpresswayferryfreewaygliderhot air balloonhorseinflatable raftjetpackkayaklorrymotorcyclenaval fleetoxenpalanquinrocketsubwaytaxiunicyclevanwaterwayyachtzeppelinZipline


Difference between old and modern means of communication?

Modern communication is online communication ? A film about today internet millionaires and entrepreneurs.


What is the difference between old and new modern system technology in radio communication and safety?

THATS SIMPLE OLD WERE not so good to commmunecate as new modern things are better