Fighting floods in Colorado require more drainage works.

Juan G. R. Fighting floods in Colorado require more drainage works.
Water and Irrigation, Vol 4, No. 1 : 23-24 , September, 2013 , Spain.

Heavy rains from September 9 in the State of Colorado as a consequence of the combined action of various meteorological factors within and outside the territory of the United States of America have caused widespread flooding , the loss of 8 lives and extensive damage economic estimated at one billion dollars , so it is necessary to further evaluate the effects of rainfall which caused the flow of internal waters and the effects of the rains that were for external water in the affected areas . Should be improved from the new record rainfall, the calculation of internal drainage in cities as well as clean and give more section to the channels used to drain excess water .

The floods in the state of Colorado in the United States began September 9, 2013 with heavy rains and severe flooding that affected the counties Front Range , Colorado Springs and Fort Collins , the bad weather intensified greatly damaged the county Boulder where the September 12 saw a record rainfall of 231 mm . The floods affected 17 counties in the State of Colorado and several counties in the states of Kansas and Wyoming.

According to the  Climate  Center  , the rain that fell from 9 September to 15 September in Boulder County , Colorado , happened to have one of its driest years its more humid with an annual accumulated precipitation of 766 mm , of  whose 231 mm corresponds to the day September 12 which was a record for a single day, almost double the previous record of 122 mm set on July 31, 1919 . The main street in Boulder , Baseline was a torrential river and Boulder Canyon , the Grand Canyon that goes in and out of the city had increased greatly the water level. The record is especially noteworthy because since before September 9 in Boulder , along with much part of eastern Colorado , still lived in drought conditions in the long term with a cumulative rainfall of 305 mm . The average annual rainfall Boulder County is 524 mm.

Boulder County rainfall, Colorado.

Meteorological factors before the flood that significantly influenced on the weather , were a strong area of ​​high pressure over southwestern Canada and another low pressure area over northwest upper level of the Rockies. The air flow around the two weather systems got an extraordinary wet food Pacific air and of the Gulf of Mexico and northward transport in Colorado. Once that the warm and moist air hit Colorado, he met a stalled frontal boundary and the Rocky Mountains, which caused cold air to rise and condense into clouds that produce heavy rains, the combined action of Manuel tropical storm in Pacific and Ingrid storm in the Gulf of Mexico created favorable conditions for the increase of cloudiness and precipitation .

Floods are the largest that have occurred in the area in decades , with an estimated of 19  thousand homes damaged and around 1,500 have been destroyed , at least 30 road bridges have been destroyed and around 20 have been severely damaged , thousands hectares of crops have been flooded. They were also affected hundreds of infrastructure, road and rail communications have damaged thousands of miles . Big Thompson River in North Fork exceeded more than 12 inches water levels compared to 1976. There are 8 people dead and hundreds missing, the economic losses are estimated at one billion dollars.

President Barack Obama first declared a state of emergency for Boulder , El Paso and Larimer counties , with a further addition of 12 counties on Sept. 16 : Adams , Arapahoe, Broomfield , Clear Creek , Denver , Fremont , Jefferson , Morgan , Logan , Pueblo , Washington and Weld counties . This authorized federal search and rescue teams, as well as supplies such as food, water, cots, generators, and emergency flood control measures.

Heavy rains in the State of Colorado as a consequence of the combined action of various meteorological factors within and outside the territory of the United States of America has caused widespread flooding , loss of life and economic damage , so it is necessary further evaluate the effects of rainfall which caused the flow of internal waters and the effects of rainfall corresponding to the external water in the affected areas in order to build where required belt channels that reduce runoff from external water and allow to evacuate internal water with less time , reducing flood damage . Should be improved from the new record rainfall the calculating of the internal drainage in cities as well as clean and give more section to the channels used to drain excess water .

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