Da sunan Kogi An san shi da hanyoyin ruwa na ci gaba da ruwa wanda ke kwarara zuwa cikin wasu makamantan su, waɗanda ake kira tekuna: koguna kogin ruwa ne na teku, wanda kuma shine ya mamaye shigar tekuna, saman ruwa wanda ya ƙunshi kashi 71% na saman ƙasa.
Duniya cike take da koguna kuma yawancin ƙasashe suna da dama daga cikinsu, gami da waɗancan ƙasashe waɗanda ba su da hanyar shiga cikin teku, waɗanda ake kira jihohin da ba su da ruwa.
Duk koguna suna da tsarin sifa wanda nasu ne. Asalin kogin yana cikin ɓangaren da ake kira mahaifi, wanda aka ci gaba da hanya, tazara tsakanin tushe da baki.
A cikin babban hanya za ku iya ganin gangara mafi tsayi da saurin motsi na ruwa, tare da ɓarna a cikin madaidaiciyar hanya. Manyan darussan sune, a yanayin bushewa, kwaruruka. A tsakiya da ƙasa ya kai gangaren yana da kyau, ana ci gaba da safarar kuma zaizayar ta zama a kwance, tana faɗaɗa Kwari. The tashar shi ne ramin da ruwa ke gudana ta cikinsa, kuma baki shi ne sararin da kogin ke zuba ruwansa.
Tsarin ruwa na koguna ya sa ya zama dole a kafa yarjejeniya don tantance wanene kogin kuma wanene magudanan ruwa da abubuwan maye, magudanar ruwa da ke samar da kwarara zuwa kogin ba tare da ya zama babba ba. Yawancin lokaci ana bayyana shi ta babban kogi a matsayin mafi yawan kwararar ruwa, ko tare da mafi girman tsayinsa ko yankin magudanar ruwa. Wani lokaci girma da kwararowar koguna suna kama da na masu korar ruwa, ko kuma yanayin yanayin kwararar ruwa ya canza gwargwadon lokacin shekara. Wannan shine dalilin da ya sa aka saba ganin kogunan guda ɗaya ana ba su suna ta hanyoyi da yawa, ko kuma mafi mahimmancin raƙuman ruwa da za a sanya wa suna ta hanyoyi daban -daban.
Geography na Amirka ta Arewa gida ne ga ɗimbin koguna, yawancinsu suna da alaƙa da babban tafkin Mississippi-Missouri-Ohio, wanda ke mamaye kusan kilomita 6000. Yanki ne mai wadata cikin tafkuna, musamman asalin asalin dusar ƙanƙara, wanda ya mamaye yawancin Kanada. Jerin mai zuwa zai nuna wasu misalai na koguna a Arewacin Amurka, tare da taƙaitaccen bayanin mafi mahimmancin su:
- Kogin Mississippi: Yana ratsa tsakiyar yankin Amurka. Tana tafiya tsakanin arewacin Minnesota da Tekun Mexico, tare da tsawon kusan murabba'in murabba'in 4,000.
- Kogin Mackenzie: Dogon kogin Kanada, ya samo asali ne daga Babban Bakin Bawa, a Yankunan Arewa maso Yamma. Yana shiga cikin Tekun Beaufort, a yankin Kanada.
- Kogin St. Lawrence: An haife shi a Ontario, Kanada, kuma yana kwarara kai tsaye zuwa cikin Tekun Atlantika, bayan ƙetare abin da ake kira San Lorenzo estuary, mafi girma a duniya.
- Kogin Colorado: Kimanin tsawon kilomita 2,500. Lokacin da ta ratsa Jihar Arizona, tana haifar da ɗayan manyan abubuwan al'ajabi na yanayi, abin da ake kira 'Grand Canyon na Colorado'.
- Kogin Missouri: Kogin da ya ƙetare Babban Filin Amurka. An samar da kwarinsa don ban ruwa, sarrafa ambaliyar ruwa, da samar da wutar lantarki.
- Ruwa Grande
- Kogin Yucón
- Kogin Churchill
- Kogin St. Clair
- Kogin Motagua
- Kogin Grijalva
- Kogin San Pedro
- Kogin Nelson
- Kogin Hudson
- Kogin Potomac
- Kogin Columbia
- Kogin Balsas
- Kogin Detroit
- Kogin Yaqui
- Kogin Arkansas
Yana iya ba ku:
- Kogin Kudancin Amurka
- Kogin Kudancin Amurka
