Date ePortage7B 7 Beginning about I mile downstream from Rainbow Dam, a series o

Question

Date ePortage7B 7 Beginning about I mile downstream from Rainbow Dam, a series of contour lines cross the Missouri River. In a distance of 1.7 river miles, the river drops 60 feet. On the basis of this information. w is the gradient of the river along this stretch? State ri River? hat he e instal- dix B), your answer in feet per mile. Pucpe8.The Missouri River flows a total distance of 2,500 miles from its headwaters at 14,000 feet above sea level to its confluence with the Mississippi River at 410 feet above sea level. (a) What is the average gradient of the Missouri l b he r depth m? River from source to mouth? State your answer in feet per mile. ie (b) What is the average gradient of the Missouri River from source to mouth? State your anwer in meters per kilometer e, (c) Why does the average gradient differ from the an gradient determined in question 7?

Explanation / Answer

(7)WITHIN 1.7 RIVER MILES RIVER DROPS 60 FEET SO

WE ARE GIVEN THE HYPERTONUES OF THE TRIANGLE(H)=1.7 AND THE HEIGHT DROP (D)SO THE GRADIENT OF THE RIVER WILL BE TAN(THETA)=60/1.7=35.29 FEET/MILES

(8) AVERAGE GRADIENT = (14000-410)/2500= 5.43

(B) 1.028

(C) BECAUSE IN QUESTION 7 WE HAVE USED RIVER DISTANCE NOT ACTUAL HORIZONTAL DISTANCE TO DETERMINE THE GRADIENT

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