Finding Volume

[Shafiullah]

dear sir,

I have to construct a 1km long water dame. Lengh is = 1000 Meters. Width at the botton is = 60 meters. Width at the top is = 10 meters while the height is 7 meters. Now I request you to tell me a formula to find how many cubic meter is it in total.

 

[Marbles]

(25*1000*7)+(10*1000*7)

I think that's the way.

 

[AhoyNC]

Marbles gave the correct answer.
Here is a link to the formula.
Math Forum - Ask Dr. Math

And here is a link to an on line calculator for a trapezoid.
Online Conversion - Volume of a Trapezoid tank