Helpppp: How do the gradient and discharge change between a streams headwaters and mouth?

My textbook is not helping much right now...... Helpppp: How do the gradient and discharge change between a streams headwaters and mouth?
The discharge for a single stream should not change much from the headwater to the mouth. The exceptions to the ule would be if another stream joined the main stream, which would increase the discharge or if you loose a significant amount of water to infilitration, which would decrease the discharge. The gradient should be high at the headwaters and gradually decrease downstream where it should be low at the mouth. Of course differences in lithologies or sedcondary streams can change the gradient for a short distance, thought the overall profile should fit the expected model.

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