A flocculator tank has a volume of 2800 m3. The temperature of water in the tank is 15°C, and the average velocity gradient maintained in the tank is 100/s. The temperature of water is reduced to 5°C, but all other operating conditions including the power input are maintained as the same. The decrease in the average velocity gradient (in %) due to the reduction in water temperature is ________ (round off to nearest integer).

[Consider dynamic viscosity of water at 15°C and 5°C as 1.139 × 10-3 N - s/m2 and 1.518 × 10-3 N - s/m2 , respectively] 

When a supercritical stream enters a mild-sloped (M) channel section, the type of flow profile would become _________.

G₁ and G₂ are the slopes of the approach and departure grades of a vertical curve, respectively.

Given |G₁| < |G₂| and |G₁| ≠ |G₂| ≠ 0

Statement 1 : +G₁ followed by +G₂ results in a sag vertical curve.

Statement 2 : −G₁ followed by −G₂ results in a sag vertical curve.

Statement 3 : +G₁ followed by −G₂ results in a crest vertical curve.

Which option amongst the following is true?