My question is Where did 2008 come from under step 3 Problem

My question is: Where did \"2.008\" come from? under step 3

Problem Consider a concrete (n = 0.013) wide rectangular channel (R : y) that discharges 2.0 m3/sec per unit width of flow. The slope of the channel is 0.0001. A low dam causes a backwater depth of 20 m immediately behind (upstream of) the dam. Compute the distance upstream of the dam to where the normal depth occurs. Step-by-step solution Step 1 of 6 Find the velocity using the formula v= Denote velocity as V 0 0 Substitute 2 m3\'s per m width of flow for g, and 2 m for y 2 2 =1m /s Comment

Solution

2.008 is the specific energy which is represented as head at section 2 as shown above.