4 Recession Curve Displacement method Consider the baseflow

4. Recession Curve Displacement method Consider the baseflow recession curve portrayed below.Apply the recession curve displacement method to calculate the amount of recharge that happened during the storm event where there is a spike in the river flow rate. 10 10 2 10 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 Time(days)

Solution

Solution:-

t₁=80 days = 6.912 x 10⁶ seconds

t_c= 0.2144x 80 =17.152 days

Q₁ = 710 m³/s (from curve by using t_c)

Q₂ = 1000 m³/s ( from curve by using t_c)

G = 2x (Q₂ - Q₁ ) t₁/(2.3026)

= 2 x (1000- 710) x 6.912 x10⁶/ (2.3026)

(Amount of recharge) G = 1.741 x10⁹ m³ Answer