# Chapter 8 : Storage and Runoff Control¶

## Example 8.2 Page No : 8-7¶

In :

#initialisation of variables
a = 0.75	#ft
p = 123	#mg
v = 100	#ft
s = 33	#mg
s1 = 67	#mg
d = 26.6	#mgd
d1 = 0.0477	#mgd
q = 0.750	#gpd/sq mile
d2 = 365	#days

#CALCULATIONS
S = p/a	#mg per sq mile
Cv = v*s/s1	#percent
M = d*d1	#mgd per sq mile
D = v*q/M	#MAF
D1 = (v*p)/(M*d2)	#MAF
R = p/q	#days

#RESULTS
print 'the use monthly averages rather then daily stream flow = %.0f days'%(R)

the use monthly averages rather then daily stream flow = 164 days


## Example 8.3 Page No : 8-9¶

In :

#initialisation of variables
d = 750000	#gpd per sq mile
v = 0.22	#ft
a = 1.27	#ft
q = 0.30	#ft
d1 = 365	#days
p = 0.25	#ft

#CALCULATIONS
Q = q*a*d1	#mg/sq mile
H = p*a*d1	#mg/sq mile

#RESULTS
print 'the results obtained by normal analytical procedures and by Hazen s = %.0f mg/sq mile'%(H)

the results obtained by normal analytical procedures and by Hazen s = 116 mg/sq mile


## Example 8.4 Page No : 8-10¶

In :

#initialisation of variables
d = 30.0	#mgd
a = 40.0	#sq miles
a1 = 1500	#acres
r1 = 47.0	#in
r2 = 27.0	#in
q = 0.9	#in
k = 640	#in
h = 0.052	#gpd/sq mile

#CALCULATIONS
Q = r2-(r2+a-r1)*q*a1/(k*a)	#in
D = d+a*h	#mgd
A = a-(q*a1/k)*(1-(r1-a)/(r2))	#sq miles
R = r2+a-r1	#in
S = R*q	#in

#RESULTS
print 'the revised mean annual runoff = %.1f in'%(Q)
print 'the equivalent mean draft = %.1f mgd'%(D)
print 'the equivalent land area = %.1f sq miles'%(A)
print 'the adjusted flowline = %.0f in'%(S)

the revised mean annual runoff = 25.9 in
the equivalent mean draft = 32.1 mgd
the equivalent land area = 38.4 sq miles
the adjusted flowline = 18 in


## Example 8.6 Page No : 8-18¶

In :

#initialisation of variables
p = 100.    	#ft
q = 27000.	    #acre-ft
p1 = 10.     	#ft
s = 8250.	#acre-ft

#CALCULATIONS
R = p*s/q	#percent

#RESULTS
print 'the ratio of peak inflow from fuller values = %d percent'%(R)

the ratio of peak inflow from fuller values = 30 percent