W = QT/60 = 3333.3×20/60 = 1111.1 m3
分为两池，每池净平面面积:
F’= W/(nH1) = 1111.1/(2×2.5) = 222.2 m2
池子宽度B:按沉淀池宽采用16 m 池子长度（隔板间净距之和）:
L’= 222.2/16 = 13.89 m
隔板间距按廊道内流速不同分成6档:
a1=Q/(3600nv1H1)= 3333.3/(3600×2×0.5×2.5)= 0.37m 取a1=0.4 m，则实际流速v1’= 0.463 m/s
a2=Q/(3600nv2H2)= 3333.3/(3600×2×0.4×2.5)= 0.46m 取a2=0.5 m，则实际流速v2’= 0.37 m/s
a3=Q/(3600nv3H3)= 3333.3/(3600×2×0.35×2.5)= 0.53m 取a3=0.6 m，则实际流速v3’= 0.309m/s
a4=Q/(3600nv4H4)= 3333.3/(3600×2×0.3×2.5)= 0.62m 取a4=0.7 m，则实际流速v4’= 0.264 m/s
a5=Q/(3600nv5H5)= 3333.3/(3600×2×0.25×2.5)= 0.741m 取a5=0.8 m，则实际流速v5’= 0.231 m/s
a6=Q/(3600nv6H6)= 3333.3/(3600×2×0.20×2.5)= 0.926m 取a6=1.0 m，则实际流速v6’= 0.185 m/s
每一种间隔采取3条,则廊道总数为18条,水流转弯次数为17次.则池子长度(隔板间净距之和):
L’=3(a1+a2+a3+a4+a5+a6)=3(0.4+0.5+0.6+0.7+0.8+1.0)= 12m