FLOOD00281

• County: Larimer
• Community: Greeley
• Title: Design Criteria and Construction Specifications volume 2 of 5 Storm Drainage Criteria
• Date: 10/1/1997
• Prepared For: Greeley
• Prepared By: Department of Public Works
• Floodplain - Doc Type: Educational/Technical/Reference Information

STEP 7:

STEP 8:

STEP 9:

Friction loss Hf (Column 15):

Hf =
HE =
Hf =

(Avq S,) (L)
(. 0:n9) (110)
0.21

Calculati;! the form losses for bends, junction,
manholes, and transition losses (expansion or
contraction) using the appropriate equations. The
calculation of these losses is presented below for
the various sewer segments since all the losses do
not occur for one sewer segment.

(a) stat:ion 1 + 10 to 1 + 52.4 (bend)

He = KbH" where the degree of bend is 60 degrees
Ke = 0.20 (Table 6-3, Case I)
Hb = (0.20) (0.58) = 0.12 (Enter in Column 16)

(b) stat:ion 2 + 48 to 2 + 55.5 (transition,
expansion)

HL = K" Hv, [I-AdA,]
Ke =1. 06 (Table 6-2) for D,.jD, ,= 1. 5, and <p = 45

HL =(1.06) 1.29 [1 - 15.9/23.76]' = 0.15 (Enter
in Column 19)
(cl station 3 + 55.5 (manhole, straight through)

Hm = KmHv
Krn = (0.05) (Table 6-5, Case I)
Hm = (0.0'5) (1.29) = 0.06 (Enter in Column 18)

(d) station 4 + 55.5 to 4 + 65.5 (junction)

H) = HY2 - KjHYl
KJ = 0.62 (Table 6-5, Case III) <p = 30 degrees
HJ = 1.29 - (.66) (0.99) = 0.64 (Enter in Column 17)

(e)

Station 5 +
since there
estimated as

65.5 to 5 + 75.5
are two latE!rals,
twice the loss for

( junction)
the loss is
one lateral

Kj = 0.33 (Table 6-5, Case III) ~ = 70 degrees
Hj = 0.99 - (0.33) (0.64) = 0.78 for one lateral

Sum all the form losses from Columns 15 through 19
and enter in Column 20. For the reach between
station 0+00 and 1+10, the total loss is 0.21

6 - 10

I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I