Plant Hydraulics - Public Water Systems - page 896

TABLE 26-2. ( Continued )

Range
Best

Use in Design
From Kind of Conduit Worst To

Semicircular metal flumes, corrugated 0.0225 0.030

Canals and ditches:
Earth, straight and uniform 0.017 0.025 0.0225

Rock cuts, smooth and uniform 0.025 0.035 0.033

Rock cuts, jagged and irregular 0.035

Winding sluggish canals 0.0225 0.030 0.0275

Dredged earth channels 0.025 0.033

Canals with rough stony beds, weeds on earth banks 0.025 0.040 0.035

Earth bottom, rubble sides 0.028 0.035 0.030 0.033

Natural stream channels:
(1) Clean, straight bank, full stage, no rifts or deep
pools 0.025 0.033

(2) Same as (1), but some weeds and stones 0.030 0.040

(3) Winding, some pools and shoals, clean 0.033 0.045

(4) Same as (3), lower stages, more ineffective
slope and sections 0.040 0.055

(5) Same as (3), some weeds and stones 0.035 0.050

(6) Same as (4), stony sections 0.045 0.060

(7) Sluggish river reaches, rather weedy or with
very deep pools 0.050 0.080

(8) Very weedy reaches 0.075 0.150

Source: Adapted from reference 5.

Hydraulic
Grade Line

H L

Vel=V

Hydraulic Component

Fig. 26-3. Headloss in a pressure pipe system