Page 200 -

HIGH-RATE GRANULAR MEDIA FILTRATION 8.19

WATER --GULLET
TROUGHS

Los Angeles (CA) Aqueduct Water Filtration Plant (300 mgd)

GULLET
WASH 1
WATER
t
TROUGHS
36'
--FILTER
(TYP OF 8)
J !1
- t
PIPE GALLERY 20'
Hemlock Water Filtration Plant; Rochester, NY (48 mgd}

lY---
WASH
WATER"
TROUGHS
19' " i 23' -- FILTER
(TYP OF 4)
I
18'
PIPE GALLERY
l__
Attleboro (MA) Water Treatment Plant (12 mgd)
FIGURE 8.10 Typical filter configurations. (Courtesy of CDM.)

In larger plants, placing filters in rows on opposite sides of a pipe gallery is common
practice. In smaller plants, a single row of filters results in simpler construction. Typical
filter configurations are shown in Figure 8.10.
Location of the filtered water clearwell under the pipe gallery, and common walls be-
tween filtered and unfiltered water, should be avoided to prevent the possibility that leak-
age through the walls may contaminate filtered water. A false floor should be provided