BOARD02052

• Board Meeting Date: 8/15/1995
• Description: Notice of Board Meeting
• Board Meetings - Doc Type: Meeting

Water Supply and Storage Company
Page 2

OUTLET WORKS COl\.1PONENTS

Long Draw Dam and its outlet works are shown on the attached photocopies of construction
drawings (Figures 1-8) so that the reader can better visualize the configuration of the dam
and outlet works and its mode of intended operations. The outlet works consists of the
following components:

1. Trash rack with steel grating with approximately 300 square feet of opening
(Figure 5).

2. Stop log slot at conduit entrance (not shown).

3. 149.5 linear feet of 54-inch cast-in-place reinforced concrete-encased steel-
lined pipe at 0.40% (Figure 5).

4. Control structure from top of dam to conduit invert (11.5 linear feet along
flow line) including:
· Dividing wall in center of control structure with 54-inch
. by 54-inch sluice gate (Figures 6 and 7),
· 60-inch by 60-inch slide gate at top of dividing waIl (not
shown),
· 54-inch by 54-inch sluice gate at entrance to downstream
outlet box (Figures 6 and 7),
· 6-inch pipe air vent in roof on gate house (not shown).

S. 9 linear feet of 5.25-foot by 6-foot to 6-foot by 6-foot transition box culvert
with 8-inch pipe air vent to crest of dam (Figure 5).

6. 128.5linear feet of 6-foot x 6-foot box outlet conduit at 2.00% (Figure 5).

7. 80 linear feet (horizontal distance) of open channel chute with flip bucket
(Figure 5). .

8. 18,000 square-foot plunge pool with 4-foot thick riprap and 2: I side slopes
(Figure 4).

9. 35 linear-foot Parshall flume with a 12-foot wide section for measuring flows
in Long Draw Creek (Figure 8).

Each of the above components was selected for reliability under a variety of circumstances,
including no inspections or operation and maintenance for as long as a six-month absence
from the sIte. The .closing down" of Long Draw Dam for the winter was an important