River Regs

Question 1

Purpose of Old Hickory Dam instructions for reservoir regulations

Answer 1

1 - provide instructions to the operators and disseminating pertinent hydrometerorlogical info
2 - presents the water control plan for normal and emergency regulations
3 - provides standing operating procedures which are in effect when there is a loss of communication with district office

Question 2

Responsible agencies

Answer 2

project owner - USACE
operating agency - USACE
regulating agency - USACE
hydropower marketing agency - SEPA
hydropower scheduling - TVA

Question 3

Water control plan 3 primary objectives

Answer 3

provide 9’ slackwater pool for nav from OLD to COR
hydropower
provide a small amount of surcharge storage to mitigate the effects of the reservoir by replacing natural valley storage lost due to the impoundment

Question 4

primary water management functions of operators

Answer 4

insure headwater and tailwater levels are above minimum allowable
see that changes in generation do not exceed 1 unit/hr
that machinery is operated within allowable limits

Question 5

what are the 3 zones of the pool

Answer 5

inactive pool - bottom of lake to 442
power pool - 442-445
surcharge pool - 445-450

Question 6

hydropower generation increase/decrease is limited to

Answer 6

one unit per hour

Question 7

what is the elevation and cfs with one unit running

Answer 7

385 6000CFS

Question 8

Why do we need to maintain 1000CFS

Answer 8

waste water assimilation in the nashville area

Question 9

periods of zero release are restricted to what

Answer 9

no more than 6 consecutive hours

Question 10

if the rise is expected to be short term, what can you allow the headwater elevation to rise to

Answer 10

445.15

Question 11

what is freeboard

Answer 11

distance from the top of the water level to the top of the spillway gate

Question 12

Flow rates for Crop/Flood

Answer 12

Crop - 54,000 CFS

Flood - 90,000 CFS

Question 13

Rate of release change limits

Answer 13

Increase - 5000CFS

Decrease - 10,000CFS - try to limit to 5000CFS

Question 14

What happens when headwater gets to 450’

Answer 14

the 5000CFS limit no longer applies and releases my be increased as needed to prevent any further rise

Question 15

Priorities for drought regulations

Answer 15

water supply
water quality
navigation
hydropower
recreation

Question 16

river flow times

Answer 16

DAL - 11 -
WOL - 20 - COR - 16 -
CEN - 20 - OLD - 5 -
JPP - 5 - CHE - 9 - BAR

Question 17

What happens when tailwater rises to 402

Answer 17

check sump pump and unwater pump discharge check valves closed

Question 18

what happens when tailwater rises to 410

Answer 18

remove taildeck gratings and wedge draft tube gates

Question 19

what happens when tailwater is apparent to reach 418

Answer 19

all signs and buoys should be removed
all water tight covers placed
power turned off to tail deck circuits
move crane to land side & kill power
remove warning horn system and place water tight covers
draft tube and scroll case access doors bolted closed - units will automatically fill if not closed

Question 20

prior to headwater elevation 450

Answer 20

close water tight doors between spillway and draft tube access galleries and valve U2

Question 21

minimum net head

Answer 21

18’

Question 22

What does the spillway gate sign read and when

Answer 22

Danger Dam - spillway gates closed

Danger Dam Open - spillway gates open

Question 23

what form do the operators use to record daily CFS

Answer 23

ORN form 84A

Question 24

where is the rain gauge and temp recorder, what times are they read

Answer 24

switchyard
6AM
6PM

Question 25

What are the combined flows

Answer 25

OLD - turbine and spillway discharge

Nashville - OLD and JPP discharge

Question 26

After the combined flow reaches 90,000 CFS, gate operation shall be based on rising headwater level at a rate between what

Answer 26

.1 to .2 ft/hr