WSP07461

• File Number: 8143.600.30
• Description: John Martin Reservoir - Other Studies
• State: CO
• Basin: Arkansas
• Water Division: 2
• Date: 9/1/1982
• Author: Dept of Army
• Title: John Martin Dam and Reservoir - Small Hydropower Addition Reconnaissance Report
• Water Supply Pro - Doc Type: Report/Study

"

. .

. PRELIMINARY.
SUBJECT TO RE.VI'!InON
EA = QA HA EA T/ll.8

o
" .~l

~
Ul
-";1

where.

EA = Average monthly energy (Kilowatt-hours)
HA = Average net operating head (feet)
QA = Average flow rate (cis)
EA = Average plant operating efficiency (0.85)
T = Time (hours/month)

2. The average monthly energy generation determined for the

alternative plans with the above equation are shown in Table 3.

VI. Impacts of Project Operation.

A. Effects on Normal Project Releases.

/

1. A basic premise of this study is that the development of a small

hydropower addition at John Martin Dam would have no effect on the existing

reservoir regulation procedures. This constraint also does not limit the

hydroelectric generation potential because the existing outlet works have

excess capacity to meet downstream release requirements. The outlet works

consist of four six-feet by seven-and-a-half-feet rectangular sluicing

conduits and two iour-feet by four-fe~t regulatini conduits. The discharge

rating curves for these conduits are shown on Plate 2.

2. Assuming that the reservoir elevation is at elevation 3790

(approximately the median pool elevation), then one sluicing conduit would

have the capacity to discharge about 1700 cfs with the gate fully open. At

the same time elevation, one regulating conduit could release at the rate of

550 cfs. Therefore, assuming both regulating conduits operating and three of

the four sluicing conduits open, the dam could release about 6200 cfs. At the

spillway crest elevation of 3840, these five conduits could release about

10,800 cfs. At the top of conservation pool. elevation 3851. the conduits

could release about 11.600 c.f.s.

10