Reservoir Consultant's Report
Options Summary
The options from the February 2000 report (section 5.5) are extracted and summarized below.
The most recent recommendations (September 2000) are to both keep the
Reservoir at its lowest level and also to remove trees from along the dam - an
Option 3½. Discussions are still ongoing about the specifics of such a
plan (10/26/00).
|
Reservoir Dam Options from the Consultant's Report |
| |
Option 1 |
Option 2 |
Option 3 |
Option 3 ½ |
Option 4 |
|
Description |
Do nothing. |
Comply with MADEM. |
Limited Repairs with O&M Plan |
Limited Repairs with O&M Plan Isolate Swim Area |
Minimal Repairs Isolate Swim Area |
|
Design Flood |
none |
1/2 PMF |
500 Yr. |
500 Yr. |
500 Yr. |
|
Reservoir Height Above mean sea
level
|
159' / 153' (lower pre-storm) |
159' / 153' (lower pre-storm) |
159' / 153' (lower pre-storm)
|
153' only |
153' only |
|
Trees (on dam top) |
Nothing |
Remove |
Remove |
Remove |
Keep |
|
Dam Top |
Nothing |
Raise several feet. |
Repair |
Repair |
Nothing |
|
Upstream Slope |
Stabilize |
Stabilize |
Stabilize |
Stabilize |
Repair |
|
Downstream Slope |
Nothing |
Stabilize |
Stabilize |
Stabilize |
Repair |
|
Spillway |
Nothing |
Expand to 180' |
Repair |
Repair |
Repair |
|
Downstream Channel |
Nothing |
Clean |
Clean |
Clean |
Clean |
|
Swimming Area |
Unchanged |
Unchanged |
Unchanged |
Isolated & Sealed |
Isolated & Sealed |
|
Monitoring Program |
Yes |
Yes |
Yes |
Yes |
Yes |
|
Emergency Plan |
Yes |
Yes |
Yes |
Yes |
Yes |
|
O&M Plan |
Yes |
Yes |
Yes |
Yes |
Yes |
|
Monitor & Control Seepage |
Yes |
Yes |
Yes |
Yes |
Yes |
|
Estimated Cost - Dam Only *
|
$150,000 * |
$586,000 * |
$328,000 * |
$328,000 *
|
$160,000 *
|
| * Does
not include permit or design costs, or restorative landscaping, or beach
isolation. |
|
Liability |
High |
Lowest |
Mid |
Low |
Mid |
|