Water Street Hydrologic and Hydraulic (H&H) Analysis

(Drainage Study)

City of PlattevilleCommon Council

Presented by:Caroline Burger, P.E.

Theran Jacobson, E.I.T.AECOM

Madison, WI

Outline Existing Conditions Fire Station Impacts Alternatives Cost Estimates Conclusions Recommendations

Existing Conditions

Fire Station Location #1 and #2 were modeled separately

Purpose was to determine the individual impact from each

Modeling indicates neither location will “adversely impact” the Water Street Basin

“Adversely impact” means increasing water surface elevations

Fire Station Impacts

Location #1

Location #2

1. Regrade Open Channel

2. Replace Open Channel with Box Culvert

3. Construct Stormwater Pond

4. Combination of 1 - 3

Alternatives

Regrade open channel

Reconstruct junction Results in no adverse

impacts

Location #1

Alternatives - Scenario 1

Replace open channel with box culvert

Reconstruct junction Results in no adverse

impacts

Location #1

Alternatives - Scenario 2

Alternatives – Scenario 3

Location #2

Replace open channel with box culvert

Results in adverse impacts

Alternatives – Scenario 4

Location #1

Location #2

Construct stormwater pond by high school

Results in no adverse impacts

Alternatives – Scenarios 5-7

Location #1

Location #2

Scenario 5: Combination of Open Channel at Location 1 and pond

Scenario 6: Combination of Box Culvert at Location 1 and pond

Scenario 7: Combination of Box Culvert at Location 2 and pond

All result in no adverse impacts

Cost Estimates

Location #1

Location #2

Scenario Capital Cost ($)

1 $174,000

2 $311,000

3 $300,000

4 $203,000

5 $377,000

6 $514,000

7 $503,000

A Fire Station at either location will not adversely impact the basin

Improvements to Location 1 will not adversely impact the basin

Improvements to Location 2 will adversely impact the basin

If Location 2 is chosen, the stormwater pond must also be constructed

The stormwater pond will reduce water surface elevations in the basin

Conclusions

Location #1

Location #2

Proceed with the selection of the Fire Station location

The junction box downstream of location 1 and the sanitary main adjacent to location 1 should be addressed

Conveyance improvements will likely require permitting – meet with WDNR staff early during design

Recommendations

Location #1

Location #2

Questions?