Flood report

The rule

Code computed the rating from the assessor's inputs:

extent=core, avoidable=partly -> 3

Set by the rule

Decision

Released with flags

The engine's reasons

• Independent assessments split on the category (5 samples: {'3': 3, '2': 2})

Evidence state

VERIFIED · field study or agency determination

The assessor's comments

FEMA Zone AE with regulatory floodway follows Sallow Creek through the middle of the site; about 62 acres of examined parcels are in Zone AE, including about 21 acres of floodway. About 14 acres of array rows sit in the flood fringe. No equipment is in the floodway. County rules exempt OPSB-permitted facilities, but OPSB expects compliance.

Worst case

The same rule on the worst case gives no rating above the point.

• Present: yes

  FEMA flood hazard determination maps Zone AE with regulatory floodway along Sallow Creek on Parcels 9 and 10 (C-0c116fdc65, C-d0039fd7b9, C-81e2af2ba0). The ODNR review refers to a mapped floodplain of Sallow Creek (C-21574b55b6). No LOMA/LOMR is on file (C-beb33132a9), so nothing removes the mapping.

  Cites C-0c116fdc65, C-d0039fd7b9, C-81e2af2ba0, C-21574b55b6, C-beb33132a9

• Extent: core

  The SFHA follows Sallow Creek through the middle of the site (C-3181379aaa, C-29b335e462). About 62 acres of the examined parcels are in Zone AE, including about 21 acres of floodway (C-0c116fdc65). Parcel 5 is mostly Zone X, with Zone AE on its southern line only, outside the substation and BESS yard (C-417a553cb9).

  Cites C-3181379aaa, C-29b335e462, C-0c116fdc65, C-417a553cb9

• Avoidable: partly

  No arrays, inverters, substation, BESS yard or fill are in the floodway (C-93c27ec8ff), but about 14 acres of array rows sit in the flood fringe on Parcels 9 and 10 (C-546dd83365). Those acres may need to be dropped if flood levels prove higher than mapped (C-75d2a2cad3). Some equipment therefore currently sits in the floodplain.

  Cites C-93c27ec8ff, C-546dd83365, C-75d2a2cad3

• Pathway: standard

  Equipment in Zone AE is subject to county floodplain regulations unless exempt (C-5edaac1379). County regulations exempt OPSB-permitted major utility facilities (C-2227c77011), but OPSB staff expect the application to show compliance (C-846dff3266). The exemption rests on ORC 4906.13(B) as described in CCO-FLOOD. No floodway equipment is proposed (C-93c27ec8ff), so no no-rise analysis or map revision is indicated. This is a standard permit or compliance showing (CCO-FLOOD, F-NFIP).

  Cites C-5edaac1379, C-2227c77011, C-846dff3266, C-93c27ec8ff

• Impact likely: yes

  About 14 acres of array rows are in the flood fringe (C-546dd83365). Landowners report the floodplain fields flood for a day or two most springs and that Sallow Creek overtopped Linnet Road at the county bridge (C-9f6b8123d8, C-db721b9fe7). A typical build would place equipment in the floodplain without siting changes.

  Cites C-546dd83365, C-9f6b8123d8, C-db721b9fe7

Supporting statements (16)

Each claim the row cites: the statement in the assessor's words, then the quote the engine found on the page.

1. C-0c116fdc65

   Approximately 62 acres of the examined parcels lie within Zone AE, including about 21 acres of regulatory floodway.

   Approximately 62 acres of the parcels examined lie within Zone AE, including about 21 acres of regulatory floodway.

   Standard Flood Hazard Determination - Tamsin Ridge Parcels 5, 9 and 10 · DR-0009 · Page 1 · 2023-03-15

   Source agency_determination · Claim type extent · Polarity presence · Confidence high · Quote check exact, 100 of 100

   See it on page 1, claim C-0c116fdc65

2. C-21574b55b6

   Carroll County participates in the NFIP; a mapped floodplain of Sallow Creek exists, and the county floodplain administrator should be contacted.

   Contact the county floodplain administrator about development in the mapped floodplain of Sallow Creek.

   ODNR Environmental Review - Tamsin Ridge Solar and Storage Project (ODNR 23-0477) · DR-0011 · Page 1 · 2023-05-02

   Source agency_determination · Claim type presence · Polarity presence · Confidence medium · Quote check exact, 100 of 100

   See it on page 1, claim C-21574b55b6

3. C-2227c77011

   County floodplain regulations exempt major utility facilities permitted by the Power Siting Board.

   They exempt major utility facilities permitted by the Power Siting Board.

   Zoning Verification - Tamsin Ridge Solar and Storage Project · DR-0022 · Page 1 · 2023-02-14

   Source agency_determination · Claim type regulatory · Polarity absence · Confidence medium · Quote check exact, 100 of 100

   See it on page 1, claim C-2227c77011

4. C-29b335e462

   The SFHA follows Sallow Creek through the middle of the property.

   The special flood hazard area (SFHA) follows Sallow Creek through the middle of the property.

   Standard Flood Hazard Determination - Tamsin Ridge Parcels 5, 9 and 10 · DR-0009 · Page 1 · 2023-03-15

   Source agency_determination · Claim type presence · Polarity presence · Confidence medium · Quote check exact, 100 of 100

   Cited by AQ-01 · Filed under AQ-01

   See it on page 1, claim C-29b335e462

5. C-3181379aaa

   FEMA maps Zone AE with a regulatory floodway along Sallow Creek through the middle of the site.

   AE, with a regulatory floodway, along Sallow Creek through the middle of the site.

   Stormwater, Floodplain and Drainage Memo - Tamsin Ridge Solar and Storage Project · DR-0019 · Page 2 · 2023-06-05

   Source map_or_figure · Claim type presence · Polarity presence · Confidence high · Quote check exact, 100 of 100

   See it on page 2, claim C-3181379aaa

6. C-417a553cb9

   Parcel 5 is mostly Zone X, with Zone AE along its southern line only, outside the proposed substation and battery yard.

   Zone X (area of minimal flood hazard); Zone AE along its southern line only, outside the proposed substation and battery yard

   Standard Flood Hazard Determination - Tamsin Ridge Parcels 5, 9 and 10 · DR-0009 · Page 1 · 2023-03-15

   Source agency_determination · Claim type presence · Polarity presence · Confidence high · Quote check exact, 100 of 100

   See it on page 1, claim C-417a553cb9

7. C-546dd83365

   About 14 acres of array rows are in the flood fringe on Parcels 9 and 10.

   About 14 acres of array rows are in the flood fringe (Zone AE outside the floodway) on Parcels 9 and 10,

   Stormwater, Floodplain and Drainage Memo - Tamsin Ridge Solar and Storage Project · DR-0019 · Page 2 · 2023-06-05

   Source consultant_memo · Claim type extent · Polarity presence · Confidence medium · Quote check exact, 100 of 100

   Cited by EG-01 · Filed under AQ-02, EG-01

   See it on page 2, claim C-546dd83365

8. C-5edaac1379

   Buildings or equipment placed in Zone AE would be in the SFHA and subject to county floodplain management regulations, unless exempt.

   Any building or equipment placed in Zone AE would be in the SFHA and subject to the county's floodplain management regulations, unless exempt.

   Standard Flood Hazard Determination - Tamsin Ridge Parcels 5, 9 and 10 · DR-0009 · Page 1 · 2023-03-15

   Source agency_determination · Claim type regulatory · Polarity presence · Confidence high · Quote check exact, 100 of 100

   Filed under AQ-02, PE-01

   See it on page 1, claim C-5edaac1379

9. C-75d2a2cad3

   Flood fringe array rows should be checked against a local hydraulic model; if flood levels are higher than mapped, those 14 acres may need to be dropped.

   if flood levels prove higher than mapped, those 14 acres may need to be dropped.

   Stormwater, Floodplain and Drainage Memo - Tamsin Ridge Solar and Storage Project · DR-0019 · Page 2 · 2023-06-05

   Source consultant_memo · Claim type recommendation · Polarity neutral · Confidence medium · Quote check exact, 100 of 100

   Cited by EN-08 · Filed under AQ-02, EN-08

   See it on page 2, claim C-75d2a2cad3

10. C-81e2af2ba0

    Parcel 10 lies in Zone AE along Sallow Creek; the remainder is Zone X.

    Zone AE along Sallow Creek; remainder Zone X

    Standard Flood Hazard Determination - Tamsin Ridge Parcels 5, 9 and 10 · DR-0009 · Page 1 · 2023-03-15

    Source agency_determination · Claim type presence · Polarity presence · Confidence high · Quote check exact, 100 of 100

    See it on page 1, claim C-81e2af2ba0

11. C-846dff3266

    Carroll County floodplain regulations exempt major utility facilities permitted by OPSB, but OPSB staff expect the application to show compliance.

    Carroll County's floodplain regulations exempt major utility facilities permitted by the OPSB, but OPSB staff expect the application to show compliance with them.

    Stormwater, Floodplain and Drainage Memo - Tamsin Ridge Solar and Storage Project · DR-0019 · Page 2 · 2023-06-05

    Source consultant_memo · Claim type regulatory · Polarity neutral · Confidence medium · Quote check exact, 100 of 100

    Filed under AQ-02, PE-01, PE-02

    See it on page 2, claim C-846dff3266

12. C-93c27ec8ff

    No arrays, inverters, substation, BESS yard or fill are placed in the floodway.

    No arrays, inverters, the substation, the BESS yard or fill are placed in the floodway.

    Stormwater, Floodplain and Drainage Memo - Tamsin Ridge Solar and Storage Project · DR-0019 · Page 2 · 2023-06-05

    Source consultant_memo · Claim type absence · Polarity absence · Confidence high · Quote check exact, 100 of 100

    See it on page 2, claim C-93c27ec8ff

13. C-9f6b8123d8

    Landowners report floodplain fields flood for a day or two most springs.

    the floodplain fields flood for a day or two most springs.

    Stormwater, Floodplain and Drainage Memo - Tamsin Ridge Solar and Storage Project · DR-0019 · Page 2 · 2023-06-05

    Source consultant_memo · Claim type presence · Polarity presence · Confidence medium · Quote check exact, 100 of 100

    Cited by EN-08 · Filed under AQ-02, EN-08

    See it on page 2, claim C-9f6b8123d8

14. C-beb33132a9

    No LOMA or LOMR is on file for these parcels.

    None on file for these parcels

    Standard Flood Hazard Determination - Tamsin Ridge Parcels 5, 9 and 10 · DR-0009 · Page 1 · 2023-03-15

    Source agency_determination · Claim type absence · Polarity absence · Confidence high · Quote check exact, 100 of 100

    See it on page 1, claim C-beb33132a9

15. C-d0039fd7b9

    Parcel 9 is in Zone AE with a regulatory floodway along Sallow Creek; the remainder is Zone X.

    Zone AE with regulatory floodway along Sallow Creek; remainder Zone X

    Standard Flood Hazard Determination - Tamsin Ridge Parcels 5, 9 and 10 · DR-0009 · Page 1 · 2023-03-15

    Source agency_determination · Claim type presence · Polarity presence · Confidence high · Quote check exact, 100 of 100

    See it on page 1, claim C-d0039fd7b9

16. C-db721b9fe7

    Landowners report Sallow Creek overtopped Linnet Road at the county bridge in the June 2019 flash flood.

    Landowners report that Sallow Creek overtopped Linnet Road at the county bridge during the

    Stormwater, Floodplain and Drainage Memo - Tamsin Ridge Solar and Storage Project · DR-0019 · Page 2 · 2023-06-05

    Source consultant_memo · Claim type presence · Polarity presence · Confidence medium · Quote check exact, 100 of 100

    Cited by EN-08 · Filed under AQ-02, EN-08

    See it on page 2, claim C-db721b9fe7

• Run a local hydraulic model for the 14 acres of fringe arrays; drop rows if flood levels exceed mapped levels.
• Keep all equipment out of the floodway.
• Show compliance with county floodplain rules in the OPSB application; ask the county floodplain administrator to confirm adopted flood-prone areas and permit position.

Agencies