SW3161003_Discrepancies_20200925

Noted SCM Design/Sizing Discrepancies: Original Permit (2016)Vs. Minor Mod Submission (2020)
NOTE:This is not an exhaustive list of discrepancies between the originally issued permit and the
7/2/2020 minor modification submission (As this was only a precursory review preformed to determine
if this submission could qualify as a minor modification) but it is illustrative as to the degree of
difference between the two submissions.
- Storage Volumes/Cross-Sectional Areas
o SCM #1
■ 2016
Contour Cross-Sectional Incremental Cumulative
Elevation (ft) Area (sf) Volume (cf) Volume (cf)
709.5 0 0 0
710.5 3615 1808 1808
711.5 10694 7155 8962
712.5 16369 13532 22494
713.5 20464 18417 40910
714.5 22942 21703 62613
715.5 25463 24203 86816
716.5 28041 50983 113596
■ 2020
Contour Cross-Sectional Cumulative
Elevation (ft) Area (sf) Volume (cf)
709 9268 0
710 10852 10040
711 12513 21701
712 14251 35060
713 16066 50194
714 17957 67180
715 19925 86093
716 21970 107012
o SCM #2
■ 2016
Contour Cross-Sectional Incremental Cumulative
Elevation (ft) Area (sf) Volume (cf) Volume (cf)
697 0 0 0
698 4649 2325 2325
699 8244 6447 8771
700 9508 8876 17647
701 10825 10167 27814
702 12198 11512 39325

• 2020
Contour Cross-Sectional Cumulative
Elevation (ft) Area (sf) Volume (cf)
697 4830 0
698 5863 5333
699 6958 11729
700 8105 19246
701 9304 27935
702 10554 37847
703 11857 49035
Drawdown Orifice Diameter Size
o SCM #1
■ 2016—3.5"
■ 2020—1.3"
o SCM #2
■ 2016—2.5"
■ 2020—1.5"
Emergency Spillway Elevation
o SCM #1
■ 2016-715.75'
■ 2020—715.00'
o SCM #2
■ 2016—701.00'
■ 2020—702.00'
Outlet Structure Configuration
o (See below)

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