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KING, STRAND, AND UNION STREETS - AlexandriaVA.Gov STRAND, AND UNION STREETS ... •Flood incidents on King Street will be shallower by 3” ... daphne.kott Created Date:

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Text of KING, STRAND, AND UNION STREETS - AlexandriaVA.Gov STRAND, AND UNION STREETS ... •Flood incidents...

  • City of Alexandria, Virginia

    KING, STRAND, AND UNION STREETS

    Park & Recreation Commission

    NOVEMBER 15, 2012

  • Daily High Tides for 2005-2011

    2

  • Daily High Tides for 2012

    3

    -1

    0

    1

    2

    3

    4

    5

    21-Jan

    24-Jan

    27-Jan

    30-Jan

    2-Feb

    5-Feb

    8-Feb

    11-Feb

    14-Feb

    17-Feb

    20-Feb

    23-Feb

    26-Feb

    29-Feb

    3-M

    ar

    6-M

    ar

    9-M

    ar

    12-M

    ar

    15-M

    ar

    18-M

    ar

    21-M

    ar

    24-M

    ar

    27-M

    ar

    30-M

    ar

    2-Apr

    5-Apr

    8-Apr

    11-Apr

    14-Apr

    17-Apr

    20-Apr

    23-Apr

    26-Apr

    29-Apr

    2-M

    ay

    5-M

    ay

    8-M

    ay

    11-M

    ay

    14-M

    ay

    17-M

    ay

    20-M

    ay

    23-M

    ay

    26-M

    ay

    29-M

    ay

    1-Jun

    4-Jun

    7-Jun

    10-Jun

    13-Jun

    16-Jun

    19-Jun

    22-Jun

    25-Jun

    28-Jun

    1-Jul

    4-Jul

    7-Jul

    10-Jul

    13-Jul

    16-Jul

    19-Jul

    22-Jul

    25-Jul

    28-Jul

    31-Jul

    3-Aug

    6-Aug

    9-Aug

    12-Aug

    15-Aug

    18-Aug

    21-Aug

    24-Aug

    27-Aug

    30-Aug

    2-Sep

    5-Sep

    8-Sep

    11-Sep

    14-Sep

    17-Sep

    20-Sep

    23-Sep

    26-Sep

    29-Sep

    2-Oct

    5-Oct

    8-Oct

    11-Oct

    14-Oct

    17-Oct

    20-Oct

    23-Oct

    26-Oct

    29-Oct

    1-Nov

    4-Nov

    7-Nov

    Daily High-High Tide Elevations (NAVD88)Jan 21 thru Nov 7, 2012

    DATE/TIME

    Max of ELEV

  • What causes the flooding?

    Some flooding is caused by

    rainfall

    - However -

    Most of the flooding is caused

    by tidal backups through the

    storm sewers on Strand, King

    and Union Streets

    4

  • 5

    Substantially reduce

    nuisance flooding

    raising the elevation of

    storm inlets

    Minimize impacts to

    private properties

    Minimize cost

    June 6th , 2012 @ 10:00 am

  • The existing lowest point is along Strand Street at Elevation 1.45

    Low points along King Street between Elevation 2.6 and 2.8

    6

  • Potomac River water surface elevations

    Elevations of existing building entrances

    Minimum slopes required for drainage

    Road and sidewalk design standards

    ADA compliance

    Cost

    7

  • Relocates the low point from Strand Street to King Street

    Raises lowest storm inlet opening from 1.45 to 2.66 (Alt.1) or 3.22 (Alt.2)

    Annual projected flood days will be reduced from 303 to 61 (Alt.1) or 13 (Alt.2)

    Impacts to properties:

    Mai Thai (remove internal ramp) (Alt.2 only)

    Stairwell (possibly reconstruct stairs and entrance) (Alt.2 only)

    Re-Grade Portion of Boat Club Parking Lot

    Cost estimate: $925,000, (Alt.1) or $1,150,000 (Alt.2)

    8

  • 9

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  • 11

  • 12

  • 13

  • Flooding on the Strand

    14

  • 15

  • 16

  • Depth of Flood Events

    17

    Approximate Annual Average Flood Depths

    For Existing Roadway Elevations

    Depth

    Greater

    Than

    Strand Street

    (Elev. 1.45)

    King Street

    (Elev. 2.43)

    King & Union Street

    (Elev. 3.22)

    6" 223 30 7

    1' 100 7 2

    1.5' 30 2