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    "item_count": 6,
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        "figure": 2,
        "header": 2,
        "heading": 1,
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            "text": "NOAA 24-hr D 2 YR-C Rainfall=3.42\"\nPrinted 12/19/2025\nas LLC Page 43",
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            "level": 2
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            "text": "Analysis - Failure NOA\nPrepared by Civil Core Consulting\nHydroCAD® 10.20-8a s/n 13637 © 2025 HydroCAD Software Solutions LLC",
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            "level": 2
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            "text": "Pond 2P: Subusrface Infiltration Basin 1 - Chamber Wizard Field A",
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            "text": "Chamber Model = ADS N-12 36\" (ADS N-12® Pipe)\nInside= 36.1\"W x 36.1\"H => 7.10 sf x 20.00'L = 142.0 cf\nOutside= 42.0\"W x 42.0\"H => 8.86 sf x 20.00'L = 177.2 cf\n42.0\" Wide + 21.0\" Spacing = 63.0\" C-C Row Spacing\n4 Chambers/Row x 20.00' Long +3.50' Header x 2 = 87.00' Row Length +18.0\" End Stone x 2 = 90.00' Base Length\n5 Rows x 42.0\" Wide + 21.0\" Spacing x 4 + 18.0\" Side Stone x 2 = 27.50' Base Width\n6.0\" Stone Base + 42.0\" Chamber Height + 24.0\" Stone Cover = 6.00' Field Height\n20 Chambers x 142.0 cf + 24.50' Header x 7.10 sf x 2 = 3,187.9 cf Chamber Storage\n20 Chambers x 177.2 cf + 24.50' Header x 8.86 sf x 2 = 3,978.6 cf Displacement\n14,850.0 cf Field - 3,978.6 cf Chambers = 10,871.4 cf Stone x 40.0% Voids = 4,348.5 cf Stone Storage\nChamber Storage + Stone Storage = 7,536.4 cf = 0.173 af\nOverall Storage Efficiency = 50.8%\nOverall System Size = 90.00' x 27.50' x 6.00'\n20 Chambers\n550.0 cy Field\n402.6 cy Stone",
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