Flood Water Intrusion Volume Calculator
ANA›Life Services Authority›National Calculator Authority›Flood Water Intrusion Volume Calculator
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Flood Water Intrusion Volume Calculator
Calculate the volume of flood water intruding into a structure or enclosed area based on floor area dimensions and the depth of water intrusion. Results are provided in cubic feet, cubic meters, and gallons.
Structure / Area Length (ft)
Structure / Area Width (ft)
Water Intrusion Depth (inches)
Obstruction / Furniture Coverage (%)
Percentage of floor area occupied by furniture, walls, etc. (0–95%)
Calculate
function floCalc() { var resultDiv = document.getElementById('flo-result'); resultDiv.style.display = 'block';
var length = parseFloat(document.getElementById('flo-length').value); var width = parseFloat(document.getElementById('flo-width').value); var depthIn = parseFloat(document.getElementById('flo-water-depth').value); var obstruction = parseFloat(document.getElementById('flo-obstruction').value);
// --- Validation --- var errors = [];
if (isNaN(length) || length 95) errors.push('Obstruction percentage must be between 0 and 95.');
if (errors.length > 0) { resultDiv.innerHTML = 'Please fix the following:' + errors.map(function(e){ return ''; }).join('') + ''; return; }
// --- Core Calculations ---
// Convert depth from inches to feet var depthFt = depthIn / 12;
// Gross floor area (ft²) var grossAreaFt2 = length * width;
// Effective (net) floor area after obstruction deduction var effectiveFactor = 1 - (obstruction / 100); var netAreaFt2 = grossAreaFt2 * effectiveFactor;
// Flood water intrusion volume (ft³) // V = L × W × (1 - obstruction%) × d var volumeFt3 = netAreaFt2 * depthFt;
// Convert to cubic meters: 1 ft³ = 0.0283168 m³ var volumeM3 = volumeFt3 * 0.0283168;
// Convert to US gallons: 1 ft³ = 7.48052 gallons var volumeGal = volumeFt3 * 7.48052;
// Weight of water: 1 ft³ of fresh water ≈ 62.4 lb; 1 m³ ≈ 1000 kg var weightLb = volumeFt3 * 62.4; var weightKg = volumeM3 * 1000;
// Pump-out time estimate: typical sump pump 1/3 HP ≈ 2,000 gal/hr var pumpRateGalHr = 2000; var pumpHours = volumeGal / pumpRateGalHr; var pumpMin = pumpHours * 60;
// --- Format helpers --- function fmt(n, d) { return n.toLocaleString('en-US', {minimumFractionDigits: d, maximumFractionDigits: d}); }
// --- Output --- resultDiv.innerHTML = '### Results ' + '' + 'ParameterValue' + 'Gross Floor Area' + fmt(grossAreaFt2, 2) + ' ft² (' + fmt(grossAreaFt2 * 0.092903, 2) + ' m²)' + 'Net Effective Area (after obstructions)' + fmt(netAreaFt2, 2) + ' ft² (' + fmt(netAreaFt2 * 0.092903, 2) + ' m²)' + 'Water Depth' + fmt(depthIn, 2) + ' in (' + fmt(depthFt, 4) + ' ft)' + 'Intrusion Volume' + fmt(volumeFt3, 2) + ' ft³' + 'Intrusion Volume' + fmt(volumeM3, 3) + ' m³' + 'Intrusion Volume' + fmt(volumeGal, 1) + ' US gallons' + 'Approximate Water Weight' + fmt(weightLb, 0) + ' lb (' + fmt(weightKg, 0) + ' kg)' + 'Est. Pump-Out Time (2,000 gal/hr pump)' + fmt(pumpHours, 2) + ' hr (' + fmt(pumpMin, 0) + ' min)' + ''; }
#### Formula
Flood Water Intrusion Volume
V = L × W × (1 − O/100) × d
- V = Intrusion volume (ft³)
- L = Length of the structure or area (ft)
- W = Width of the structure or area (ft)
- O = Obstruction / furniture coverage (%)
- d = Water intrusion depth (ft) = depth in inches ÷ 12
Unit Conversions:
#### Assumptions & References
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