[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"learn-\u002Flearn\u002Fdata-sources\u002Fflood-susceptibility":3,"learn-related-data-sources\u002Fflood-susceptibility":265},{"id":4,"title":5,"body":6,"category":243,"createdAt":243,"cta":244,"description":247,"extension":248,"icon":249,"industry":243,"keywords":250,"meta":256,"navigation":257,"path":258,"province":243,"relatedPages":259,"section":261,"seo":262,"stem":263,"systems":243,"updatedAt":243,"__hash__":264},"learn\u002Flearn\u002Fdata-sources\u002Fflood-susceptibility.md","NRCan Flood Susceptibility: How Likely Land Is to Flood",{"type":7,"value":8,"toc":232},"minimark",[9,14,35,38,42,49,52,56,59,65,69,72,108,115,118,145,148,152,155,175,179,182,185,196,199,203],[10,11,13],"h2",{"id":12},"what-it-is","What it is",[15,16,17,18,22,23,26,27,30,31,34],"p",{},"Flood susceptibility describes how likely a piece of land is to flood, based on where floods have happened before and on the conditions that tend to come with them. ",[19,20,21],"strong",{},"Natural Resources Canada (NRCan)"," publishes a national Flood Susceptibility Mapping series, produced by the Canada Centre for Mapping and Earth Observation. Township Canada carries the ",[19,24,25],{},"present-day estimate",", which averages susceptibility over ",[19,28,29],{},"2000 to 2023"," at a ",[19,32,33],{},"30-metre"," resolution.",[15,36,37],{},"NRCan built the maps with XGBoost, a machine learning method that combines many small decision trees into one prediction. The model learns from historic flood events together with (1) land characteristics such as elevation, soil type, land cover, and vegetation, and (2) seasonal weather such as rainfall and temperature. NRCan ran the model many times on slightly different samples of the data to measure how stable its answers are.",[10,39,41],{"id":40},"what-it-carries","What it carries",[15,43,44,45,48],{},"Every 30 m cell carries one value from ",[19,46,47],{},"0 to 100",", NRCan's calibrated probability of flood susceptibility. A higher value means the land was more likely to flood in a given year over 2000 to 2023. There are no classes or cut-offs, so read it as a continuous scale.",[15,50,51],{},"Township Canada shows the values unchanged, in NRCan's own colour ramp: pale yellow for low values, through green and teal, to dark blue for high values. Lakes, rivers, and some nearshore waters also carry values and usually read high.",[10,53,55],{"id":54},"coverage-and-refresh","Coverage and refresh",[15,57,58],{},"The present-day estimate covers all of Canada, from Lake Erie to the Arctic islands. NRCan published it in March 2026, and we refresh the layer when NRCan releases a new edition.",[60,61,62],"blockquote",{},[15,63,64],{},"Contains information licensed under the Open Government Licence - Canada.\nSource: Natural Resources Canada - Flood Susceptibility Mapping.",[10,66,68],{"id":67},"how-township-canada-shows-it","How Township Canada shows it",[15,70,71],{},"Township Canada shows NRCan's flood susceptibility in two places:",[73,74,75,94],"ul",{},[76,77,78,81,82,85,86,89,90,93],"li",{},[19,79,80],{},"Map layer",": on every paid plan. Open ",[19,83,84],{},"Map Layers",", expand ",[19,87,88],{},"Natural",", and turn on ",[19,91,92],{},"Flood Susceptibility",". It draws from the national view down to street level and sits under the survey grid, so you can read each quarter section and LSD against it.",[76,95,96,99,100,103,104,107],{},[19,97,98],{},"Agriculture parcel report",": with the Agriculture Bundle, the ",[19,101,102],{},"Agriculture"," tab of a parcel report includes a ",[19,105,106],{},"Flood susceptibility"," card for Alberta, Saskatchewan, and Manitoba quarter sections. An LSD shows the card for the quarter section that contains it.",[15,109,110],{},[111,112],"img",{"alt":113,"src":114},"The Flood Susceptibility layer along the Red River south of Winnipeg, with the river valley in dark blue under the survey grid and the 0 to 100 legend in the Map Layers panel","\u002Fimages\u002Flearn\u002Fdata-sources\u002Fflood-susceptibility\u002Fflood-layer.webp",[15,116,117],{},"The report card answers two questions: how much of this land is flood-prone, and is that changing? It shows:",[119,120,121,127,133,139],"ol",{},[76,122,123,126],{},[19,124,125],{},"Acres of land scoring 50 or higher today",": the headline number, from NRCan's present-day estimate. For example, \"89 of 153 acres of land score 50 or higher today.\" The present-day estimate follows recent years closely rather than the 24-year average, so on land where susceptibility has risen it can sit above most of the bars in the history.",[76,128,129,132],{},[19,130,131],{},"The spread across four bands"," (0 to 24, 25 to 49, 50 to 74, and 75 to 100), in the same colours as the map layer, with today's average and 90th percentile. The 90th percentile is the value that 90% of the quarter's land sits at or below, so it shows how high the wettest part of the quarter reaches.",[76,134,135,138],{},[19,136,137],{},"The 2000 to 2023 history",": one bar per year from NRCan's annual maps, with the three highest years named. Along the Red River, for example, 2011 stands out, which was a major flood year there.",[76,140,141,144],{},[19,142,143],{},"The trend",": rising, falling, or no clear trend. We only call a direction when it passes a standard statistical test for trends and the change is at least 2 points a decade, about 5 points over the 24 years. Year-to-year swings are large, so \"no clear trend\" is the most common answer.",[15,146,147],{},"Open water is left out of every number on the card, because lakes and rivers read high on NRCan's maps and nobody farms or lends on a lake. The card reports the open-water share separately when it is 5% or more. A quarter that is mostly open water shows a short note instead of a score. Wetlands stay in, because flood-prone slough edges are part of the answer.",[10,149,151],{"id":150},"how-to-read-it","How to read it",[15,153,154],{},"NRCan intends these maps for patterns and trends at regional and national scales. In its own words, they are not meant for \"predicting flooding at individual properties or supporting engineering or building design decisions.\" How much weight to give the layer depends on your use case:",[73,156,157,163,169],{},[76,158,159,162],{},[19,160,161],{},"Screening a list of parcels",": use it to flag which quarter sections sit in higher-susceptibility ground, then look closer at those first.",[76,164,165,168],{},[19,166,167],{},"Planning across a region",": use it to compare river valleys, basins, and municipalities, where the 2000 to 2023 pattern is the signal.",[76,170,171,174],{},[19,172,173],{},"A decision about one property or structure",": treat it as context only, and rely on provincial flood hazard maps and site-specific assessment.",[10,176,178],{"id":177},"future-scenarios","Future scenarios",[15,180,181],{},"NRCan also publishes flood susceptibility under future climate conditions: 2050, 2070, and 2100, each under two emissions scenarios (SSP2-4.5 and SSP5-8.5). Township Canada does not show these for individual parcels yet, and here is why.",[15,183,184],{},"A climate signal should grow with time and be stronger under higher emissions. When we sampled 200 random locations across the Prairies, the future maps did neither:",[73,186,187,190,193],{},[76,188,189],{},"The typical value rose from 6 today to 39 in the future maps.",[76,191,192],{},"At 77% of locations, every future scenario sat above that location's own highest value from 2000 to 2023.",[76,194,195],{},"At 72% of locations, all six future maps returned the same value, and the higher-emissions scenario was no higher than the moderate one on balance.",[15,197,198],{},"NRCan's documentation notes that the future maps use temperature and precipitation, while the historic maps also use land cover and vegetation. A change in model inputs like that can shift the whole baseline, which would explain a single jump that does not change with the year or the scenario. On a parcel report, it would read as \"flood susceptibility rises sixfold by 2050\" almost everywhere, and we do not think that would be an honest reading. We will add the future scenarios to the report when they can be read with confidence.",[10,200,202],{"id":201},"related","Related",[73,204,205,212,218,224],{},[76,206,207],{},[208,209,211],"a",{"href":210},"\u002Fguides\u002Fmap-layers","Map layers guide",[76,213,214],{},[208,215,217],{"href":216},"\u002Flearn\u002Fdata-sources\u002Fdrought-monitor","Canadian Drought Monitor",[76,219,220],{},[208,221,223],{"href":222},"\u002Flearn\u002Fdata-sources\u002Fsoil-landscapes-canada","Soil Landscapes of Canada",[76,225,226],{},[208,227,231],{"href":228,"rel":229},"https:\u002F\u002Fopen.canada.ca\u002Fdata\u002Fen\u002Fdataset\u002F1074f781-85d3-4c86-86cb-fd1c339197dc",[230],"nofollow","NRCan Flood Susceptibility Mapping on the Open Government Portal",{"title":233,"searchDepth":234,"depth":234,"links":235},"",2,[236,237,238,239,240,241,242],{"id":12,"depth":234,"text":13},{"id":40,"depth":234,"text":41},{"id":54,"depth":234,"text":55},{"id":67,"depth":234,"text":68},{"id":150,"depth":234,"text":151},{"id":177,"depth":234,"text":178},{"id":201,"depth":234,"text":202},null,{"label":245,"href":246},"Turn on the flood layer","\u002Fapp\u002Fsearch","Natural Resources Canada's Flood Susceptibility Mapping shows how likely land across Canada was to flood from 2000 to 2023, at 30 m. Township Canada shows it as a map layer and summarises it for every quarter section in the Agriculture parcel report.","md","i-lucide-waves-arrow-up",[251,252,253,254,255],"flood susceptibility","NRCan flood mapping","flood risk map canada","flood prone land","quarter section flood",{},true,"\u002Flearn\u002Fdata-sources\u002Fflood-susceptibility",[216,222,260],"\u002Flearn\u002Fdata-sources\u002Fcli-land-capability","data-sources",{"title":5,"description":247},"learn\u002Fdata-sources\u002Fflood-susceptibility","k-rNCFydX0qCc0ZvIQ6C_QFo_khuwMVaccm8UN02LkU",[266,378,489],{"id":267,"title":268,"body":269,"category":243,"createdAt":243,"cta":363,"description":365,"extension":248,"icon":366,"industry":243,"keywords":367,"meta":372,"navigation":257,"path":260,"province":243,"relatedPages":373,"section":261,"seo":375,"stem":376,"systems":243,"updatedAt":243,"__hash__":377},"learn\u002Flearn\u002Fdata-sources\u002Fcli-land-capability.md","CLI Land Capability: the National Agricultural Baseline",{"type":7,"value":270,"toc":356},[271,273,284,286,297,299,306,311,313,329,335,337],[10,272,13],{"id":12},[15,274,275,276,279,280,283],{},"The ",[19,277,278],{},"Canada Land Inventory (CLI) Land Capability for Agriculture"," classifies every cultivable parcel in Canada into one of ",[19,281,282],{},"seven classes"," (1 is the best, 7 has no capability) plus Class O for organic soils and Class 8 for non-arable land. Mapped at 1:50,000, CLI has been the national agricultural-capability baseline used in valuation and policy since the 1960s.",[10,285,41],{"id":40},[15,287,288,289,292,293,296],{},"Each parcel carries its ",[19,290,291],{},"CLI class"," and a single-letter ",[19,294,295],{},"limiter"," code - for example M for moisture or T for topography - that explains why the parcel is rated where it is. Township Canada inverts and normalizes the class to a 0-100 score: Class 1 maps to 100, Class 4 to roughly 57, Class 7 to 14.",[10,298,55],{"id":54},[15,300,301,302,305],{},"CLI is a ",[19,303,304],{},"static reference"," layer: the class boundaries reflect the original 1960s-to-1980s mapping and are revised only occasionally. It is national in coverage. Because it is decades old, we treat it as one input among four, not the last word - field-level appraisal still requires on-the-ground verification.",[60,307,308],{},[15,309,310],{},"Contains information licensed under the Open Government Licence - Canada.\nSource: Agriculture and Agri-Food Canada - Canada Land Inventory.",[10,312,68],{"id":67},[15,314,315,316,319,320,324,325,328],{},"CLI is the ",[19,317,318],{},"capability component (30% weight)"," of the composite ",[208,321,323],{"href":322},"\u002Flearn\u002Fag\u002Fscore-methodology","Productivity Score",". The class and its limiter are shown on the ",[19,326,327],{},"Agriculture tab"," of the parcel report for context, but the limiter does not change the score on its own.",[15,330,331],{},[111,332],{"alt":333,"src":334},"The Climate capability card on the Agriculture tab showing CLI class 2, a CLI score of 85, and topography as the primary limiter","\u002Fimages\u002Flearn\u002Fdata-sources\u002Fcli-land-capability\u002Fcli-class-card.webp",[10,336,202],{"id":201},[73,338,339,344,350],{},[76,340,341],{},[208,342,343],{"href":322},"Productivity Score methodology",[76,345,346],{},[208,347,349],{"href":348},"\u002Flearn\u002Fdata-sources\u002Fagrasid-lsrs","AGRASID 4.1 and LSRS",[76,351,352],{},[208,353,355],{"href":354},"\u002Flearn\u002Fdata-sources\u002Faafc-land-use","AAFC Land Use v5",{"title":233,"searchDepth":234,"depth":234,"links":357},[358,359,360,361,362],{"id":12,"depth":234,"text":13},{"id":40,"depth":234,"text":41},{"id":54,"depth":234,"text":55},{"id":67,"depth":234,"text":68},{"id":201,"depth":234,"text":202},{"label":364,"href":246},"See capability on a parcel report","The Canada Land Inventory classifies every cultivable parcel into seven capability classes. Township Canada uses it as the 30% capability component of the Productivity Score.","i-lucide-bar-chart-3",[368,369,370,371],"CLI","canada land inventory","land capability","agricultural capability",{},[348,354,374],"\u002Flearn\u002Fdata-sources\u002Faafc-crop-inventory",{"title":268,"description":365},"learn\u002Fdata-sources\u002Fcli-land-capability","ORnfRk3l9wwuwze3B5THXG0wP1D7WU65YRotZZ24c5Q",{"id":379,"title":380,"body":381,"category":243,"createdAt":243,"cta":475,"description":477,"extension":248,"icon":478,"industry":243,"keywords":479,"meta":484,"navigation":257,"path":216,"province":243,"relatedPages":485,"section":261,"seo":486,"stem":487,"systems":243,"updatedAt":243,"__hash__":488},"learn\u002Flearn\u002Fdata-sources\u002Fdrought-monitor.md","Canadian Drought Monitor: Current Drought-Severity Polygons",{"type":7,"value":382,"toc":468},[383,385,394,396,411,413,420,425,427,444,450,452],[10,384,13],{"id":12},[15,386,275,387,389,390,393],{},[19,388,217],{},", published by Agriculture and Agri-Food Canada, releases drought-severity polygons every month. It classifies conditions on the standard ",[19,391,392],{},"D0 to D4"," scale: D0 abnormally dry, D1 moderate, D2 severe, D3 extreme, and D4 exceptional. Township Canada carries the current month's polygons.",[10,395,41],{"id":40},[15,397,398,399,402,403,406,407,410],{},"Each polygon carries a ",[19,400,401],{},"severity"," level and label and the month it is valid for. Township Canada intersects it with the quarter section to produce the ",[19,404,405],{},"current drought class"," shown on the report, and a ",[19,408,409],{},"drought modifier"," that nudges the Productivity Score down in proportion to severity (D0 leaves the score unchanged; D4 multiplies it by 0.85).",[10,412,55],{"id":54},[15,414,415,416,419],{},"The Drought Monitor is national and refreshes ",[19,417,418],{},"monthly, around the 10th",". Our current load carries the latest published month's polygons, typically spanning the milder D0 to D2 classes across the agricultural Prairies, with more severe classes appearing in dry years.",[60,421,422],{},[15,423,424],{},"Contains information licensed under the Open Government Licence - Canada.\nSource: Agriculture and Agri-Food Canada - Canadian Drought Monitor.",[10,426,68],{"id":67},[15,428,429,430,433,434,436,437,440,441,443],{},"Drought powers the ",[19,431,432],{},"Drought"," overlay and the drought card on the ",[19,435,327],{}," of the parcel report, and it is the present-condition ",[19,438,439],{},"modifier"," in the ",[208,442,323],{"href":322},". Two parcels with identical soil can score differently this month if one sits inside a D2 polygon.",[15,445,446],{},[111,447],{"alt":448,"src":449},"The Drought card on the Agriculture tab showing D0 Abnormally Dry on the severity scale with the Drought Monitor valid date","\u002Fimages\u002Flearn\u002Fdata-sources\u002Fdrought-monitor\u002Fdrought-card.webp",[10,451,202],{"id":201},[73,453,454,458,462],{},[76,455,456],{},[208,457,343],{"href":322},[76,459,460],{},[208,461,349],{"href":348},[76,463,464],{},[208,465,467],{"href":466},"\u002Flearn\u002Fdata-sources\u002Fcomposite-quarter-section-layer","Composite quarter-section layer",{"title":233,"searchDepth":234,"depth":234,"links":469},[470,471,472,473,474],{"id":12,"depth":234,"text":13},{"id":40,"depth":234,"text":41},{"id":54,"depth":234,"text":55},{"id":67,"depth":234,"text":68},{"id":201,"depth":234,"text":202},{"label":476,"href":246},"Check drought on a parcel report","The Canadian Drought Monitor publishes monthly drought-severity polygons. Township Canada uses the current month to modify the Productivity Score and flag drought on every parcel.","i-lucide-sun",[480,481,482,483],"canadian drought monitor","drought","D0 D1 D2 D3 D4","moisture deficit",{},[348,374,466],{"title":380,"description":477},"learn\u002Fdata-sources\u002Fdrought-monitor","0ihgRN_MGJdaiIbDgRu0lYrDf5b9BseCwTK1x0oPZgg",{"id":490,"title":491,"body":492,"category":243,"createdAt":243,"cta":584,"description":586,"extension":248,"icon":587,"industry":243,"keywords":588,"meta":593,"navigation":257,"path":222,"province":243,"relatedPages":594,"section":261,"seo":595,"stem":596,"systems":243,"updatedAt":243,"__hash__":597},"learn\u002Flearn\u002Fdata-sources\u002Fsoil-landscapes-canada.md","Soil Landscapes of Canada: the National Soil Fallback",{"type":7,"value":493,"toc":577},[494,496,514,516,526,528,539,544,546,552,558,560],[10,495,13],{"id":12},[15,497,498,501,502,505,506,509,510,513],{},[19,499,500],{},"Soil Landscapes of Canada (SLC) v3.2"," is Agriculture and Agri-Food Canada's national soil dataset, describing soil ",[19,503,504],{},"order and great group"," at roughly 1:1 million scale. Inside Alberta we use the finer ",[208,507,508],{"href":348},"AGRASID",", and detailed provincial soil survey polygons now cover Saskatchewan, British Columbia, and Manitoba too; ",[19,511,512],{},"SLC is the fallback"," that keeps soil context with you wherever a detailed survey does not reach.",[10,515,41],{"id":40},[15,517,518,519,521,522,525],{},"SLC contributes the soil ",[19,520,504],{}," for a quarter section, from which we derive an estimated productivity range where a measured LSRS score is not available. Because SLC is coarse, many quarter sections sit on a single polygon and receive an averaged value - so we ",[19,523,524],{},"label the fallback explicitly"," in the UI rather than presenting it as a measured score.",[10,527,55],{"id":54},[15,529,530,531,534,535,538],{},"SLC provides soil context across the Prairies and BC outside Alberta, covering ",[19,532,533],{},"hundreds of thousands of quarter sections"," where AGRASID does not reach, refreshed ",[19,536,537],{},"annually in March",".",[60,540,541],{},[15,542,543],{},"Contains information licensed under the Open Government Licence - Canada.\nSource: Agriculture and Agri-Food Canada - Soil Landscapes of Canada v3.2.",[10,545,68],{"id":67},[15,547,548,549,551],{},"SLC fills the soil card on the ",[19,550,327],{}," of the parcel report wherever a detailed survey does not reach, always labelled as the SLC fallback. Where detailed provincial soil survey polygons exist (Alberta, Saskatchewan, British Columbia, and Manitoba), the report leads with those instead of this coarse estimate.",[15,553,554],{},[111,555],{"alt":556,"src":557},"The Agriculture tab on a Saskatchewan parcel, with the note that the soil component uses an SLC estimate and the soil card showing the SLC soil order","\u002Fimages\u002Flearn\u002Fdata-sources\u002Fsoil-landscapes-canada\u002Fslc-fallback-card.webp",[10,559,202],{"id":201},[73,561,562,568,572],{},[76,563,564],{},[208,565,567],{"href":566},"\u002Flearn\u002Fhow-to\u002Fsoil-landscapes-canada-vs-lsrs","Soil Landscapes of Canada vs LSRS",[76,569,570],{},[208,571,349],{"href":348},[76,573,574],{},[208,575,576],{"href":260},"CLI Land Capability",{"title":233,"searchDepth":234,"depth":234,"links":578},[579,580,581,582,583],{"id":12,"depth":234,"text":13},{"id":40,"depth":234,"text":41},{"id":54,"depth":234,"text":55},{"id":67,"depth":234,"text":68},{"id":201,"depth":234,"text":202},{"label":585,"href":246},"See soil context on a parcel report","Soil Landscapes of Canada v3.2 is the national soil-order dataset. Township Canada uses it for soil context outside Alberta, where AGRASID does not reach.","i-lucide-globe",[589,590,591,592],"soil landscapes of canada","SLC","soil order","great group",{},[348,260,566],{"title":491,"description":586},"learn\u002Fdata-sources\u002Fsoil-landscapes-canada","AqEN-IO8g6d8NUsKXsBveo4PB04VODXI3JgsSD1cekc"]