{"source":"Christchurch City Council open data: DistrictPlanB service, the flood-hazard layers (DPFloodManagement 30, DPFloodHazardHigh 25, DPFloodHazardHighResOverlay 29, DPFloodPonding 27, DPFloodMgmtLakeEllesmereArea 23)","generated":"2026-10-11T18:32:20.861Z","note":"Sampled join, a grid of points inside each suburb outline asks whether the plan’s flood layers hold it. `share` covers the high-hazard areas; `mgmt` the broader flood-management catchments; `pond` is a count of ponding-area records whose centroid lands inside; `ellesmere` flags the lake’s 2.74 m contour. A model’s map, not a promise.","suburbs":{"addington":{"n":0,"share":0,"ha":0,"mgmt":0.005,"catchments":["Bells Creek"],"pond":0,"ellesmere":false},"aranui":{"n":3,"share":0.03,"ha":6.7,"mgmt":0.393,"catchments":["Avon River"],"pond":0,"ellesmere":false},"avondale":{"n":9,"share":0.114,"ha":24.5,"mgmt":0.837,"catchments":["Avon River"],"pond":0,"ellesmere":false},"avonhead":{"n":0,"share":0,"ha":0,"mgmt":0.01,"catchments":["Avon River"],"pond":0,"ellesmere":false},"avonside":{"n":4,"share":0.091,"ha":10.9,"mgmt":0.716,"catchments":["Avon River"],"pond":0,"ellesmere":false},"beckenham":{"n":4,"share":0.051,"ha":3.7,"mgmt":0.167,"catchments":["Heathcote River"],"pond":0,"ellesmere":false},"belfast":{"n":3,"share":0.094,"ha":95.5,"mgmt":0.108,"catchments":["Lower Styx River"],"pond":0,"ellesmere":false},"bexley":{"n":3,"share":0.328,"ha":71.1,"mgmt":0.505,"catchments":["Avon River"],"pond":0,"ellesmere":false},"bishopdale":{"n":0,"share":0,"ha":0,"mgmt":0.466,"catchments":["Lower Styx River","Avon River"],"pond":0,"ellesmere":false},"bottle-lake":{"n":2,"share":0.021,"ha":25.6,"mgmt":0.308,"catchments":["Lower Styx River","Avon River"],"pond":14,"ellesmere":false},"bromley":{"n":1,"share":0.005,"ha":4.2,"mgmt":0.217,"catchments":["Heathcote River","Bells Creek"],"pond":0,"ellesmere":false},"brooklands":{"n":8,"share":0.389,"ha":284.8,"mgmt":0.517,"catchments":["Lower Styx River"],"pond":12,"ellesmere":false},"bryndwr":{"n":0,"share":0,"ha":0,"mgmt":0.256,"catchments":["Avon River"],"pond":0,"ellesmere":false},"burnside":{"n":0,"share":0,"ha":0,"mgmt":0.06,"catchments":["Avon River"],"pond":0,"ellesmere":false},"burwood":{"n":6,"share":0.273,"ha":160.3,"mgmt":0.65,"catchments":["Avon River"],"pond":0,"ellesmere":false},"casebrook":{"n":0,"share":0,"ha":0,"mgmt":0.41,"catchments":["Lower Styx River"],"pond":0,"ellesmere":false},"cashmere":{"n":0,"share":0,"ha":0,"mgmt":0.006,"catchments":["Heathcote River"],"pond":24,"ellesmere":false},"christchurch-central-city":{"n":0,"share":0,"ha":0,"mgmt":0.364,"catchments":["Bells Creek","Avon River"],"pond":0,"ellesmere":false},"coutts-island":{"n":4,"share":0.113,"ha":136.2,"mgmt":0,"catchments":[],"pond":0,"ellesmere":false},"cracroft":{"n":3,"share":0.15,"ha":40.4,"mgmt":0.246,"catchments":["Heathcote River"],"pond":9,"ellesmere":false},"dallington":{"n":6,"share":0.067,"ha":8.9,"mgmt":0.849,"catchments":["Avon River"],"pond":0,"ellesmere":false},"edgeware":{"n":0,"share":0,"ha":0,"mgmt":0.581,"catchments":["Avon River","Dudley Creek"],"pond":0,"ellesmere":false},"fendalton":{"n":0,"share":0,"ha":0,"mgmt":0.45,"catchments":["Avon River"],"pond":0,"ellesmere":false},"ferrymead":{"n":6,"share":0.253,"ha":62.6,"mgmt":0.858,"catchments":["Avoca Heathcote Valley","Heathcote River"],"pond":0,"ellesmere":false},"halswell":{"n":2,"share":0.013,"ha":29.4,"mgmt":0.187,"catchments":["Halswell","Heathcote River"],"pond":0,"ellesmere":false},"harewood":{"n":2,"share":0.04,"ha":45.8,"mgmt":0.023,"catchments":["Lower Styx River"],"pond":0,"ellesmere":false},"heathcote-valley":{"n":0,"share":0,"ha":0,"mgmt":0.043,"catchments":["Avoca Heathcote Valley","Heathcote River"],"pond":0,"ellesmere":false},"hillmorton":{"n":0,"share":0,"ha":0,"mgmt":0.032,"catchments":["Heathcote River"],"pond":0,"ellesmere":false},"hillsborough":{"n":1,"share":0.007,"ha":4.6,"mgmt":0.2,"catchments":["Heathcote River","Avoca Heathcote Valley"],"pond":0,"ellesmere":false},"hoon-hay":{"n":2,"share":0.118,"ha":45.4,"mgmt":0.425,"catchments":["Heathcote River"],"pond":9,"ellesmere":false},"huntsbury":{"n":0,"share":0,"ha":0,"mgmt":0.022,"catchments":["Heathcote River"],"pond":0,"ellesmere":false},"ilam":{"n":0,"share":0,"ha":0,"mgmt":0.197,"catchments":["Avon River"],"pond":0,"ellesmere":false},"kainga":{"n":2,"share":0.019,"ha":5.6,"mgmt":0.369,"catchments":["Lower Styx River"],"pond":0,"ellesmere":false},"kennedys-bush":{"n":5,"share":0.048,"ha":71,"mgmt":0.119,"catchments":["Lansdowne","Halswell","Heathcote River"],"pond":1,"ellesmere":false},"linwood":{"n":0,"share":0,"ha":0,"mgmt":0.456,"catchments":["Avon River","Bells Creek","Heathcote River"],"pond":0,"ellesmere":false},"little-river":{"n":0,"share":0,"ha":0,"mgmt":0.022,"catchments":["Lake Forsyth"],"pond":0,"ellesmere":false},"mairehau":{"n":6,"share":0.092,"ha":41.8,"mgmt":0.647,"catchments":["Avon River","Dudley Creek","Lower Styx River"],"pond":5,"ellesmere":false},"marshland":{"n":3,"share":0.031,"ha":27.1,"mgmt":0.149,"catchments":["Avon River","Lower Styx River"],"pond":1,"ellesmere":false},"mcleans-island":{"n":2,"share":0.018,"ha":100.4,"mgmt":0,"catchments":[],"pond":0,"ellesmere":false},"merivale":{"n":0,"share":0,"ha":0,"mgmt":0.552,"catchments":["Avon River","Dudley Creek"],"pond":0,"ellesmere":false},"moncks-bay":{"n":8,"share":0.106,"ha":4.1,"mgmt":0.335,"catchments":["Moncks Redcliffs"],"pond":0,"ellesmere":false},"mount-pleasant":{"n":0,"share":0,"ha":0,"mgmt":0.032,"catchments":["McCormacks Bay"],"pond":0,"ellesmere":false},"new-brighton":{"n":9,"share":0.14,"ha":56.7,"mgmt":0.705,"catchments":["Avon River","Southshore"],"pond":0,"ellesmere":false},"north-new-brighton":{"n":2,"share":0.022,"ha":4.4,"mgmt":0.151,"catchments":["Avon River"],"pond":0,"ellesmere":false},"northcote":{"n":0,"share":0,"ha":0,"mgmt":0.59,"catchments":["Lower Styx River"],"pond":0,"ellesmere":false},"northwood":{"n":2,"share":0.06,"ha":37.8,"mgmt":0.092,"catchments":["Lower Styx River"],"pond":0,"ellesmere":false},"opawa":{"n":2,"share":0.02,"ha":1.6,"mgmt":0.188,"catchments":["Heathcote River"],"pond":0,"ellesmere":false},"ouruhia":{"n":2,"share":0.209,"ha":156.2,"mgmt":0.383,"catchments":["Lower Styx River"],"pond":13,"ellesmere":false},"papanui":{"n":0,"share":0,"ha":0,"mgmt":0.393,"catchments":["Avon River","Lower Styx River"],"pond":0,"ellesmere":false},"parklands":{"n":0,"share":0,"ha":0,"mgmt":0.055,"catchments":["Avon River","Lower Styx River"],"pond":0,"ellesmere":false},"phillipstown":{"n":0,"share":0,"ha":0,"mgmt":0.774,"catchments":["Bells Creek","Heathcote River"],"pond":0,"ellesmere":false},"redcliffs":{"n":3,"share":0.028,"ha":5.4,"mgmt":0.176,"catchments":["Moncks Redcliffs","McCormacks Bay"],"pond":0,"ellesmere":false},"redwood":{"n":0,"share":0,"ha":0,"mgmt":0.312,"catchments":["Lower Styx River","Avon River"],"pond":1,"ellesmere":false},"riccarton":{"n":0,"share":0,"ha":0,"mgmt":0.147,"catchments":["Avon River"],"pond":0,"ellesmere":false},"richmond":{"n":0,"share":0,"ha":0,"mgmt":0.478,"catchments":["Avon River","Dudley Creek"],"pond":0,"ellesmere":false},"saint-albans":{"n":0,"share":0,"ha":0,"mgmt":0.553,"catchments":["Dudley Creek","Avon River"],"pond":0,"ellesmere":false},"saint-martins":{"n":4,"share":0.031,"ha":3.6,"mgmt":0.154,"catchments":["Heathcote River"],"pond":0,"ellesmere":false},"scarborough":{"n":0,"share":0,"ha":0,"mgmt":0.012,"catchments":["Sumner"],"pond":0,"ellesmere":false},"shirley":{"n":0,"share":0,"ha":0,"mgmt":0.269,"catchments":["Dudley Creek","Avon River"],"pond":0,"ellesmere":false},"somerfield":{"n":1,"share":0.006,"ha":1.6,"mgmt":0.108,"catchments":["Heathcote River"],"pond":0,"ellesmere":false},"south-new-brighton":{"n":6,"share":0.223,"ha":31,"mgmt":0.669,"catchments":["Southshore"],"pond":0,"ellesmere":false},"southshore":{"n":17,"share":0.379,"ha":41.6,"mgmt":0.661,"catchments":["Southshore"],"pond":0,"ellesmere":false},"spencerville":{"n":6,"share":0.116,"ha":33,"mgmt":0.759,"catchments":["Lower Styx River"],"pond":1,"ellesmere":false},"spreydon":{"n":0,"share":0,"ha":0,"mgmt":0.023,"catchments":["Heathcote River"],"pond":0,"ellesmere":false},"strowan":{"n":0,"share":0,"ha":0,"mgmt":0.321,"catchments":["Avon River","Dudley Creek"],"pond":0,"ellesmere":false},"sumner":{"n":0,"share":0,"ha":0,"mgmt":0.061,"catchments":["Sumner"],"pond":0,"ellesmere":false},"sydenham":{"n":0,"share":0,"ha":0,"mgmt":0.339,"catchments":["Bells Creek","Heathcote River"],"pond":0,"ellesmere":false},"upper-riccarton":{"n":0,"share":0,"ha":0,"mgmt":0.153,"catchments":["Avon River"],"pond":0,"ellesmere":false},"waimairi-beach":{"n":0,"share":0,"ha":0,"mgmt":0.121,"catchments":["Avon River"],"pond":0,"ellesmere":false},"wainoni":{"n":2,"share":0.04,"ha":5.7,"mgmt":0.222,"catchments":["Avon River"],"pond":0,"ellesmere":false},"waltham":{"n":0,"share":0,"ha":0,"mgmt":0.408,"catchments":["Bells Creek","Heathcote River"],"pond":0,"ellesmere":false},"westmorland":{"n":5,"share":0.169,"ha":42.4,"mgmt":0.41,"catchments":["Heathcote River"],"pond":1,"ellesmere":false},"woolston":{"n":1,"share":0.006,"ha":3.4,"mgmt":0.825,"catchments":["Heathcote River","Bells Creek","Avoca Heathcote Valley"],"pond":0,"ellesmere":false}}}