Riesgo natural: un mapa inicia preguntas
Watch the explanation and read its transcript on Riesgo natural: un mapa inicia preguntas. To continue your review, also read Estudio geotécnico para un terreno: cómo encargarlo y usarlo antes de decidir and Uso del suelo y POT: lo que un anuncio de lote no te cuenta.
Video, transcript and related readingA general map guides review; decisions must connect site conditions, project and required studies without promising zero risk.
Distinguish hazard, exposure and risk
A slope or stream alone cannot quantify the risk of a purchase. Law 1523 distinguishes hazard, exposure, vulnerability and disaster risk; their relationship helps identify the possible event, exposed people or assets and potential consequences. Avoid treating hazard and risk as interchangeable labels where a document defines different categories. The project also matters: vacant land and the same location containing homes, visitors or a road involve different exposed elements. Ask the professional to explain the terms in the map or study under review and their actual consequence. Do not infer safety merely because no event occurred within the seller's recollection. The decision needs technical evidence and applicable public rules. This initial clarity allows documents to be compared without turning a mapping category into an absolute guarantee or assuming any hazard automatically prevents every property use. The relevant question is how the actual proposal relates to the identified conditions and what evidence or restrictions govern the decision.
Check the map, scale, date and supporting instrument
Consult municipal instruments and relevant studies for the property's exact location. Establish the represented phenomenon, scale, date, version and associated instrument; a flood map does not necessarily answer landslide questions. Decree 1077 distinguishes basic planning studies and detailed studies within its framework. A general layer may guide enquiries without resolving conditions on a specific platform. Ask the technical adviser to connect folio, survey and location to avoid assessing another holding or a displaced point. If a proposed POT revision appears, distinguish its status from current rules and decisions; publishing a technical document does not itself demonstrate adoption. In Medellín and neighbouring municipalities, verify the mapping and procedure relevant to the actual jurisdiction. Retain the consulted file or reference and precision uncertainties. A useful result explains what can be concluded and what needs additional review rather than simply saying that the lot appears green. Each colour has meaning only within its legend, purpose and documentary context.
Use the visit to formulate technical questions
Record drainage, runoff, cuts, fill, observed cracks, walls, erosion and vegetation changes without making an amateur diagnosis. Ask about earlier events, repairs and neighbouring works, distinguishing testimony from records. A dry-weather visit may conceal water problems; a rainy visit also does not replace professional assessment or justify exposure to dangerous conditions. Request known technical records and authority actions from the seller. Ask the specialist which areas and features need examination, including land above or below the lot where relevant and lawful access is available. A flat platform may consist of fill whose history matters; garden finishes do not explain its behaviour. Keep located photographs and observation dates so they can be related to studies. The visit should produce a clear assignment rather than a commercial conclusion of stability based only on appearance, comfortable access or nearby houses. Those observations help target the assessment while the diagnosis and design remain tasks for appropriately qualified professionals.
Define the study the project needs
The assignment should describe location, intended use, buildings, access and earthworks together with the question being answered. A foundation geotechnical study and a hazard or risk analysis may interact without having identical scope. Ask the professional to specify methods, source material, investigation, limitations and deliverables, and check requirements with the competent authority. Relevant Decree 1077 provisions organise basic and detailed studies; requesting a safety certificate with a predetermined conclusion is insufficient. Identify the signatory and technical responsibility accepted within the assignment. Missing data or access should be acknowledged in the report with an explanation of their consequence. Request recommendations and restrictions connected to understandable drawings. A housing supplier may use studies in design, but its commercial offer does not replace site assessment. The buyer needs to know whether available information supports a decision or further investigation is required before fixing the layout and budget. Agree how changes to the project will be assessed against the study's original assumptions.
Assess mitigation through design, feasibility and maintenance
Do not consider a problem solved merely because someone proposes a wall or drain. Assessment should explain whether the intervention is technically suitable, legally permissible and economically feasible for the identified conditions. Law 388 includes protection land associated with hazards and nonmitigable risk for settlements; a private promise of works does not itself change that classification. Where mitigation is assessed, obtain design, permissions, responsibility, sequence and maintenance requirements rather than assuming partial execution allows occupation everywhere. Consider consequences for neighbours, waterways and roads; redirecting water within the lot may transfer it elsewhere and need further assessment. Costs should follow actual solutions and quotations with justified contingencies instead of an arbitrary percentage. Ask how the result will be verified and which public decisions remain outstanding. Mitigation may reduce risk within defined limits but should not be advertised as absolute elimination of every event or automatic project approval. The purchase decision must reflect the complete intervention and continuing obligations rather than only its first construction stage.
Example: the house fits but access depends on a slope
A purchaser finds a platform apparently large enough for the intended home. Access crosses a cut slope that neighbours say has needed repairs following rain. The seller focuses on the flat area and offers to repair the track with machinery. The buyer requests assessment of platform, access, drainage and surroundings as one project. Review may reveal that reliable access and necessary works change cost or feasibility even though the house occupies little land. This hypothetical example does not diagnose a landslide or claim every cut is unsafe. It demonstrates that assessment cannot stop at the exact foundation location. If access crosses another property, rights and responsibilities also require review. Options may include another layout, a technically supported solution or declining the purchase where conditions and costs do not suit the project. An enjoyable viewing cannot replace that documented comparison. The file should explain the whole operating arrangement, including how residents, deliveries and maintenance would reach the house under the conditions being evaluated.
Translate outstanding conclusions into clear conditions
If the study is essential, define with advice the information or result needed before proceeding and who will arrange it. Avoid a clause declaring the land completely safe without support or allowing any report to count as performance. The preliminary agreement should connect the actual project, outstanding steps and legal consequences. If the seller undertakes works, identify design, scope, verification, maintenance and relevant permissions. Do not treat an announcement of future municipal works as secured financing or an available solution. Ask what happens if the study recommends restrictions, the authority needs further evidence or costs become incompatible with the project. The purchaser should understand the accepted risk and dependencies on third parties. Preserve design versions and responses so alterations do not silently undermine reviewed assumptions. Financial assessment should include maintenance, access and potential lending or insurance limitations, checked against actual institutional terms. Contractual allocation of responsibility does not substitute for the technical evidence needed to understand the site and proposed occupation.
Maintain assessment after purchase
Keep studies, drawings, decisions and recommendations in the file and communicate obligations to whoever operates or maintains the property. Before extending, cutting ground, placing fill or changing drainage, review the effect on assessed conditions and necessary permissions. Record later observations and refer them through the appropriate professional or institutional channel instead of making improvised diagnoses. Where an official alert or instruction exists, use current information and follow the competent response for the situation. Law 1523 integrates knowledge, reduction and management of risk; purchase does not turn that process into a one-time check never revisited. This guide received editorial review on 14 October 2026 and certifies neither stability nor safety of any lot. Applicable maps, studies and requirements depend on municipality, phenomena and actual project. A useful conclusion identifies limitations and follow-up tasks supported by sufficient evidence, keeping technical, legal and financial decisions distinct. The retained file should help future advisers understand both the original assessment and material changes since it was prepared.
Evidence table by scale and decision
Compare the question answered by each document and what remains unresolved. A general map and detailed study are not interchangeable evidence. This table organises investigations and decisions without diagnosing property risk.
| Review question | Evidence to record | Next action |
|---|---|---|
| What does the reference map show? | Authority, layer, date, scale, legend, coverage and property location used in the enquiry. | Seek interpretation of categories and precision; no visible impact on a screen is not a safety guarantee. |
| What was observed on site, and when? | Located photographs, weather, access, water, observed movement or works and available background. | Take observations to the professional and record visit limits; a visual impression is not a technical study. |
| Which project defines the technical investigation? | Use, occupancy, loads, excavation, siting and written study scope with its inputs. | Commission the answer needed for that decision; check relevance before applying a report from another design. |
| What conditions any possible mitigation? | Findings, works, responsibilities, maintenance, quoted costs and public decisions requiring review. | Check overall feasibility and obligations; do not reduce the solution to budgeting for one isolated work. |
| Which change requires renewed review? | New design, observed event, changed territorial information or relevant maintenance condition. | Define follow-up and the relevant enquiry; retain the project version addressed by each conclusion. |
Sources & bibliography
Read the full document, its date, amendments and scope. The editorial review date describes this page; it does not establish an authorisation or a specific answer about your plot or financing.
- 01Ley 1523 de 2012 · arts. 2, 4 y 39-42; conceptos, responsabilidad y planificación del riesgocancilleria.gov.co · National
- 02Ley 388 de 1997 · arts. 10 y 35; determinantes y riesgo no mitigablecancilleria.gov.co · National
- 03Decreto 1077 de 2015 · arts. 2.2.2.1.3.1.1-1.4; estudios básicos y detallados; PDF Minvivienda actualizado 11 de abril de 2025minvivienda.gov.co · National