diff --git a/alert_system/etl/base/extraction.py b/alert_system/etl/base/extraction.py
index fa916ee95..f7a1827ea 100644
--- a/alert_system/etl/base/extraction.py
+++ b/alert_system/etl/base/extraction.py
@@ -8,7 +8,7 @@
 from django.utils import timezone
 
 from alert_system.helpers import build_stac_search
-from alert_system.models import Connector, ExtractionItem, LoadItem
+from alert_system.models import Connector, ExtractionItem, ImpactDetailsEnum, LoadItem
 
 from .config import ExtractionConfig
 from .loader import BaseLoaderClass
@@ -267,7 +267,11 @@ def _impact_filter(self, impact_metadata: list[dict]) -> str:
         filters = []
 
         for data in impact_metadata or []:
-            if data.get("category") and data.get("type") and data.get("value") is not None:
+            if (
+                data.get("category") == ImpactDetailsEnum.Category.PEOPLE
+                and data.get("type") == ImpactDetailsEnum.Type.AFFECTED_TOTAL  # TODO: Add other possible types here.
+                and data.get("value") is not None
+            ):
                 filters.append(
                     f"monty:impact_detail.category = '{data['category']}' AND "
                     f"monty:impact_detail.type = '{data['type']}' AND "
diff --git a/alert_system/etl/gdacs_flood/transform.py b/alert_system/etl/gdacs_flood/transform.py
index 133cd4eb5..5a7be2df9 100644
--- a/alert_system/etl/gdacs_flood/transform.py
+++ b/alert_system/etl/gdacs_flood/transform.py
@@ -13,14 +13,14 @@ class GdacsTransformer(BaseTransformerClass):
     Extracts and normalizes impact fields, computes derived values, and stores metadata.
     """
 
-    # NOTE: This logic might change in future
+    # NOTE: This logic might change in future. Currently only creating a function for future use.
     def compute_people_exposed(self, metadata_list) -> Optional[int]:
         for data in metadata_list:
             if data["category"] == ImpactDetailsEnum.Category.PEOPLE and data["type"] == ImpactDetailsEnum.Type.AFFECTED_TOTAL:
                 return data["value"]
         return None
 
-    # NOTE: This logic might change in future
+    # NOTE: This logic might change in future. Currently only creating a function for future use.
     def compute_buildings_exposed(self, metadata_list) -> Optional[int]:
         """
         Compute the 'buildings_exposed' field.
@@ -30,28 +30,36 @@ def compute_buildings_exposed(self, metadata_list) -> Optional[int]:
                 return data["value"]
         return None
 
-    # NOTE: This logic will change with changes in montandon.
     def process_impact(self, impact_items) -> BaseTransformerClass.ImpactType:
-        metadata = []
+        meta_hash_map = {}
+
         for item in impact_items:
             properties = item.resp_data.get("properties", {})
-            impact_detail = properties.get("monty:impact_detail", {})
-            category = impact_detail.get("category")
-            type_ = impact_detail.get("type")
-            value = impact_detail.get("value")
-            if category == ImpactDetailsEnum.Category.PEOPLE and type_ == ImpactDetailsEnum.Type.AFFECTED_TOTAL:
-                metadata = [
-                    {
-                        "category": category,
-                        "type": type_,
-                        "value": value,
-                        "unit": impact_detail.get("unit", ""),
-                        "estimate_type": impact_detail.get("estimate_type", ""),
-                    }
-                ]
+            detail = properties.get("monty:impact_detail", {})
+
+            category = detail.get("category")
+            type_ = detail.get("type")
+            value = detail.get("value")
+            if value in (None, -1):
+                value = 0
+            key = (category, type_)
+            meta_hash_map[key] = meta_hash_map.get(key, 0) + value
+
+        metadata = [
+            {
+                "category": category,
+                "type": type_,
+                "value": value,
+            }
+            for (category, type_), value in meta_hash_map.items()
+            if category == ImpactDetailsEnum.Category.PEOPLE
+        ]
+
         return {
-            "people_exposed": self.compute_people_exposed(metadata),
-            "buildings_exposed": self.compute_buildings_exposed(metadata),
+            "people_exposed": meta_hash_map.get(
+                (ImpactDetailsEnum.Category.PEOPLE, ImpactDetailsEnum.Type.AFFECTED_TOTAL)  # Taking only people exposed.
+            ),
+            "buildings_exposed": meta_hash_map.get((ImpactDetailsEnum.Category.BUILDINGS, ImpactDetailsEnum.Type.DAMAGED)),
             "impact_metadata": metadata,
         }
 
diff --git a/alert_system/helpers.py b/alert_system/helpers.py
index 8f1b7d7cf..f873671c3 100644
--- a/alert_system/helpers.py
+++ b/alert_system/helpers.py
@@ -5,6 +5,8 @@ def build_search_params(
     collections: str,
     cql_filters: list[str] | None = None,
     extra_params: dict | None = None,
+    start_datetime: str | None = None,
+    end_datetime: str | None = None,
 ) -> dict:
     params = {
         "collections": collections,
@@ -15,6 +17,9 @@ def build_search_params(
         params["filter-lang"] = "cql2-text"
         params["filter"] = combined_filter
 
+    if start_datetime and end_datetime:
+        params["datetime"] = f"{start_datetime}/{end_datetime}"
+
     if extra_params:
         params.update(extra_params)
 
@@ -25,10 +30,6 @@ def build_guid_filter(guid: str) -> str:
     return f"monty:guid = '{guid}'"
 
 
-def build_datetime_filter(start_date: str, end_date: str) -> str:
-    return f"datetime >= '{start_date}' AND datetime < '{end_date}'"
-
-
 def build_stac_search(
     collections: str,
     guid: str | None = None,
@@ -41,11 +42,11 @@ def build_stac_search(
 
     if guid:
         filters.append(build_guid_filter(guid))
-    if start_datetime and end_datetime:
-        filters.append(build_datetime_filter(start_datetime, end_datetime))
 
     return build_search_params(
         collections=collections,
         cql_filters=filters,
         extra_params=extra_params,
+        start_datetime=start_datetime,
+        end_datetime=end_datetime,
     )