ISO Mitigation Analysis-Drive Distance

Collin County

Existing Plan

Plan 1

Plan 2

Plan 3

The Insurance Services Office (ISO) rating of an area is closely associated to the insurance premiums assessed within that specific area. In this case, the rating reflects the resources of the City of Wylie and its Fire and Rescue Department.

The Wylie Fire and Rescue Department requested that Collin County GIS validate its current Standard Response District (SRD). The task involved network analysis to calculate travel distances for fire engines. The study sought to examine Wylie's needs and plan for the placement of additional fire stations, which would extend services, accommodate future growth, and maintain Wylie's highest rating of ISO (1).

ArcGIS Network Analyst was used to delineate the SRD, which is composed of 1.5-mile drive distance buffers for each fire station. The map includes four plans: the current plan and three suggested plans. The proposed plans suggest either adding or moving a station and adding a new road. Each plan changes the SRD area and thus the number of hydrants in the SRD. The goal of this analysis was to assist and support Wylie in its decision while following the recommendations and requirements outlined in Hickey's Fire Suppression Rating Schedule Handbook. The best choice is the plan that serves the highest number of people (parcels) and includes the greatest number of hydrants in the SRD.

Courtesy of Collin County GIS.

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