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City of Bisbee General Plan Update

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Opportunities and Constraints<br />

The study area embraces a series <strong>of</strong> known ground faults. The area has<br />

been designated as UBC2 (Universal Building Code 2) which requires<br />

construction to conform to standards based on criteria which includes an<br />

evaluation <strong>of</strong> earthquake risk zone.<br />

According to U.S. Geological Survey records, some faults in the area include<br />

the Dividend Fault, which parallels Tombstone Canyon and ends at Saginaw<br />

along Highway 80. The Quarry Fault, which extends south southwest from<br />

the Dividend through Naco Limestone to the east and Escabrosa limestone to<br />

the west, intersecting the Escabrosa Fault.<br />

The Escabrosa runs roughly west northwest and east southeast, terminating<br />

at Don Luis. About one mile south southwest <strong>of</strong> the Escabrosa is the Abrigo<br />

Fault, which terminates at the edge <strong>of</strong> the Espinal Plain one mile west <strong>of</strong> Don<br />

Luis.<br />

Southeast <strong>of</strong> Warren, an arching fault runs east <strong>of</strong> Black Gap foothill, and on<br />

the southerly side <strong>of</strong> Gold Hill, turning in a southerly direction into Mexico<br />

east <strong>of</strong> monument 85, benchmark 4443. East <strong>of</strong> Gold Hill is the Glance<br />

Overthrust Fault, a semi-circle around the peak southeast <strong>of</strong> Black Knob Hill.<br />

Hydrology<br />

<strong>Bisbee</strong> is located in the mountains which result in run-<strong>of</strong>f that is carried<br />

through washes. In the early years <strong>of</strong> Old <strong>Bisbee</strong> flood waters rushed through<br />

the streets. Conveyance <strong>of</strong> flood waters is now handled by way <strong>of</strong> the<br />

municipal culvert or subway in Tombstone Canyon. This storm water culvert<br />

began as early as 1910 and has been extended and rebuilt with the Work<br />

Project America (WPA) program in the 1930’s. Keeping the culvert clear <strong>of</strong><br />

debris and vegetation is a challenge and over the years floodwaters have<br />

taken their toll causing walls to be undermined and erosion in areas where<br />

the bed <strong>of</strong> the channel is unlined. The flatter areas <strong>of</strong> Warren and San Jose<br />

do not experience this same flood intensity. The <strong>City</strong> <strong>of</strong> <strong>Bisbee</strong> uses the<br />

Flood Insurance Rate Maps (FIRM) developed by the Federal Emergency<br />

Management Agency (FEMA).<br />

<strong>City</strong> <strong>of</strong> <strong>Bisbee</strong> <strong>General</strong> <strong>Plan</strong> <strong>Update</strong> 2003<br />

17 Volume I, Data and Analysis

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