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City of Frisco Engineering Standards

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<strong>Engineering</strong> <strong>Standards</strong><br />

Figure 1: Downstream Assessment Flow Chart<br />

1. Does the development alter<br />

drainage patterns or add<br />

impervious area causing an<br />

increase in run<strong>of</strong>f?<br />

No<br />

Yes<br />

3. Is the site 20 acres or<br />

larger?<br />

Yes<br />

2. A Downstream<br />

Assessment is not<br />

required. Review<br />

other <strong>City</strong> related<br />

design criteria.<br />

No<br />

7. Perform Downstream<br />

Assessment using Unit<br />

Hydrograph Method per<br />

Section 4.02.C and<br />

4.2.E<br />

Yes<br />

4. On-Site Detention to<br />

existing conditions<br />

provided?<br />

No<br />

5. Provide an<br />

Adequate Outfall per<br />

Section 4.08.H.<br />

6. Perform Downstream<br />

Assessment per Section<br />

4.02.A and 4.02.B<br />

Section 4 – Drainage Design Requirements May 2012 Page 4-8

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