501 North 44
th
St, Suite 200 Phoenix AZ 85008 (602) 506-3301 (602) 506-3601 fax
Drainage Requirements - 707 Internet: www.maricopa.gov/planning 10/29/12
The master plan needs to be signed and sealed by an Arizona Registered Civil Engineer. The following information
will need to be provided for the Master Drainage Plan:
1. Offsite Hydrology- Need to determine the quantity, the entrance and exit points, and how the flow is to
be routed through the site.
2. Onsite Hydrology- Need to show how the flows are to be routed to retention basins. Need to determine
quantity for pre and post development conditions.
3. Onsite Retention- Need to retain water for the 100-year, 2-hour storm for the site, including adjacent right
of way. Determine volume needed and the size and location of basins
4. Retention Disposal – Provide preliminary design in accordance with Standard 6.10 for disposal of total
ponding volume within 36 hours.
5. Onsite Hydraulic Calculations – Need to show preliminary hydraulic analysis for any proposed channels or
watercourse encroachments.
6. Contours- Need to show natural and proposed contours or spot elevations on the plans.
7. Streets- Need to show the layout of major streets.
8. Floodplains- Need to show the delineated floodplain boundaries if the site is within a Federal Emergency
Management Agency’s (FEMA) special flood hazard area. Will also need to apply for a floodplain use
permit. Delineation of floodplains (non-FEMA) for major washes is required.
9. Erosion Setbacks- For washes and other water course channels an erosion setback will need to be
determined, which meets Arizona State Standard 5-96.
10. Floodplains – Need to show the delineated floodplain boundaries if the site is within a Federal Emergency
Management Agency’s (FEMA) special flood hazard area. Will also need to apply for Floodplain Use
Permit.
11. Erosion Setbacks – For washes and other watercourse channels an erosion setback will need to be
determined, which meets Arizona State Standard 5-96.
Since complex drainage systems may require more detailed information, a meeting should be arranged with
personnel from Drainage Review.
FEE*:
Master Plans (including Development Master Plans)
$ 6,000 + $ 10/acre (for each acre over 640 acres) maximum $ 80,000
Master Plans Amendments
$ 3,000 + $ 5/acre (for each acre over 640 acres) maximum $ 40,000
* See the Drainage Regulation for current fee schedule
SUBMIT 2 COPIES
Department
DRAINAGE REQUIREMENTS FOR