Volume 2-05, Chapter 3 - City of Wichita

Section 3.3.5 - Organic Filter
3.3.5
Organic Filter
Secondary Water Quality Facility
Description: Design variation of the surface sand filter
using organic materials in the filter
media.
KEY CONSIDERATIONS
DESIGN CRITERIA:
• Minimum head requirement of 5 to 8 feet
ADVANTAGES / BENEFITS:
• High pollutant removal capability
• Removal of dissolved pollutants is greater than sand
filters due to cation exchangee capacity
STORMWATER MANAGEMENT
SUITABILITY
Water Quality Protection
Channel Protection
On-Site Flood Control
Downstream
Flood Control
DISADVANTAGES / LIMITATIONS:
• Severe cloggingg potential if exposed soil surfaces exist
upstream
• Intended for hotspot or space-limited applications, or for
areas requiring enhanced pollutant removal capability
• High maintenance requirements
• Filter may require more frequent maintenance than most
of the other stormwater controls
MAINTENANCE REQUIREMENTS:
• Mow and stabilize the area draining to the
organic filter
• Remove sediment from filter bed
POLLUTANT
REMOVAL
H Total Suspended Solids
M Nutrients – Total Phosphorus & Total Nitrogen
Accepts Hotspo
Runoff: Yes
IMPLEMENTATION CONSIDERATIONS
L Land Requirements
H Relative Capital Costs
H Maintenance Burden
Residential Subdivision Use: No
High
Density/Ultra-Urban: Yes
Drainage Area: 10 acres max.
Soils: No restrictions
Other Considerations:
• Hotspot areas
L=Low M= =Moderate H=High
H
M
Metals
– Cadmium, Copper, Lead & Zinc
Pathogens – Coliform, Streptococci & E. Coli
Volume 2, Technical Guidance
Page 3 - 175