Instructions for Application to construct Drainage Improvements to Mitigate Stormwater Impacts from Alterations to Existing Single Family Residential Properties1.

Filling Instructions
Application to be completed by homeowner or their selected design professional, ﬁlling in project information, providing a brief description of the project including the increases in impervious coverage and building area. Intent to utilize standard mitigation or implement a custom system must be indicated.
For custom designed systems
Complete application
Provide review fee of $750 payable to Coral Springs Improvement District
Submit
Survey
Site Plan with site data
Plan of proposed improvements
Engineered calculations, plans and details
Retain the engineer to inspect and certify the completion of the permitted improvements.
When electing to utilize standardized mitigation
Complete application
Submit
Application
$250 review and inspection fee
Survey
Proposed Site Plan with site data depicting location of proposed drainage mitigation

1 This application is to request approval of storm water management (drainage) improvements to offset
additional drainage impacts associated with additional building coverage and increases to impervious areas.

Application for Modifications to Single Family Residences (SWM Impacts)

To Be Completed by Applicant	Project Information	
	Project Contact Info		Owner	
	Name:		Address:	
	Organization:			
	Phone:		Phone:	
	Email:		Email:	
	Project Details (description of work)	
		
	Areas	
	Component	Existing	New	Total	
	Building				
	Driveway				
	Patios, walks and pool				
	Other Impervious				
	Approach to Mitigating Storm Water Impacts (Select One)	
		Letter of No Objection (No fee)	
		Custom system designed by engineer1	
	
	Standard Mitigation2
4 LF of 3’x3’ exfiltration trench per 100 SF of new impervious plus
6 LF of 3’x3’ exfiltration trench per 100 SF of new building footprint (east basin) or
2 LF of 3’x3’ exfiltration trench per 100 SF of new building footprint (west basin)	
	Owner Authorization	
	By executing  this application,  I  agree to
construct the drainage and comply with the attached standard conditions of approval		

To qualify as mitigation the system installed must:
Receive runoff from existing and or proposed impervious components.
Incorporate measures to reduce or prevent debris entering the system.
Located outside of utility easements and beneath impervious surfaces to the greatest extent possible.
Locations selected for drainage components are subject to approval by CSID.
Incorporate a nuisance sump (a depressed area that will hold water when system performance is diminished).

1 Custom systems are subject to the review and approval by CSID. Custom systems require the engineer to certify the construction of the improvements consistent with the approved plan. Review fee for engineer designed systems is $750.
2 Standard mitigation consists of specific lengths of a 3’H x 3’W rock filled trench (see detail). The required length is computed based on increases in building footprint and increased impervious area. Mitigation requiring less than 6 LF of Exfiltration Trench is considered de minimis and does not require installation of trench. Review fee for projects utilizing standard mitigation is $250.

Standard Conditions

This permit runs with the land and is automatically transferred to the new owner following the sale or conveyance of this property.
Permittee or Permittee’s representative shall notify the District forty-eight (48) hours prior to commencing work.
A preconstruction meeting with CSID staff is required.
Construction authorized by this permit must be started within 24 months of the date of this letter and completed within 12 months of commencement of construction.
For custom systems it is the responsibility of the permit holder to retain the services of an engineer to inspect and certify construction of the project is in conformance with the approved plans. When standardized mitigation is utilized, inspection by CSID is required.
Permittee agrees to keep the system free and clear of sediment and debris and generally maintain the system in accordance with permit documents. Failure to maintain the system may result in enforcement action.
Permittee agrees to allow inspection of the drainage system covered by this permit at any time by the District.
Deviations from these plans for whatever reason require the prior approval of the Coral Springs Improvement District.
It is the Permittee’s responsibility to locate and protect any underground facilities prior to and during construction.
This Permit shall not convey to Permittee any property rights nor any rights of privileges other than those specified herein, nor relieve the Permittee from complying with any law, regulation or requirement affecting the rights of other bodies or agencies. All structures and works installed by Permittee hereunder shall remain the property of the Permittee.
A physical copy of this letter and approved plans must be available at the jobsite during construction.
Unauthorized encroachments into CSID property and easements must be removed.
Landscaping other than grass and ground cover is prohibited on CSID’s canal and water management areas (formerly known as canal rights of way). Trees, palms and shrubs are to be removed3 at the owner/applicant’s expense and the bank sodded.

3 Preservation of trees, palms, shrubs, and other encroachments onto CSID property if requested is subject to approval of a waiver/variance by the Coral Springs Improvement District Board of Supervisors. Email permits@csidfl.org for application.

Evaluation of SWM Improvements to Single Family Residences

CSID Use	Application Package Completeness Review	
	Provided	Missing/Incomplete	Component	
			Application	
			$750 Review fee for custom systems	
			$250 Review fee for standard mitigation	
			Survey	
			Site Plan with site data tabulations	
			Drainage Plan	
			Drainage Calculations	
			Drainage Details	
				
	Comments ( )1st Review ( ) 2nd Review ( )3rd Review	

		

		

		
		
	Evaluation and Action	
		Submittal incomplete. Return to owner/professional to address deficiencies	
		The application package is sufficient. Distribute for Review	
		No Objection to construction depicted on attached	
		Approved for construction (drainage improvements required)	
	
Reviewed by:	
Date:	
	
Approved by:	
Date:	

Name		
Address		

Evaluation of Constructed SWM Improvements to Single Family Residences

CSID Use	Certification Package Review – Custom System	
	N/A	Accept	Reject	Component	
				Signed	and	Sealed	Engineer’s
Certification	
				Record Plan / As built provided	
				Other	
	Field Verification by CSID for Standard Mitigation	
	N/A	Accept	Reject	Component	
				Exfiltration trench length	
				Exfiltration dimensions and materials	
				Connected to Impervious surfaces	
				Inlet protection	
				Maintenance sump	
	Comments ( )1st Review ( ) 2nd Review ( )3rd Review	

		

		
		
		Rejected due to listed deficiencies. Return to engineer and owner for correction.	
		Certification package accepted. Notify owner and certifying
engineer	
	
Reviewed by:	
Date:	

Approved by:	

Date:	

Name		
Address		

Rationale for Requiring Mitigation of Stormwater Impacts from the Construction of Additional Impervious Areas Associated with Single Family Residences
The Coral Springs Improvement District’s system of lakes, canals and pumps was designed to accommodate runoff from a mix of development types (single family, multi-family, commercial, etc.) with an aggregate impervious coverage of 33%. Two independent drainage studies commissioned by the District concluded that portions of the District were at increased risk of flooding and that the primary contributing factor was increased impervious coverage which had increased to 50%.

Impervious surfaces generate three times more stormwater runoff than the yard that is being replaced. To prevent the further degradation of flood protection, it was established that the construction of new impervious areas or increases to building coverage must be offset with the construction of appropriate drainage improvements. These drainage improvements may be custom designed or comport with the standard mitigation details and rates.