Chapter 13.25
SURFACE WATER MANAGEMENT
Sections:
Article I. General Considerations
13.25.115 Adopting King County Surface Water Codes.
Article II. Storm Drainage
13.25.230 Excavation and backfill.
13.25.240 Street patching and restoration.
13.25.250 Roof downspout controls.
13.25.260 Storm drainage inventory.
13.25.270 Operation and maintenance.
Article III. Erosion Control
13.25.330 Erosion and sediment control/road cleaning financial guarantee.
13.25.340 Final stabilization.
Article I. General Considerations
13.25.110 General.
This chapter sets forth the minimum surface water management requirements for the City of University Place. Surface water management includes the design, construction, operation and maintenance of storm drainage and erosion control facilities and practices.
(Ord. 518 § 1, 2008; Ord. 395 § 3, 2003).
13.25.115 Adopting King County Surface Water Codes.
Chapter 9.04 and Section 16.82.100 of the King County Municipal Code are hereby adopted and incorporated herein fully by this reference with the exceptions enumerated below.
A. All references within these codes to King County or County shall be construed to be the City of University Place.
B. All references to King County Departments shall be construed to be the City of University Place Engineering Department.
C. Section 9.04.020.Z.3 is hereby revised to read:
Has a project site of fifty acres or more within a critical aquifer recharge area, as defined in UPMC 17.20.
D. Section 9.04.020.VV is hereby revised to read:
“Surface Water Design Manual” means the manual, and supporting documentation referenced or incorporated in the manual, describing surface and storm water design and analysis requirements, procedures and guidance that has been formally adopted in UPMC 13.05.320.
E. Section 9.04.030(4) is hereby revised to read:
Contains or is adjacent to a flood hazard area as defined in UPMC 17.30.
F. Section 9.04.050(A)(7) is hereby revised to read:
Financial guarantees and liability. All drainage facilities constructed or modified for projects, except downspout infiltration and dispersion systems for single family residential lots, must comply with the liability requirements of K.C.C. 9.04.100 and the financial guarantee requirements of UPMC 13.05 Article VI.
G. Section 9.04.050(C)(4) is hereby revised to read:
A request for an adjustment shall be processed in accordance with the procedures specified in the Surface Water Design Manual and UPMC 13.05.
H. Section 9.04.050(D) is hereby revised to read:
The drainage review requirements in this section and in the Surface Water Design Manual may be modified or waived under the procedures in UPMC 13.05.
I. Section 9.04.095 is hereby revised to read:
Vesting period for lots in final short plats. Unless the department finds that a change in conditions creates a serious threat to the public health or safety in the short subdivision, for a period of five years after recording, a lot within a short subdivision shall be governed by the provisions of this chapter in effect at the time a fully completed application for short subdivision approval was filed in accordance with UPMC 22.05.
J. The last sentence of Section 9.04.100 is hereby revised to read:
If this liability insurance is not kept in effect as required, University Place may initiate enforcement action pursuant to Chapter 1.20 UPMC and/or Chapter 1.30 UPMC at the City’s discretion.
K. Section 9.04.140(A)(1) is hereby revised to read:
The director is authorized to promulgate and adopt administrative rules under the procedures specified in UPMC 13.05 for the purpose of implementing and enforcing the provisions of this chapter.
L. Section 9.04.196 is hereby deleted.
M. Section 16.82.100(A)(2) is hereby revised to read:
All disturbed areas including faces of cuts and fill slopes shall be prepared and maintained to control erosion in compliance with UPMC 13.25 Article III.
(Ord. 688 § 1 (Exh. E), 2017; Ord. 555 § 1, 2009).
13.25.120 Design standards.
A. The King County Surface Water Design Manual (KCSWDM) and the King County Stormwater Pollution Prevention Manual and the portions of the King County Road Standards referenced therein are hereby adopted and incorporated fully into this chapter by this reference. The King County Surface Water Design Manual sets forth the drainage and erosion control requirements as supplemented herein. In these documents, all references to King County or the County shall be construed to refer to the City of University Place; all references to the King County Department of Development and Environmental Services (DDES) or the Water and Land Resources Division of the King County Department of Natural Resources (WLR) shall be hereby revised to read the City of University Place Engineering Department or such other department as the City Manager may designate to enforce this chapter.
B. The design standards shall be applied in the following hierarchy of precedence:
1. University Place Municipal Code;
2. King County Surface Water Design Manual;
3. King County Stormwater Pollution Prevention Manual;
4. King County Road Standards;
5. Washington State Department of Transportation (WSDOT) Standard Specifications for Road, Bridge, and Municipal Construction;
6. WSDOT Design Manual;
7. WSDOT Construction Manual.
C. The term “critical drainage area” in the King County Surface Water Design Manual shall have the meaning of “critical area” as defined in Chapter 13.05 UPMC, Article II, and classified in UPMC Title 17.
D. The term “landslide hazard drainage area” in the King County Surface Water Design Manual shall have the meaning of “landslide and erosion hazard area” as defined in Chapter 13.05 UPMC, Article II, and classified in UPMC Title 17.
E. A site development permit is added to the permits and approvals listed in Section 1.1.1 of the King County Surface Water Design Manual.
F. Core Requirement No. 3, “Impervious Surface Performance Exemption,” of the KCSWPM is deleted and not in effect.
G. Core Requirement No. 5 provision for the allowance for projects in the residential zone that result in no more than four percent total impervious surface and no more than 15 percent pervious surface is deleted and not in effect.
H. Soil equality and depth criteria located in reference Section 4-A of the KCSWPM are hereby specifically adopted by reference as the sole criteria.
I. King County’s approved method for modeling impervious area for rain garden credits in the KCSWDM is hereby specifically adopted by reference as the method for determining credits for Treatment under Minimum Requirement No. 6.
J. Department of Ecology Stormwater Manual Wetlands Provisions Adopted. Minimum Requirement No. 8 of Appendix 1 of the Washington State Department of Ecology Stormwater Manual and Ecology’s Guide Sheets 1B and 2B are hereby adopted and incorporated herein fully by this reference.
K. The Washington State Department of Ecology Stormwater Management Manual for Western Washington is accepted as an alternative design standard to the King County Surface Water Design Manual.
(Ord. 679 § 1 (Exh. A), 2016; Ord. 555 §§ 1, 2, 2009; Ord. 518 § 1, 2008; Ord. 423 § 40, 2004; Ord. 395 § 3, 2003).
Article II. Storm Drainage
13.25.210 Design.
A. When a storm drainage report is required, it must include any relevant data from the City comprehensive storm water plan.
B. The Leach Creek and Chambers Creek Drainage Basins are hereby designated as conservation flow control areas as defined in the KCSWDM.
C. The Morrison Pothole Drainage Area (sub-basin within the North Day Island Drainage Basin) is hereby designated as a flood problem flow control area as defined in the KCSWDM.
D. All other drainage basins are hereby designated as basic flow control areas as defined in the KCSWDM.
E. Certain portions of the storm system on 27th Street West within the Day Island Waterway Basin have been identified as a conveyance system nuisance problem (Type 1 downstream problem) as defined in the KCSWDM. Additional flow control, as identified in the KCSWDM, or system improvements are required for development projects that are tributary to the deficient portions of the system.
F. The Crystal Springs Creek Drainage Basin has been identified to have a severe erosion problem (Type 2 downstream problem) as defined in the KCSWDM.
G. For the purpose of rainfall modeling, the City of University Place will be considered to have the same rainfall characteristics as the City of Federal Way.
H. Low impact development design techniques shall be incorporated into storm drainage system designs when feasible in accordance with the Department of Ecology Stormwater Management Manual for Western Washington and the King County Surface Water Design Manual.
(Ord. 679 § 1 (Exh. A), 2016; Ord. 531 § 1 (Exh. A), 2008; Ord. 518 § 1, 2008; Ord. 395 § 3, 2003).
13.25.220 Construction.
All workmanship and materials shall be in accordance with the UPMC, KCSWDM, King County Road Standards, and the Standard Specifications.
(Ord. 518 § 1, 2008; Ord. 395 § 3, 2003).
13.25.230 Excavation and backfill.
All excavation and backfill of storm drainage facilities shall be in conformance with UPMC 13.20.260.
(Ord. 518 § 1, 2008; Ord. 395 § 3, 2003).
13.25.240 Street patching and restoration.
All street patching and restoration shall be in conformance with UPMC 13.20.265.
(Ord. 518 § 1, 2008; Ord. 395 § 3, 2003).
13.25.250 Roof downspout controls.
Roof downspout systems that tie into storm drainage facilities shall be constructed in accordance with the plumbing code as adopted by UPMC Title 14 and the following criteria:
A. Connections to the storm drainage facility must be made at a catch basin. Connections made in the right-of-way or public easement require a right-of-way permit.
B. Roof downspouts systems installed in conjunction with work performed under a building permit will be administered under that permit.
(Ord. 518 § 1, 2008; Ord. 395 § 3, 2003).
13.25.260 Storm drainage inventory.
All new and modified storm drainage facilities will be mapped on the University Place G.I.S. inventory system. The storm drainage inventory fee to be adopted shall be paid by the applicant at the time of permit issuance.
(Ord. 555 § 1, 2009; Ord. 518 § 1, 2008; Ord. 395 § 3, 2003).
13.25.270 Operation and maintenance.
Operation and maintenance of all drainage facilities is the responsibility of the applicant or property owner, except for those facilities for which the City assumes operation and maintenance responsibility as described below.
A. Drainage Facilities to Be Maintained by Private Parties.
1. Prior to permit issuance, the applicant shall be required to record a storm drainage maintenance agreement and restrictive covenant with the Pierce County Auditor. The form for this document is available at the City of University Place permit counter. The Operation and Maintenance Manual, as described below, will be included as an attachment to the agreement.
2. All privately owned drainage facilities must be maintained as specified in the King County Surface Water Design Manual. A copy of the Operation and Maintenance Manual submitted as part of the permit application shall be retained on site and shall be transferred with the property to any new owner. The property owner(s) shall keep a record of all maintenance activity indicating when the maintenance occurred and where waste was disposed of. These records shall be available for inspection by the City. The City may inspect all privately owned drainage facilities for compliance with these requirements. If property owner(s) fail to maintain their facilities, the City may issue a written notice specifying required actions. If these actions are not performed in a timely manner, the City may enter the property to perform the actions needed. The property owner is responsible for the costs incurred by the City. In the event an imminent hazard to public safety or the environment exists, written notice may not be required. Actions performed by the City on privately owned drainage facilities do not constitute an official assumption of operation and maintenance of these facilities.
3. An easement must be recorded granting right-of-access to the City for all storm facilities in accordance with Chapter 13.10 UPMC. The easement must also be depicted and described on the face of the plat, short plat, final development plan, or binding site plan.
B. Drainage Facilities to Be Maintained by the City.
1. Drainage facilities to be owned and operated by the City must be located in a tract or right-of-way dedicated to the City. Access roads serving these facilities must also be located in the tract or right-of-way and must be connected to an improved public road right-of-way. Any dedications shall be in conformance with Chapter 13.10 UPMC.
2. The City will provide written notification to the applicant, officially assuming maintenance and operation of these facilities only after each of the following has been met:
a. The Design Engineer has submitted a certification that the work has been completed per the approved design. The certification shall be as prescribed in UPMC 13.05.820.
b. The City has accepted a maintenance financial guarantee from the applicant or property owner as prescribed in Chapter 13.05 UPMC, Article VI.
c. The City has issued a written, final approval of the constructed facility to the applicant or property owner.
d. A minimum of 85 percent of the homes in the development have been occupied.
e. All of the public improvements required to be constructed by the applicant have been completed and accepted by the City.
f. The storm drainage system is free of all sediment and debris.
(Ord. 518 § 1, 2008; Ord. 395 § 3, 2003).
Article III. Erosion Control
13.25.310 General.
All proposed projects that will clear, grade or otherwise disturb a site must provide erosion and sediment controls to prevent, to the maximum extent possible, the transport of sediment from the project site to downstream drainage facilities, water resources, and adjacent properties. Both temporary and permanent erosion and sediment controls shall be designed, implemented and maintained as described in Section 1.2.5 and Appendix D of the King County Surface Water Design Manual.
(Ord. 518 § 1, 2008; Ord. 395 § 3, 2003).
13.25.320 Maintenance.
All erosion and sediment control measures shall be maintained and inspected on a regular basis as prescribed in Appendix D of the KCSWDM. The applicant shall designate an erosion and sedimentation control (ESC) supervisor who shall be responsible for maintenance and inspection of the erosion and sedimentation control measures for compliance with all permit conditions relating to erosion and sediment control as described in Appendix D. The ESC supervisor will be responsible to submit reports to the City for each inspection of the site. Section D.5.4 of Appendix D of the King County Surface Water Design Manual sets forth the minimum schedule for erosion and sediment control reviews/inspections. For sites within or impacting sensitive areas, the City may require the ESC supervisor to be a licensed professional engineer with demonstrated expertise in erosion and sediment control. This professional shall be designated as a special inspector in conformance with Chapter 13.05 UPMC, Article VII.
(Ord. 518 § 1, 2008; Ord. 395 § 3, 2003).
13.25.330 Erosion and sediment control/road cleaning financial guarantee.
Prior to permit issuance, the applicant must submit to the City a financial guarantee, guaranteeing the performance and maintenance of the erosion and sedimentation control facilities. The financial guarantee shall be as specified in Chapter 13.05 UPMC, Article VI.
(Ord. 518 § 1, 2008; Ord. 395 § 3, 2003).
13.25.340 Final stabilization.
Prior to obtaining final construction approval and the release of financial guarantees, the site shall be stabilized, structural erosion and sediment control measures (such as silt fences and sediment traps) shall be removed and the drainage facilities shall be cleaned as specified in Appendix D of the King County Surface Water Design Manual.
(Ord. 518 § 1, 2008; Ord. 395 § 3, 2003).