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HomeMy WebLinkAbout04072022 BSC Agenda Item 2 STAFF REPORT Business of the Building and Standards Commission City of West University Place, Texas AGENDA OF: 04.07.22 DATE SUBMITTED: 04.07.22 DEPARTMENT OF ORIGIN: Development Services PREPARED BY: Alfonso Acosta PRESENTER: Alfonso, Acosta, City Building Official SUBJECT: Review, discuss and possible action to recommend adoption by City Council of minimum standards for drainage regulations and STAFF PRESENTER: Alfonso Acosta, City Building development standards to align with Harris Official County. STAFF SUMMARY Review,discussion and possible action to recommend the following standards for adoption by City Council for minimum set of drainage regulations and development standards to align with Harris County • Use of Atlas rainfall rates for sizing storm water conveyances and detention systems (Ch. 18, 74) Example: At no time shall the first level finished floor elevation or the bottom of the lowest horizontal structural member of a pier and beam building be less than the hydraulic grade line as modeled and profiled for the city's major drainage ways based on the Harris County NOAA Atlas 14 required storm event as adopted by Harris County in 2020. • Require a minimum detention rate of 0.55 acre feet per acre detention for any new development on tracts one acre or larger(Ch. 18, 74) West U's current standard: Sec. 18-56. - Site drainage; drainage plans. (a)Basic drainage requirements. For each impact area (see definition in subsection (b)), the permittee must prepare a drainage plan and obtain the approval of the building official,as required by this section. Exception:No drainage plan is required for a project if the building official issues a "low impact" certification after determining that the project will probably have no drainage impact, or very low impact, upon neighboring property. In addition, each permittee, each successive owner and each successive person in control of an impact area has a continuing duty to: (1)Provide basic site drainage (see definition below) at all times, unless otherwise specified in an approved drainage plan or an approved amendment; and (2)Comply with the approved drainage plan(if the plan was required by this Code or any prior city ordinance) or an approved amendment at all times. (b)Definitions. In this section, the following terms have the meanings shown, unless the context clearly indicates a different meaning: (1)Basic site drainage means drainage that: a.Captures substantially all of the rainwater that would fall onto the impact area, assuming a rainfall of one inch in one hour; and b.Causes that rainwater to be absorbed within the same building site or conveyed to a lawful receiving place for rainwater,without escaping onto any other site and without washing detectable quantities of soil or debris off the building site. Rainwater may be conveyed across another site, if properly authorized by perpetual, recorded easement or a similar interest in the land. (2)Impact area means the area where grade-raising,major development or creation of green space occurs (or occurred after July 7, 1991). In the case of major development or creation of green space,the entire building site is included in the impact area. (c)Drainage plans; content, types, etc. The applicant must prepare each drainage plan in two versions: "as designed" and "as built." The requirements are as follows: "As Designed" Version (1) A topographic survey drawing (with sufficient "spot" elevations and flow directions, as determined by the building official) showing— —the impact area and the receiving points for runoff, "as-is," before work on the site begins —established drainage patterns across property lines (2) Clear drawings and descriptions of temporary and permanent drainage measures "as designed" that— —provide basic site drainage but in no case shall more than six inches above existing grade of fill be allowed. However,the building official may authorize additional fill above the six-inch limit if the building official determines additional fill is necessary for proper drainage —minimize the amount of fill and tree damage —provides drainage away from building foundations as required by applicable regulations —mitigate significant interference with established drainage patterns across property lines toward the impact area(up to the capacity of a four-inch drain pipe-or its equivalent—from the rear of the site to the street) —provides for basic stormwater quality protection as may be required by applicable regulations (3) A written certification, signed and sealed by the permittee that the "as-designed" drainage measures will meet the requirements set out above (4) Additional information requested by the building official "As built" Version (1) Clear drawings and descriptions of permanent drainage measures "as built" that- -substantially conform to the "as-designed" version of the drainage plan, including the topographic survey data —provide basic site drainage but in no case shall more than six inches above existing grade of fill be allowed unless authorized by the building official in the "as designed"plans —minimize the amount of fill and tree damage —provide drainage away from building foundations as required by applicable regulations —mitigate significant interference with established drainage patterns across property lines toward the impact area(up to the capacity of a four-inch drain pipe-or its equivalent—from the rear of the site to the street) —provides for basic stormwater quality protection as may be required by applicable regulations (2) A written certification that the "as-built" drainage measures meet the requirements set out above, signed by the permittee (3) Additional information requested by the building official (d)Drainage plans; preparation, etc.(1)Preparation and processing, "as designed" plans: a.The "as designed" version of the drainage plan must be filed with the building official before issuance of the initial permit for the project. As provided by this Code,the drainage plan may be submitted as a component of a site plan.b.The building official shall approve the "as designed" plan, unless the building official notices some non-compliance with this section or other applicable regulations. c.No permit may be issued until the "as designed" site plan is approved. (2)Preparation and processing, "as built" plans: a.Each permittee must deliver the "as built" version of the drainage plan to the building official by the sooner of:l.The 30th day following completion of the project (including final ground cover and landscaping); or2.The 30th day following the expiration of the permit. As provided by this Code, the drainage plan may be submitted as a component of a site plan. b.The building official shall review and approve the "as built" plan, unless the building official notices some non-compliance with this section or other applicable regulations. c.Any fee charged by the city for reviewing the "as built" drainage plan may be waived if the building official determines that the "as built" plan is not substantially different from the approved "as designed" plan and can be readily compared. d.No final occupancy permit or similar approval (except a temporary certificate of occupancy) may be issued until the "as built" drainage plan is approved. (3)Amendments.Amendments to drainage plans are handled in the same manner as original plans. Exception:No amended drainage plan is required for a project if the building official issues a"low impact" certification after determining that the project will probably have no drainage impact, or very low impact, upon neighboring property.(e)Drainage plans; implementation. Either temporary or permanent measures to achieve basic site drainage must be put into effect before grade-raising work or major development starts. Any temporary measures must remain in effect until permanent measures are installed and are operating as designed. Temporary measures may incorporate all or part of the permanent measures. Permanent measures must be installed and operating as designed as soon as practicable after grade-raising work or major development is completed.(f)Other rights and duties . Some persons may have state-created or recognized rights and duties with respect to surface water and drainage. For example, under state water laws, a property owner may have the right to allow water to drain naturally onto neighboring property,and the owner of the neighboring property may have the duty to receive the water. Neither this Code nor any actions taken by city officials shall ever be interpreted to diminish any other rights or duties arising under state water laws.Any person receiving a city permit or other approval remains obligated to carry out all state- created duties and to respect all state-created rights,whether compelled to do so by the city,or not. Every property owner remains free to pursue all state-created rights and remedies against other property owners, and it is neither required nor appropriate to involve the city in any such proceeding. • Prohibit the use of hydrograph timing as a substitution for detention on any project (Ch. 18, 74) See above. • Require no net fill in 500-year floodplain (Ch. 18) Current: 18-275 (provisions for flood hazard reduction)(a) (8)All new construction or substantial improvements to be constructed on fill located in the 100-year floodplain shall be constructed on properly designed and compacted fill that has appropriate protection from erosion and scour; • Require minimum Finished Floor Elevation (FFE) of new habitable structures be established at or waterproofed to the 500-year floodplain elevation (Ch. 18) Current: 18-275(a)(4)All new construction or substantial improvements shall be constructed with electrical, heating, ventilation, plumbing, and air conditioning equipment and other service facilities that are designed and/or located two feet above base flood elevation so as to prevent water from entering or accumulating within the components during conditions of flooding; and (d)(1)Residential construction. new construction and substantial improvement of any residential structure shall have the lowest floor (including basement), elevated to two feet above the base flood elevation. A registered professional engineer, architect, or land surveyor shall submit a certification to the floodplain administrator that the standard of this subsection as proposed in subsection 18-274(c)(1)a., is satisfied.(2)Nonresidential construction. new construction and substantial improvements of any commercial, industrial or other nonresidential structure shall either have the lowest floor (including basement) elevated to two feet above the base flood level or together with attendant utility and sanitary facilities, be designed so that below the base flood level plus two feet the structure is watertight with walls substantially impermeable to the passage of water and with structural components having the capability of resisting hydrostatic and hydrodynamic loads and effects of buoyancy. A registered professional engineer or architect shall develop and/or review structural design, specifications, and plans for the construction, and shall certify that the design and methods of construction are in accordance with accepted standards of practice as outlined in this subsection. A record of such certification which includes the specific elevation (in relation to mean sea level) to which such structures are floodproofed shall be maintained by the floodplain administrator. • Presentation by Mr. Jon Steiber,P.E., CFM—Director-General Services Division, Harris County HARRIS COUNTY OFFICE OF THE COUNTY ENGINEER 1001 Preston, Suite 500 Houston, Texas 77002 (713) 755-5370 MEMORANDUM DATE: July 9, 2020 TO: File FROM: John R. Blount, P. County Engineer CC: Russell A. Poppe, P.E. Executive Director, Harris County Flood Control District SUBJECT: Coastal and Stillwater Floodplain Clarification - May 19, 2020 Commissioners Court Action Concerning Requirement Minimum Standards for Communities in Harris County and Draining to Harris County On May 19, 2020, Harris County Commissioners Court recommended that all cities within Harris County and those entities outside of Harris County that drain to Harris County adopt five minimum standards in their drainage and/or floodplain regulations prior to December 31, 2020 in order to continue participating in partnership projects with Harris County. The intent of the initiative is to ensure that minimum flood protection measures are in place that take into consideration the changes brought about by the new understanding of rainfall rates in the NOAA Atlas 14 study so as to create a more resilient community. However, Atlas 14 rainfall changes do not significantly impact flood risk in coastal and stillwater areas. Therefore, the following clarification shall be made to the approved Court letter as it applies to coastal and stillwater areas as defined below: 1. Minimum Measure #1: Use Atlas 14 rainfall rates for sizing storm water conveyance and detention systems: Atlas 14 shall be required to size localized storm water conveyance systems, such as storm sewers and roadside ditches, and size detention systems that outfall into the localized storm water conveyance systems. Atlas 14 rainfall shall not be a minimum requirement for detention for developments that directly outfall into a stream or body of water impacted by coastal flooding (i.e. tidal impacts, Stillwater elevation, storm surge). c:\users\edeleon\appdata\local\microsoft\windows\inetcache\content.outlook\whggY5 36\coastal and stillwater clarification.doc HARRIS COUNTY OFFICE OF THE COUNTY ENGINEER 1001 Preston, Suite 500 Houston, Texas 77002 (713) 755-5370 2. Minimum Measure #2: Require a minimum detention rate of 0.55 acre feet per acre detention for any new development on tracts one acre or larger. However, a single family residential structure and accessory buildings proposed on an existing lot is exempt from providing detention. This minimum measure shall be applied to all areas that require detention based on the clarification Minimum Measure #1. If an area is exempt from providing detention based on Minimum Measure#1, this measure does not apply. 3. Minimum Measure #3: Prohibit the use of hydrograph timing as a substitution for detention on any project, unless it directly outfalls into Galveston Bay. The measure shall not apply for any developments that directly outfall into a stream or body of water impacted by coastal flooding (i.e. tidal impacts, Stillwater elevation, storm surge). 4. Minimum Measure #4: Require no net fill in the current mapped 500-year floodplain, except in areas identified as coastal zones only. As this requirement clearly states, this should not be required in coastal areas. It also makes sense that this requirement should not be required in stillwater areas as well. 5. Minimum Measure #5: Require the minimum Finished Floor Elevation (FFE) of new habitable structures be established at or waterproofed to the 500-year floodplain elevation as shown on the effective Flood Insurance Study. The Flood Insurance Study does not show a 500-year elevation for coastal areas, hence coastal areas are exempt from this requirement. However, stillwater areas show a 500-year floodplain that is not based on riverine conditions but rather based surge and wave action. Therefore, stillwater areas shall also be exempted from this requirement. Rather, local governments shall be required, at a minimum, to meet FEMA requirements for FFEs in these zones. Further background and information to determine if a floodplain is coastal or stillwater is as follows: Coastal communities face a range of flooding hazards that include storm surge, waves, and erosion. Elevated water levels at the coast is a main reason for coastal flooding. Elevated water levels allow floodwaters and waves to travel further inland than they would otherwise. The elevated water level observed during a flood event is typically called the Stillwater Elevation (SWEL). The SWEL tells us how high floodwaters could rise during a flood event due to storm surge, tides, wave setup, or other factors that cause increases in water levels. This elevation does not include the additional heights of the waves. c:\users\edeleon\appdata\local\microsoft\windows\inetcache\content.outlook\whggY5 36\coastal and stillwater clarification.doc HARRIS COUNTY OFFICE OF THE COUNTY ENGINEER 1001 Preston, Suite 500 Houston, Texas 77002 (713) 755-5370 The coastal SFHA is where the source of flooding consists of coastal hazards such as storm surge and waves. On the FIRM, the coastal SFHA is designated by Zones VE, AE, and AO. Each flood zone area is bounded by a solid white boundary line and is assigned a single, typically whole-foot, BFE. Coastal BFEs apply to the entire area between the white boundary lines. Coastal BFEs are shown as values in parentheses under the zone labels...i.e. if the BFE were 10 feet, the BFE label would read (EL 10) under a VE or AE designation. The Limit of Coastal Floodplain is marked on a flood map with a white line to show the location where, for BFEs, flooding from riverine flood sources becomes greater than flooding from coastal flood sources. Typically, on the coastal side of the line, static, whole-foot BFEs are shown while on the riverine side of the line, BFEs are marked at cross sections and BFE lines. The below example shows an area containing a Coastal Zone AE with whole-foot BFEs. For Zone AE flood zones within a coastal community, it indicates areas that have at least a 1-percent-annual-chance of being flooded, but where wave heights are less than 3 feet. On the flood map, Zone X (shaded) areas are shown with a light orange color. While no flood elevations will be shown on the flood map for this zone, information about the 0.2-percent-annual-chance SWELs and wave hazards may be found in the FIS report for coastal areas (which would be labeled on the flood profiles). It should be noted that the Zone X (shaded) areas determined by coastal flooding are not associated with riverine flooding or stream modeling. These areas should be considered separately when applying Harris County Minimum Standards, since these elevations are not determined by riverine modeling. 50, „,, .' ?t.'s�/ rY, - y 10, Af to ...�✓` The source used to obtain the information provided above is from the Federal Emergency Management Agency (FEMA) document, "An Introduction to FEMA Coastal Floodplain Mapping." c:\users\edeleon\appdata\1oca1\microsoft\windows\inetcache\content.outlook\whggY5 36\coastal and stillwater clarification.doc HARRIS COUNTY OFFICE OF THE COUNTY ENGINEER 1001 Preston, Suite 500 Houston, Texas 77002 (713) 755-5370 c:\users\edeleon\appdata\local\microsoft\windows\inetcache\content.outlook\whggY5 36\coastal and stillwater clarification.doc y _ '@�tk V. 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