Laserfiche WebLink
Element 3: Control Flow Rates <br /> • Properties and waterways downstream from development sites shall be protected from erosion due to <br /> increases in the volume, velocity, and peak flow rate of stormwater runoff from the project site, as <br /> required by local plan approval authority. <br /> Standard erosion control practices such as silt fencing will be used to protect downstream <br /> properties from temporary construction related increases in volume, velocity and peak flow rates. <br /> Runoff will sheet flow off site through existing vegetated grassed areas. <br /> • Downstream analysis is necessary if changes in flows could impair or alter conveyance systems, <br /> stream banks, bed sediment or aquatic habitat. See 3.6 for offsite analysis. <br /> Flows from this site will not change or alter the conveyance system from this small drainage basin. <br /> • Where necessary to comply with Minimum Requirement #7, Stormwater retention/detention facilities <br /> shall be constructed as one of the first steps in grading. Detention facilities shall be functional prior to <br /> construction of site improvements (e.g. impervious surfaces). <br /> A silt fence and straw mulch are proposed to handle runoff from the proposed new SFR roof as <br /> storm water connection to the existing storm drain line is proposed/necessary with this application. <br /> • The local permitting agency may require pond designs that provide additional or different stormwater <br /> flow control if necessary to address local conditions or to protect properties and waterways downstream <br /> from erosion due to increases in the volume, velocity, and peak flow rate of stormwater runoff from the <br /> project site. <br /> No additional or different stormwater flow control requirements are required with this application. <br /> • If permanent infiltration trenches are used for flow control after construction, these facilities should be <br /> protected from compaction during the construction phase. <br /> Infiltration ponds are not proposed with this application. <br /> Relative BMPs for this Category <br /> BMP C209: Outlet Protection <br /> BMP C235: Wattles <br /> BMP C234: Vegetated Strip <br />