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Santa Ana River Channel <br />E01- R1551, R1553 <br />Site Design & Landscape Planning S -10 <br />regulatlullti to discourage the clearing, tilling, and chaunelization of these features. Utilize <br />tllerlt >itl drainage networks in preference to pipes, culverts, arid e:ngitleered flitches. <br />■ EvaluaLing infiltration opportunities by referring to tale stotrnwater management manual For <br />the jurisdiction and pay particular attention [o tI1C selection criteria far avoiding <br />groundwater contarrunation, poor soils, and hydrogeological conditions that cause these <br />facilities to fail. If necessary, locate developments vdth large arltoullts of impervious <br />surfaces or a potential to produce relatively contaminated runoff away' from groundwater <br />re charge areas. <br />PY- Oteetion of 5lnj;cs and Channels during Landscape Des!gn <br />■ ConVev runoff safely from the Lops of slopes. <br />Ave-)id disturbing steep or unstable slopes. <br />■ Avoid disturbing natural channels_ <br />■ Stabilize diStUrbed slopes as quickly as possible. <br />• Vegetate slopes v4ith native or drought tolerant vegetation. <br />• Control and treat flows in landscaping acid /orothercontrols prior to reaching existing <br />natural drainage systems. <br />• Stabilize terllporary and permanent channel crossings as quickly as possible, and ensure that <br />increases ill run -off velocity' and frequenev caused by the project do not erode the channel. <br />• Install energy dissipaters, such as riprap, at the outlets of new storm drains. culverts. <br />C011duits, or cllanneLS that enter unlined channels. irl accordance with applicable <br />sped Flea tiorls to minimize erosion. Energy dissipaters shall be installed in such a Nvay as to <br />tllinittlize impacts to receiving waters. <br />• Line 011 -site conveyance channels where appropriate, to reduce erosion caused by increased <br />flow velocity due to increases in tributary imperious area. The first choice for linings <br />should be grass or some other vegetative surface, since these materials not only reduce <br />runoff volocities, but also larakide water quality, benefits front filtration and infiltration. If <br />velocities ill the channel are high enough to erode grass or other vegetative linings, riprap, <br />concrete. soil cement, or geo -grid stabilization are other alternatives. <br />■ Consider other design principles that are comparable and equally effective.. <br />l2cdc uc Iu�rlrty h.visfiny instulfutions <br />Various jurisdictional storrnlv'ater management and mitigation plans. (SUSNip, VvQ_Njp, etc.} <br />define `redevelopment" in terms of amounts of additional ialpellious area, illercases ul gross <br />floor area and /or exterior construction_ and land disturbing, actiAties Mth structural or <br />impervious surfaces. The definition of - redevelopment" must be. consulted to determine. <br />Whether or not the requirements for new development apply to areas ititended for <br />redevelopment_ If the d.ehrdtion applies, the steps outlined udder "designing new installations' <br />above should be followed. <br />January 2003 California Stol-mvrater BMP Handbook 3 of 4 <br />New Development and Redevelopment <br />%Y\- w.cabmphandbooks.com <br />Edna Park Lease (06.16.09) <br />