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PUBLIC 1':ORKS PROCEDURE. . <br /> STORM DRAINAGE CREDITS <br /> • r March 27, 1984 <br /> BACKGROUND <br /> In January of 1984, the Roseville Council adopted a- storm drainage utility, together. . , <br /> with city policy allowing for adjustments or .credits to storm drainage. fees. The <br /> following procedure shall be used to calculate these credits to assure consistant <br /> application to all situ ations . <br /> CREDITS <br /> A. LAND USE INTENNSITY CREDITS <br /> 1. Criteria: When unit runoff generated by a parcel differs from the. assigr <br /> amount by more than 200, parcel drainage fee is to be adjusted to reflect <br /> actual runoff. <br /> 2. Required information by applicant: <br /> a) Complete site plan. <br /> b) Site area and percentage of "improved" surface. <br /> 3. Calculate Procedure: <br /> a) Calculate unit runoff by SCSS method; using actual percent improve <br /> surface, 2" rainfall , Soil Group "B", Anticedent Moistuxe Con Ltio: <br /> b) Col-Dare with "Standard" Unit Runoff, <br /> • Land Use "Standard" -2" Runoff <br /> Single family ,24" <br /> Cemeteries .& golf courses .09" <br /> Develooed parks . 18" <br /> Schools $ com-munity centers .30" <br /> Multiple F, churches .56" <br /> Commercial/industrial 1.24" <br /> • c) If calculated unit runoff differs from standard by 200 or more, ad <br /> just parcels REU value by ratio of actual unit runoff to standard <br /> unit runoff. <br /> 4. Exceptions : <br /> a) No adJustments to single family parcels, as their fees do not depe <br /> on lot size or intensity. <br /> b) For parcels with drainage easements, reduce parcel size to non-eas <br /> nent area, then calculate unit runoff. <br /> B. Rate of Discharge Credits <br /> 1.' Criteria-- ',,lien peak runoff from site i.s limited to pre-development leve <br /> by on-site facilities owned and r-iaintained by property owner, uo to 25; <br /> .reduction in draina-e tee can be granted. <br /> 2. Required information b}• applicant : <br /> a) Co: nL" site nlnn . <br /> • b) Area Of site draining to each outlot point . <br /> C) ,. i:proved stir--ace dra:Illi17, to each outlet Olnt , <br /> d) Specific details about outlet ':acilit} (s; . <br /> e) Calculation of peak outflow rate for 5-year and 100-year design ra <br /> fall , using modiCied rational :-et`lod with tc of 30 min. or more. <br />