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PUBLIC WORKS PROCEDURE <br />STORM DRAINAGE CREDITS <br />March 27, 1984 <br />BACKGROUND <br />In January of 1984, the Roseville Council adopted a storm drainage utility, together with City <br />policy allowing for adjustments or credits to storm drainage fees. The following procedure shall <br />be used to calculate these credits to assure consistent application to all situations. <br />CREDITS <br />A. LAND USE 1NTENSITY CREDITS <br />1. Criteria: When unit runoff generated by a parcel differs from the assigned amount <br />by more than 20%, parcel drainage fee is to be adjusted to reflect 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 improved surface, <br />2" rainfall, Soil Group `B", Antecedent Moisture Condition. <br />b) Compare with "Standard" Unit Runoff. <br />Land Use "Standard" 2" Runoff <br />Single family .24" <br />Cemeteries & golf courses .09" <br />Developed parks .18" <br />Schools & community centers 30" <br />Multiple & churches .56" <br />CommerciaUindustrial 124" <br />c) If calculated unit runoff differs from standard by 20% ar more, adjust parcels <br />REU value by ratio of actual unit runoff to standard unit runoff. <br />4. Exceptions: <br />a) No adjustments to single family parcels, as their fees do not depend on lot size <br />or intensity. <br />b) For parcels with drainage easements, reduce parcel size to non-easement area, <br />then calculate unit runoff. <br />B. RATE OF DISCHARGE CREDITS <br />1. Criteria: When peak runoff from site is limited to pre-development levels by on-site <br />facilities owned and maintained by property owner, up to 25% reduction in drainage <br />fee can be granted. <br />2. Required infarmation by applicant: <br />a) Complete site plan. <br />b) Area of site draining to each outlet point. <br />c) % improved surface draining to each outlet point. <br />7 <br />