AMENDED ORDINANCE O-18-015
(3) Measurement of peak discharge rates shall be calculated using point of discharge
or the downgradient property boundary. The topography of the site may require
evaluation at more than one location if flow leaves the property in more than one
direction. An applicant may demonstrate that a feature beyond the property
boundary is more appropriate as a design point.
C. Recharge to groundwater. Annual groundwater recharge rates shall be maintained by
providing infiltration by the use of structural and nonstructural methods. The annual
recharge from post development site conditions shall mimic the annual recharge from
predevelopment site conditions. Best management practice (BMP) techniques to achieve
recharge requirements include infiltration, bioretention, dry swale, and nonstructural
techniques. Alternative techniques may be used if they meet the performance criteria
stated herein and are approved by the Planning Board.
D. Water quality.
(1) For discharges to the Conservation Zone within the Water Supply protection
District as defined in § 190-24, the runoff volume to be treated for water quality if
calculated as 1.0 inch of runoff multiplied by the total impervious area of the post
development project site.
(2) For all other discharges, the runoff volume to be treated for water quality if
calculated as 0.5 inch of runoff multiplied by the total impervious area of the
postdevelopment project site.
(3) Removal of 80% of the suspended solids (TSS), floatables, greases, and oils. For
new developments, stormwater management systems shall be designed to remove
80% of the average annual load of total suspended solids (TSS), floatables,
greases, and oils after the site is developed. This standard is met when:
(a) The Planning Board determines that suitable nonstructural practices for
source control and pollution prevention are implemented;
(b) Stormwater management best management practices (BMPs) capture the
prescribed runoff volume; and
(c) Stormwater management BMPs are maintained as designed.
E. Critical areas land uses with higher potential pollutant loads—Stermawater-discharces from
areas-with hich potential poHutantteads require the use of specific stormwater
management BMPs, as detailed in this section. The use of infiltration practices without
pretreatment is prohibited.
(1) The following uses are considered to create high potential pollutant loads:
