Florida Administrative Code › 62 - DEPARTMENT OF ENVIRONMENTAL PROTECTION › 62 - Departmental › Chapter 62-610 - REUSE OF RECLAIMED WATER AND LAND APPLICATION › Part VIII - PERMITTING › Section 62-610.860 - Limited Wet Weather Discharge

Current through Reg. 50, No. 138; July 16, 2024
(1) The
				  Department encourages implementation of reuse of reclaimed water programs.
				  Demand for reclaimed waters normally declines during wet weather periods.
				  During such wet weather periods, surface water stream flows normally increase.
				  Allowing limited wet weather discharge of excess reclaimed waters during such
				  wet weather periods will facilitate implementation of reuse projects.
				  Therefore, persons implementing reuse projects are authorized to seek approval
				  for limited wet weather discharges as described below.
(2) An applicant requesting a permit for a
				  limited wet weather discharge shall include the following information in the
				  engineering report:
(a) A map showing the
				  locations of the point of discharge and of the proposed receiving
				  stream.
(b) Descriptions and
				  locations of downstream lakes, estuaries, reservoirs, Outstanding Florida
				  Waters, or Class I waters.
(c) An
				  analysis of the historic records for daily rainfall for a period of record
				  covering at least the most recent 20 years, using climatic data that are
				  available from, or are representative of, the area involved. This shall include
				  calculation of the average annual rainfall.
(d) An analysis of the historic records for
				  stream flow in the proposed receiving stream.
(e) Estimates of time of travel from the
				  proposed point of limited wet weather discharge to downstream lakes, estuaries,
				  reservoirs, Outstanding Florida Waters, or Class I waters during periods when
				  limited wet weather discharge would occur.
(f) Analysis of the proposed operation of the
				  reuse, storage, and limited wet weather discharge systems including
				  identification of the proposed operating schedule, frequency of limited wet
				  weather discharge, duration of limited wet weather discharge, quantity of
				  reclaimed water to be discharged, quality of the reclaimed water to be
				  discharged, and the flow in the receiving stream during limited wet weather
				  discharge periods. The analysis shall be conducted for a year from the historic
				  record which had rainfall that was within 10 percent of the average annual
				  rainfall (referred to as "the average rainfall year").
(g) Calculation of the required minimum
				  stream dilution factor as follows:
SDF
=
P(0.085 CBOD5 + 0.272 TKN - 0.484)
Where:
SDF
=
minimum required stream dilution factor
								(dimensionless),
P
=
percent of the days of the year that limited wet
								weather discharge will occur during an average rainfall year (e.g. if discharge
								will occur on 73 days; P = 100% x (73/365) = 20; if P is less than 1, use P =
								1),
CBOD5
=
the treatment facility's design monthly maximum
								limitation for CBOD5 in mg/L,
TKN
=
the treatment facility's design monthly maximum
								limitation for TKN expressed in mg/L of nitrogen.
(h)
				  Documentation required by the antidegradation policy in Rules
				   62-4.242 and
				   62-302.300, F.A.C., if the
				  limited wet weather discharge will be a new or expanded surface water
				  discharge.
(i) If the minimum
				  stream dilution factor calculated in paragraph
				   62-610.860(2)(g),
				  F.A.C., is less than 1.0, the minimum stream dilution factor shall be set equal
				  to 1.0.