Table 365-11 - Classification of Stormwater Hotspots
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The following land uses and activities are samples of stormwater
hotspots:
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•
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Vehicle salvage yards and recycling facilities
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•
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Fleet storage areas (bus, truck, etc.)
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•
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Public works storage areas
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•
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Facilities that generate or store hazardous materials
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Table 365-12, Water Quantity Requirements
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District
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Proposed Conditions
(reduce to)
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Existing Conditions
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A
Subareas: 240-243, 19, 23, and 5
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2-year
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1-year
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5-year
|
5-year
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10-year
|
10-year
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25-year
|
25-year
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50-year
|
50-year
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100-year
|
100-year
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B-1
Subareas: 7-9, and 15
|
2-year
|
1-year
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5-year
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2-year
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10-year
|
5-year
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25-year
|
10-year
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50-year
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25-year
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100-year
|
100-year
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B-2
Subareas: 4, 10, 11 12, 18, 21, 24, 26, 27, 28, 29, 30, 32,
36, 44, 225, 226, B-3
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2-year
|
1-year
|
5-year
|
2-year
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25-year
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5-year
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50-year
|
10-year
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100-year
|
50-year
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50-year
|
10-year
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No subareas in Pocono Township
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100-year
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50-year
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C
Subareas: 39, 55, 57, 56
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Provisional Direct Discharge District — Development sites which can discharge directly to the main channel or major tributaries or indirectly to the main channel through an existing stormwater drainage system (i.e., storm sewer or tributary) which meets the "downstream hydraulic capacity analysis" in § 365-12H and is shown by the design professional to not cause a downstream problem, may allow an increase in flow as long as no downstream harm is demonstrated. However, sites in District C shall comply with the criteria for water quality and stream-bank erosion (§ 365-10); and groundwater recharge (§ 365-11). If the proposed conditions runoff is intended to be conveyed by an existing stormwater drainage system to the main channel, assurance must be provided that such system has adequate capacity to convey the increased peak flows or will be provided with improvements to furnish the required capacity. When adequate capacity of the downstream system does not exist and will not be provided through improvements, the proposed conditions peak rate of runoff must be controlled to the existing conditions peak rate as required in District A provisions (i.e., ten-year proposed conditions flows to ten-year existing conditions flows) for the specified design storms.
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Table 365-13
Acceptable Computation Methodologies for Stormwater Management
Plans
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---|---|---|
Method
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Method Developed by
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Applicability
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TR-20 (or commercial computer package based on TR-20)
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USDA NRCS
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Applicable where use of full hydrology computer model is desirable
or necessary
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TR-55 (or commercial computer package based on TR-55)
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USDA NRCS
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Applicable for land development plans within limitations described
in TR-55
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HEC-1/HEC-HMS
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United States Army Corps of Engineers
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Applicable where use of full hydrologic computer model is desirable
or necessary
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PSRM
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Penn State University
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Applicable where use of a hydrologic computer model is desirable
or necessary; simpler than TR-20 or HEC-1
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Rational Method (or commercial computer package based on Rational
Method)
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Emil Kuichling (1889)
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For sites less than 200 acres, or as approved by the municipality
and/or Municipal Engineer
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Other methods
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Varies
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Other computation methodologies approved by the municipality
and/or Municipal Engineer
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