GRAYWATER STANDARD PLAN For Simple Residential System

Transcription

1 (Based on 203 California Plumbing Code Chapter 6) Project Address: Permit Number: Scope: This Plan applies only to simple residential systems meeting all the following criteria: Graywater discharge is 250 gallons or less per day; The system does not include pumps to distribute graywater; The system is not connected to any source of potable water or other irrigation systems; and Graywater is immediately discharged into the irrigation field without being stored Designer information: Name: Phone Number: ( ) - Address: City: State: Zip Homeowner License # Contractor License type: License # License Type: Engineer/ Architect Checklist Check if provided Item Provide a site plan Show the location of the graywater system on the site plan Show the setback distances of graywater irrigation system per Table 602.4, Page 8 Provide a piping riser diagram Provide manufacturer s literature for valves and pipes used Graywater is not connected to any potable water 3-way diverter valve is clearly labeled to indicate direction of flow Backwater valve is installed on sewer side of 3-way valve in the horizontal position Drainage piping is sized per current California Plumbing Code (CPC) table for maximum unit loading and maximum length of drainage and vent piping. (The drainage piping per 203 CPC Table is included in this document as a sample. For pipe sizing, please refer to current CPC). Irrigation field sizes are shown on site plan and meet minimum requirements Graywater discharge is minimum of 2 below surface or have 2 minimum mulch cover Graywater is not irrigating edible portion of plants (i.e. no root crops) Groundwater depth is below 3ft. and was checked with a test hole Piping material is indicated on the site plan and on the riser diagram Comments (if any) Page of 0

2 . Daily Graywater Flow Calculation a. Number of bedrooms: b. Number of occupants ( + number of bedrooms): c. Type of fixtures connected to graywater system (check all that apply) Lavatory (bathroom sink) Shower /bath Washing machine/washbasin d. Daily Graywater flow: gallons per day. (shall not exceed 250 gallons) Estimate Graywater flow per occupant: Any combination of lavatory, shower or bath: 25 gallons per day per occupant Laundry (washing machine or washbasin): 5 gallons/ day per occupant Daily graywater flow example: (4 occupants x 25 gals/day) + (4 occupants x 5 gals/day) = 60 Gallons per day. 2. Soil Type (Table on page 0): The required set back from slope over 30% is 5 feet Laboratory soil test is allowed on flat sites or sites with moderate slopes, less than 30%. Written verification of the soil type, from a Professional Civil Engineer, is required for designs involving the following soil types: fine sand, course sand or gravel, and if the slopes are over 30%. 3. Size of irrigation field a. Minimum required irrigation field size: square feet Minimum irrigation field size: Divide total gallons per day (from step d) by the maximum absorption capacity of the soil (step 3). Example: 60 gallon/day of graywater in fine sand soil would need 60/4.0 = 40 square feet of irrigation area b. Actual irrigation field size provided: square feet Notes:. Pipe shall be labeled NON-POTABLE WATER, DO NOT DRINK per Department of Public Health (DPH) guidelines. 2. All valves shall be readily accessible. 3. Installation does not violate other codes or damage the building. Any penetration in the building envelope shall be properly sealed. 4. Only pipes approved for waste shall be used in the plumbing drainage system. 5. Upgrades made to plumbing shall be permitted, and shall comply with the Plumbing Code. Page 2 of 0

3 r PLOT OR SITE PLAN Indicate where on the property the graywater will be used (see sample site plans on page 6). Indicate setbacks to property lines, house and other structures. Indicate piping material. Show street frontage. Page 3 of 0

4 PIPING RISER DIAGRAM FOR GRAYWATER SYSTEM Show fixtures draining to the graywater system including waste & vent piping and valves. Indicate piping material. See sample drawing on page 8. Page 4 of 0

5 Detail : Typical detail for irrigation field Page 5 of 0

6 GRAYWATER STANDARD PLAN Sample Plot Plan This drawing is for reference only Page 6 of 0

7 Location of Gray Water System Table (203 California Plumbing Code) Minimum Horizontal Distance in Clear Required From Surge Tank (feet) Subsurface and Subsoil Irrigation Field and Mulch Basin (feet) Disposal Field (feet) Building structures 5 2,3,9 2 3,8 5 Property line adjoining private property Water supply wells Streams and lakes , Sewage pits or cesspools Sewage disposal field Septic tank On-site domestic water service line Pressurized public water main For SI units: foot = mm Notes: Building structures do not include porches and steps, whether covered or uncovered, breezeways, roofed carports, roofed porte cochers, roofed patios, carports, covered walks, covered driveways, and similar structures or appurtenances. The distance shall be permitted to be reduced to 0 feet for aboveground tanks where first approved by the Authority Having Jurisdiction. Underground tanks shall not be located within a 45 degree angle from the bottom of the foundation, or they shall be designed to address the surcharge imposed by the structure. The distance may be reduced to six (6) inches (53 mm) for aboveground tanks when first approved by the Enforcing Agency. Where special hazards are involved, the distance required shall be increased as directed by the Authority Having Jurisdiction. These minimum clear horizontal distances shall apply between the irrigation or disposal field and the ocean mean higher tide line. Add 2 feet (60 mm) for each additional foot of depth in excess of foot (305 mm) below the bottom of the drain line. For parallel construction of for crossings, approval by the Authority Having Jurisdiction shall be required. The distance shall be permitted to be reduced to ½ feet (457 mm) for drip and mulch basin irrigation systems. The distance shall be permitted to be reduced to 0 feet for surge tanks of 75 gallons (284 L) or less. The minimum horizontal distance may be reduced to 50 feet (5 240 mm) for irrigation or disposal fields utilizing graywater which has been filtered prior to entering the distribution piping. Page 7 of 0

8 Sample piping rise diagram for graywater system This drawing is for reference only Page 8 of 0

9 Design of Six Typical Soils Table (203 California Plumbing Code) Type of Soil Minimum Square Feet of Irrigation/Leaching Area Per 00 Gallons of Estimated Gray Water Discharge Per Day Maximum Absorption Capacity in Gallons Per Square Foot of Irrigation Area Per Day (Column 3) Course sand or gravel Fine sand Sandy loam Sandy clay 60.7 Clay with considerable sand or 90. gravel Clay with small amounts of sand or gravel TABLE (203 California Plumbing Code) MAXIMUM UNIT LOADING AND MAXIMUM LENGTH OF DRAINAGE AND VENT PIPING SIZE OF PIPE, inches (mm) ¼ (32) ½ (40) 2 (50) 2 ½ (65) 3 (80) 4 (00) 5 (25) 6 (50) 8 (200) 0 (250) 2 (300) Maximum Units Drainage piping Vertical Horizontal Maximum Length Drainage Piping Vertical, feet (m) Horizontal (unlimited) Vent Piping Horizontal and Vertical Maximum Units Maximum Lengths, ft. (m) (20) (26) (45) (65) (9) (9) (55) (228) For SI units: inch = 25 mm, foot = mm Notes: Excluding trap arm. 2 Except sinks, urinals, and dishwashers - exceeding one () fixture unit. Page 9 of 0

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11 (Based on 203 California Plumbing Code Chapter 6) Project Address: Permit Number: Scope: This Plan applies only to simple residential systems meeting all the following criteria: Graywater discharge is 250 gallons or less per day; The system does not include pumps to distribute graywater; The system is not connected to any source of potable water or other irrigation systems; and Graywater is immediately discharged into the irrigation field without being stored Designer information: Name: Phone Number: ( ) - Address: City: State: Zip Homeowner License # Contractor License type: License # License Type: Engineer/ Architect Checklist Check if provided Item Provide a site plan Show the location of the graywater system on the site plan Show the setback distances of graywater irrigation system per Table 602.4, Page 8 Provide a piping riser diagram Provide manufacturer s literature for valves and pipes used Graywater is not connected to any potable water 3-way diverter valve is clearly labeled to indicate direction of flow Backwater valve is installed on sewer side of 3-way valve in the horizontal position Drainage piping is sized per current California Plumbing Code (CPC) table for maximum unit loading and maximum length of drainage and vent piping. (The drainage piping per 203 CPC Table is included in this document as a sample. For pipe sizing, please refer to current CPC). Irrigation field sizes are shown on site plan and meet minimum requirements Graywater discharge is minimum of 2 below surface or have 2 minimum mulch cover Graywater is not irrigating edible portion of plants (i.e. no root crops) Groundwater depth is below 3ft. and was checked with a test hole Piping material is indicated on the site plan and on the riser diagram Comments (if any) Page of 0

12 . Daily Graywater Flow Calculation a. Number of bedrooms: b. Number of occupants ( + number of bedrooms): c. Type of fixtures connected to graywater system (check all that apply) Lavatory (bathroom sink) Shower /bath Washing machine/washbasin d. Daily Graywater flow: gallons per day. (shall not exceed 250 gallons) Estimate Graywater flow per occupant: Any combination of lavatory, shower or bath: 25 gallons per day per occupant Laundry (washing machine or washbasin): 5 gallons/ day per occupant Daily graywater flow example: (4 occupants x 25 gals/day) + (4 occupants x 5 gals/day) = 60 Gallons per day. 2. Soil Type (Table on page 0): The required set back from slope over 30% is 5 feet Laboratory soil test is allowed on flat sites or sites with moderate slopes, less than 30%. Written verification of the soil type, from a Professional Civil Engineer, is required for designs involving the following soil types: fine sand, course sand or gravel, and if the slopes are over 30%. 3. Size of irrigation field a. Minimum required irrigation field size: square feet Minimum irrigation field size: Divide total gallons per day (from step d) by the maximum absorption capacity of the soil (step 3). Example: 60 gallon/day of graywater in fine sand soil would need 60/4.0 = 40 square feet of irrigation area b. Actual irrigation field size provided: square feet Notes:. Pipe shall be labeled NON-POTABLE WATER, DO NOT DRINK per Department of Public Health (DPH) guidelines. 2. All valves shall be readily accessible. 3. Installation does not violate other codes or damage the building. Any penetration in the building envelope shall be properly sealed. 4. Only pipes approved for waste shall be used in the plumbing drainage system. 5. Upgrades made to plumbing shall be permitted, and shall comply with the Plumbing Code. Page 2 of 0

13 r PLOT OR SITE PLAN Indicate where on the property the graywater will be used (see sample site plans on page 6). Indicate setbacks to property lines, house and other structures. Indicate piping material. Show street frontage. Page 3 of 0

14 PIPING RISER DIAGRAM FOR GRAYWATER SYSTEM Show fixtures draining to the graywater system including waste & vent piping and valves. Indicate piping material. See sample drawing on page 8. Page 4 of 0

15 Detail : Typical detail for irrigation field Page 5 of 0

16 GRAYWATER STANDARD PLAN Sample Plot Plan This drawing is for reference only Page 6 of 0

17 Location of Gray Water System Table (203 California Plumbing Code) Minimum Horizontal Distance in Clear Required From Surge Tank (feet) Subsurface and Subsoil Irrigation Field and Mulch Basin (feet) Disposal Field (feet) Building structures 5 2,3,9 2 3,8 5 Property line adjoining private property Water supply wells Streams and lakes , Sewage pits or cesspools Sewage disposal field Septic tank On-site domestic water service line Pressurized public water main For SI units: foot = mm Notes: Building structures do not include porches and steps, whether covered or uncovered, breezeways, roofed carports, roofed porte cochers, roofed patios, carports, covered walks, covered driveways, and similar structures or appurtenances. The distance shall be permitted to be reduced to 0 feet for aboveground tanks where first approved by the Authority Having Jurisdiction. Underground tanks shall not be located within a 45 degree angle from the bottom of the foundation, or they shall be designed to address the surcharge imposed by the structure. The distance may be reduced to six (6) inches (53 mm) for aboveground tanks when first approved by the Enforcing Agency. Where special hazards are involved, the distance required shall be increased as directed by the Authority Having Jurisdiction. These minimum clear horizontal distances shall apply between the irrigation or disposal field and the ocean mean higher tide line. Add 2 feet (60 mm) for each additional foot of depth in excess of foot (305 mm) below the bottom of the drain line. For parallel construction of for crossings, approval by the Authority Having Jurisdiction shall be required. The distance shall be permitted to be reduced to ½ feet (457 mm) for drip and mulch basin irrigation systems. The distance shall be permitted to be reduced to 0 feet for surge tanks of 75 gallons (284 L) or less. The minimum horizontal distance may be reduced to 50 feet (5 240 mm) for irrigation or disposal fields utilizing graywater which has been filtered prior to entering the distribution piping. Page 7 of 0

18 Sample piping rise diagram for graywater system This drawing is for reference only Page 8 of 0

19 Design of Six Typical Soils Table (203 California Plumbing Code) Type of Soil Minimum Square Feet of Irrigation/Leaching Area Per 00 Gallons of Estimated Gray Water Discharge Per Day Maximum Absorption Capacity in Gallons Per Square Foot of Irrigation Area Per Day (Column 3) Course sand or gravel Fine sand Sandy loam Sandy clay 60.7 Clay with considerable sand or 90. gravel Clay with small amounts of sand or gravel TABLE (203 California Plumbing Code) MAXIMUM UNIT LOADING AND MAXIMUM LENGTH OF DRAINAGE AND VENT PIPING SIZE OF PIPE, inches (mm) ¼ (32) ½ (40) 2 (50) 2 ½ (65) 3 (80) 4 (00) 5 (25) 6 (50) 8 (200) 0 (250) 2 (300) Maximum Units Drainage piping Vertical Horizontal Maximum Length Drainage Piping Vertical, feet (m) Horizontal (unlimited) Vent Piping Horizontal and Vertical Maximum Units Maximum Lengths, ft. (m) (20) (26) (45) (65) (9) (9) (55) (228) For SI units: inch = 25 mm, foot = mm Notes: Excluding trap arm. 2 Except sinks, urinals, and dishwashers - exceeding one () fixture unit. Page 9 of 0

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