DDW-2024-009534

Irrigation Demands & Map
Additional Notes
Capacity Calculations
Does the water system provide fire protection?
System Name:
gpm
Zone
Peak Day
Avg Year
Storage
Demand
Reqmt
Peak
Total
Instantaneous
Water Rights
Storage
(gpm)
(ac-ft/yr)
(gallons)
Requirement
Source
zone
Difference:
gal
(gpm/irr. ac)
Avg. Yr.
(ac-ft/yr
per irr. ac.)
(gal/irr. ac)
IRRIGATION DEMANDS
(to be added to indoor and fire flow demands)
Is the drinking water used for outdoor irrigation?
- - - - - - - - -
- - - - - - - -
- - - > > >
(gpd/ERC)
Required Fire Suppression Storage (gallons)
Irrigation zone
(gallons/ERC)
Modern Recreation Camp
GPD/person
Semi-Developed Camp w/ flush toilets
System Number:
Existing Sources:
Existing Storage:
Irrigation Demands & ERCs
(used in calculations on DDW Calculation sheet)
Total Source Capacity
(in gallons)
Total Storage Capacity
(in gallons per minute)
1. Indoor Water Use
2. Outdoor Water Use
3. Fire Flow Requirement
Does this system have adequate storage capacity per R309-510-8?
Required Source Capacity:
Required Storage Capacity:
Per ERC
Total Equivalent Residential Connections (ERCs)

Does this system have adequate source capacity per R309-510-7?
% of Req'd Capacity:
ERCs
ERCs
ERCs of other connections

Residential ERCs using drinking water for irrigation
Percentage of Residential ERCs using DW for irrigation
Enter the green cells only.
Number of residential connections
(Enter notes here. Check whether and what % of outdoor irrigation is supplied by drinking water.)
Number of other connections - - -
Max. ERC allowed (for indoor use only)
(Enter notes here if needed.)
Total Water System Requirements (= indoor use + outdoor use + fire flow demand)
MINIMUM REQUIREMENTS FOR INDOOR WATER USE
MINIMUM REQUIREMENTS FOR OUTDOOR WATER USE
MINIMUM REQUIREMENTS FOR WATER SYSTEM
MINIMUM REQUIREMENTS FOR INDOOR USE
Semi-Developed Camp w/o flush toilets
Roadway Rest Stop w/ flushometer valves
RV Park
N/A
ERC/site or pad
Gallon/site or pad
# of Sites or pads
Facility Type
ERC/1000 vehicles served
# of Vehicles served
Source (GPD/vehicle)
*Number of people per camp site
GPD/person*
Storage (Gal./vehicle)
(Use this additional sheet to document calculations related to the DDW Calculation sheet, such as ERCs.)
(Enter additional notes here.)
Additional Notes
Map Zones
Maximum fire suppression demand for water system or pressure zone (gpm)
Maximum fire suppression duration for water system or pressure zone (hours)
- - - - - - - - - - -
- - - - - - - - - -
Calculated GPD/site or pad
Total Projected Number of ERCs
Existing Residential Connections
Number of Obligated Future ERCs
Total irrigated acreage of other connections.
Average irrigated acreage per residential connection
(Example: water use of 2 factory is equivalent to 75 homes.)
Calcuation of Projected ERCs
(Enter notes here. Verify minimum fire flow and duration with local fire authority.)
IPS points may be assessed for lacking required storage capacity.
IPS points may be assessed for lacking required source capacity to meet peak day and/or average yearly flow requirements.
Division of Drinking Water Water System Capacity Calculation Sheet (revised February 21, 2012)
Non-community Water Systems - Calculation of ERCs for Indoor Water Use (*See R309-510, Tables 510-1, 2, & 4 for other facility types.)
WS001
vacant lots
WELL
SAND ISLAND RECREATION
19071
ST001

August 2003 - DDW Revision
SAND ISLAND RECREATION
19071
2.00
2.80
1.00
2.00
3.00
4.00
5.00
6.00
NO ZONE
1.23
1.00
2.00
3.00
4.00
5.00
6.00
NO ZONE
1873.00
1.00
2.00
3.00
4.00
5.00
6.00
NO ZONE
1.00
2.26
1.17
1782.00
4.52
2.00
2.80
1.23
1873.00
5.60
3.00
3.39
1.66
2528.00
6.78
4.00
3.96
1.87
2848.00
7.92
5.00
4.52
2.68
4081.00
9.04
6.00
4.90
3.26
4964.00
9.80

SAND ISLAND RECREATION

19071
Page of
1.00
1.00
0.60
1.60
800.00
0.89
24.00
60.00
400.00
640.00
0.45
0.72
0.00
0.00
0.00
1.00
0.00
2.00
2.00
3.00
4.00
5.00
6.00
0.00
24.00
60.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
60.00
800.00
0.89
400.00
640.00
0.45
0.72
10.00
0.89
11.25
9.11
5000.00
640.00
7.81
4360.00
60.00
300.00
30.00
2.00
150.00
0.38
800.00
0.00
0.00

20.00
100.00
10.00
2.00
50.00
0.13
800.00
5.00
0.63
5.00
25.00
2.50
2.00
12.50
0.03
800.00
0.00
0.00
100.00
50.00
0.13
800.00
0.00
0.00
5.00
7.00
3.50
2.00
8.75
1000.00
800.00
0.00
0.00
1000.00
SAND ISLAND RECREATION
0.75
10.00
0.00
0.00
10.00
18.00
800.00
1440.00
5000.00
0.75
5000.00
Yes
No
Yes
No
Enter number of non-residential connections (e.g., 2 factory connections).
Convert "Number of other connections" (Cell E9) to ERCs here. [ERCs of other connections = peak day demand of other connections / 800 gal per day]
Enter estimated irrigated acre per residential lot here.
Enter total irrigated acres of other connections here.

Enter fire flow in gpm.
Enter duration in hours.
Linked to Cell I99 below.
Select Irrigated Zone # from the list. See "Irrigation Demands & Map" tab on the bottom of the screen.
Linked to Cell I118 below.

If applicable, enter number of people per camp site here.
Negative number means (1) additional source capacity is needed , and (2) IPS points should be assessed.
Negative number means (1) additional storage volume is needed, and (2) IPS points should be assessed.
If you need to calculate projected future demand & req'ts (including both existing & future residential connections), enter this number to Cell I8 as "Number of residential connection."

Diaphragm or air pressure tanks shall not be considered effective storage volume for community systems or NTNC with significant demand.
Linked to Cell C51 above.
Linked to Cell E51 above.