2023-08-30_HYDROLOGY - M2001046

• Permit No: M2001046
• IBM Index Class Name: Hydrology
• Doc Date: 8/30/2023
• Doc Name: Substitute Water Supply Plan
• From: Division Of Water Resources
• To: DRMS
• Email Name: ECS
• Email Name: MAC
• Media Type: D
• Archive: No

Ready Mix Concrete Company - Supplement to Nix SWSP Renewal Request
August 2, 2023
& TABLES
Table 1.Estimated water consumption from evaporation of exposed groundwater during renewal
period
Evaporation Water Consumption
Monthly
Grass Total Area of
Evaporation Gross Average Effective Net Exposed Total Net
Distribution Evaporation Precipitation Precipitation Evaporation Groundwater Evaporation
Month (%) (in) (in) (in) (in) (ac) (AF)
(1) (2) (3) (4) (5) (6) (7)
Ju12023 15.0% 6.30 1.43 1.00 5.30 10.3 4.55
Aug 2D23 13.5% 5.67 1.39 0.97 4.70 10.7 4.19
Sep 2023 10.0% 4.20 1.36 0.95 3.25 11.1 3.01
Oct 2023 7.0% 2.94 0.58 0.41 2.53 11.5 2.43
Nov 2023 4.0% 1.68 0.16 D.12 1.56 11.9 1.55
Dec 2023 3.0% 1.26 0.05 0.04 1.22 13.6 1.39
Jan 2D24 3.0% 1.26 D.07 0.05 1.21 14.7 1.48
Feb 2024 3.5% 1.47 D.05 0.04 1.43 15.9 1.90
Mar 2024 5.5% 2.31 0.43 0.30 2.01 17.1 2.86
Apr 2D24 9.0% 3.78 1.36 D.95 2.83 18.5 4.36
May2024 12.0% 5.D4 2.02 1.41 3.63 20.5 6.20
Jun 2D24 14.5% 6.09 1.44 1.01 5.08 22.7 9.62
Annual Total 100.0% 42.00 10.35 7.25 34.75 43-52
Notes:
(1)- Annual distribution of gross evaporation for sites under 6,5DD ft msl per DWR guidelines
(2)- Annual gross free water evaporation per NOAA TR NWS 33 multiplied by distribution in(1)
(3)- Average precipitation at NCWCD Gilcrest station from 1994-2020
(4)- Precipitation assumed to be previously consumed by vegetation:(3)*0.7
(5)- Gross evaporation minus effective precipitation:(2)-(4)
(6)- Estimated area of exposed groundwater
(7)- Volume of water consumed due to evaporation of exposed groundwater:(5)/12*(6)
= DINATALE WATER CONSULTANTS 12