2005-03-23_REVISION - M1977424

• Permit No: M1977424
• IBM Index Class Name: Revision
• Doc Date: 3/23/2005
• Doc Name: Submittal
• From: Western Water & Land Inc
• To: DMG
• Type & Sequence: TR5
• Media Type: D
• Archive: No

TABLE OF CONTENTS
1.0 Introduction ........................................................................................................................1
2.0 Peak Discharge Calculation ..............................................................................................1
2.1 Subbasin Areas and Conceptual Stormwater Routing .......................................2
2.2 Time of Concentration ......................................................................................... ..5
2.2.1 Total Flow Time ....................................................................................... ..6
2.3 Rainfall Intensity .................................................................................................. ..8
2.3.1 County Guidance ..................................................................................... ..8
2.3.2 Preparation of IDF Data ........................................................................ ..9
2.3.3 Selection of Design Storm ........................................................................ ..9
2.4 Peak Discharge ..................................................................................................... 10
3.0 Channel Design .................................................................................................................11
4.0 Outlet Design ....................................................................................................................14
5.0 Schedule ....................................................................................................................16
6.0 References ....................................................................................................................16
FIGURES
Figure 1.0 Logan Wash Mine Location Map
Figure 2.0 Logan Wash Mine Stormwater Watershed
Figure 3.0 Schematic Drainage Plan
Figure 4.0 Intensity-Duration-Frequency Curves for Logan Wash Mine
Figure 4.1 Intensity-Duration For 10-Year Storm
PLATES
Plate 1.0 Logan Wash Mine Stormwater Subbasins
Plate 2.0 Logan Wash Mine Stormwater Drainage Plan
ATTACHMENTS
Attachment A Calculations and Tables
Western Water 8 Land Inc. ii