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<br />TABLE OF CONTENTS
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<br />DRAiNAGE CRITERIA MANUAL (V. 1)
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<br />12.0 CLEAN WATER ACT SECTION 404 PERMiTTING PROCESS .............,........_...............,_....,PL-26
<br />12,1 Purpose of the 404 Permil..._.......................................................,-..........................,... PL-26
<br />12.2 Activities Requiring Permit. ....... ..... .............. .....,.......... ...... ..,............ ....,....,..... ,...... ...., PL-26
<br />12.3 Who Should Obtain a Permit........_...............,..................................................,...........PL-26
<br />12.4 Definition of Waters of the United States........................,.......................,.................... PL-26
<br />12.5 Pre-Application Meetings .",... .".. ..,....... .". ..". ..".. .". .'".. .",.. .". ..",..,... .".. .,... .". ..",."... PL-27
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<br />13,0 REFERENCES.. ........... ....,............ ...,... ..,................. ..... .........,........... ...... ......... ........... ..........., PL-28
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<br />Rainfall
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<br />1.0 OVERViEW...........,.. ..................... ........... ,.....,............. ...................... ...... ......... .... ........,....... ..... RA-l
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<br />2.0 RAINFALL DEPTH-DURATiON-FREQUENCY ......................................................................., RA-2
<br />2.1 Rainfall Depth-Duration-Frequency Maps .......................,............................................ RA-2
<br />2,2 Rainfall Depths For Durations Between 1- and 6-Hours ................................,....,........ RA-2
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<br />3.0 DESIGN STORM DISTRIBUTION FOR CUHP..............,..............,..........,................................ RA-3
<br />3.1 Temporal Distribution..............................................,...................................................., RA-3
<br />3.2 Adjustment to Rainfall Distribution for Watershed Size................................,.............., RA-4
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<br />4,0 INTENSITY-DURATION CURVES FOR RATIONAL METHOD ............................._................. RA-6
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<br />5.0 BASIS FOR DESIGN STORM DISTRIBUTION .......................,...........,.................................... RA-7
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<br />6.0 SREADSHEET DESIGN AIDS ............_.......,......................,............,....................,.................... RA-8
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<br />EXAMPLES... .,.. .,. .,.". ..',... ."....... .",... .',.. .."...... .".. .". ..".,.". ."... .". .,."... .,.. .',.,. .,'. ..,.., .". ..,.. .". .,. RA-9
<br />7,1 Example Computation of Point Rainfall....................................................................,... RA-9
<br />7.2 Example Distribution of Point Rainfall .......................................................................... RA-9
<br />7.3 Example Preparation of intensity-Duration-Frequency Curve................,................... RA-lO
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<br />8,0 REFERENCES..... ........... .......... .....,..........,..".....,.....,.......................... .......... .....,.........,......... RA-12
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<br />7,0
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<br />Runoff
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<br />1.0 OVERViEW.................................,..................................,.............,.....................,..............,.....,.. RO-l
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<br />2,0 RATIONAL METHOD. ....,.................,..... _........,..... _....,................... ....,.. ......... ...... ..........,.......... RO-3
<br />2,1 Rational Formula .......................,.....................,....................................,....,...............,..RO-3
<br />2.2 Assumptions .......................... ........... .......... ..,.. ...................... ..,.. .............. .......... .......... RO-4
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<br />2.3 Limitations",.. .".,.',....,.. .,_.. ..",. ...,... .". .,.... .". ..',.,.". ."... .".,. .".. .',.. .".,.','.. .,. ..". .'-" ."... .,. RO-4
<br />2.4 Time of Concentration _................................................................................................_RO-5
<br />2.4,1 Initial Fiow Time........__...,......,.....,...................,.......,....__......................,__........' RO-5
<br />2.4.2 Overland Travel Time ...._.......,.....,.......,..__..............,.........,....__................'....... RO-6
<br />2.4,3 First Design Point Time of Concentration............._.........,.........,..................._.. RO-6
<br />2.4.4 Minimum Time of Concentratlon.._.,................................................................. RO-7
<br />2,4,5 Common Errors in Calculating Time of Concentration ....,........__....__............... RO-7
<br />2.5 Intensity..,.....,...... __........ __.... .....,................... ..,.. .... .................. __........ --.. ..... ....... --,......... RO-7
<br />2.6 Watershed Imperviousness........ ___.............................., .... ......,..... __.... --... __.., ....,.... --.., -, RO-7
<br />2.7 Runoff Coefficient .........,. ...............,..,. .......... ............................ ...................,....,. -.,. ....., RO-8
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<br />COLORADO URBAN HYDROGRAPH PROCEDURE ..,....................,..................._.............,RO-19
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<br />3.1 Background.. .._." .......... _...,......,... _, _............_.....,..........................'.' .....,....,...-,.... ....,... RO-19
<br />3.2 Effective Rainfall for CUHP....,....._.......,.........................,..........,....--...........--, ,..,.....,. RO-19
<br />3,2.1 Pervious-Impervious Areas .......,_._..,....,..__....,.......,_........._.........___......'......... RO-19
<br />3.2.2 Depression Losses ,.....,..........__..........._....,.....,....,......._.........._.'..........,..,.-,.. RO-20
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<br />3.0
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<br />TOC-vi
<br />Urban Drainage and Flood Control District
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<br />6/2001
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