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I am working to analyze the impacts of a proposed development within a previous storm water design. I have the report that was prepared for the original design and the report includes the HEC-HMS output results and basins schematic, which shows an upstream pond conveying metered storm water...

So the detention pond would be a regional detention pond?

Understood, and that is what the intent is. The question that I have is specific to the existing drainage basins in the post-development condition. In this case, Basin A and Basin B will be reduced in area due to the proposed residential development. The development's location within the basins...

I apologize for any confusion this post may cause as a result of the questions that I am asking or due to the information that I am presenting, but nonetheless, I appreciate any guidance that can be offered. Two existing drainage basins combine storm water runoff with the hydrologic properties...

Good afternoon, does anyone have a copy of ASCE's current Curves A and B for Estimating Engineering Design Fees as a % of Construction Costs that they can share?

Good morning, I am in search of a detention pond routing spreadsheet template, if anyone has one available or knows where I can download, for a detention pond with multiple outlet configurations that meter the discharge for various return events. I normally utilize Hydraflow Hydrographs and...

I'm working on estimating a composite CN value for a large drainage area with various cover types that include railroad tracks. Does anyone have guidance they can share, or recommend a CN value to use, for railroad tracks? I'm referencing Table 2-2a in TR-55 but there does not seem to be a cover...

Thank you for everyone's responses, they are what I was expecting. The HY-8 software is powerful but limited and I am using Hydrology Studio's Culvert Studio suite to model this system. The 49-degree bend is a horizontal bend with the two 8'x8' barrels on the upstream end and the two 8'x10'...

Good evening, I have three questions regarding culvert modeling in HY-8. I am relatively new to using this software and am unsure if what I am looking to do is possible. I apologize for my naivety in advance. 1. What is the best way to model a culvert system that has two different barrel sizes...

How are detention ponds treated in calculating a "proposed" drainage area's time of concentration? Does the calculation include the length of flow in a pond or are ponds ignored and the calculation ends at the upstream end of a pond?

A site project that I am working on appears to have the pre- and post-developed time of concentration unaffected, either in time or flow path, by a proposed building location and site work. How does one address this scenario? I am worried that I will under-design the detention pond... any...

I cannot find any literature that explicitly does or does not allow detention ponds in floodplains, and if the detention pond can count towards mitigation requirements (no net fill). Does anyone have knowledge on this subject?

I am tasked with determining the fire flow in two proposed hydrants, serving two new facilities, that are connected to an existing water system. I am performing this effort in EPANET 2.0, with which I have intermittent experience with; fire flow modeling is not in that category. I have flow...